CONTENTS OF THIS SECTION
Figure Index
General Description
Body Lubrication
Service Operations and Adjustments
Assembly Manual
Figure Index
Fig. 1 - Vacuum Type Windshield Wiper Motor
Fig. 2 - Transmission Cable Installation
Fig. 3 - 1957 Electric Windshield Wiper
Fig. 4 - Switch Section of Wiper
Fig. 5 - Drive and Oscillating Section of Wiper
Fig. 6 - Oscillating Parts at Start of Park Cycle
Fig. 7 - Oscillating parts at Completion of Park Cycle
Fig. 8 - Park Position Circuit Diagram
Fig. 9 - Low Speed Circuit Diagram
Fig. 10 - High Speed Circuit Diagram
Fig. 11 - Breaker Arm-to-Cam Guide Clearance
Fig. 12 - Oscillating Parts - Exploded
Fig. 13 - Assembly of Drive Assembly Disc, Spring, and Pawl
Fig. 14 - Assembly of Yoke, Cam and Pin, and Drive Disc
Fig. 15 - Wiper Motor - Exploded View
Fig. 16 - Retaining Brushes with Improvised Separator
Fig. 17 - Holding Brushes with Brush Retainer Spring 5096576
Fig. 18 - Motor Case Electrical Connections
Fig. 19 - Installing Brushes in Holders
Fig. 20 - Cowl Side Drain Gutter
Fig. 21 - Instrument Panel Cover
Fig. 22 - Windshield Reveal Moldings
Fig. 23 - Convertible Reveal Moldings
Fig. 24 - Sealing Windshield Reveal Moldings
Fig. 25 - Windshield Garnish Moldings
Fig. 26 - Windshield Reveal Moldings
Fig. 27 - Reveal Molding Clips
Fig. 28 - Loosening Windshield Channel
Fig. 29 - Windshield Body Opening Check
Fig. 30 - Windshield to Body Clearance
Fig. 31 - Windshield Drain Gutter
Fig. 32 - Convertible Reveal Molding Cutout
Fig. 33 - Cord in Pinchweld Cavity
Fig. 34 - Installing Lip of Rubber
Fig. 35 - Instrument Panel Compartment
Fig. 36 - Rear View Mirror and Bracket ( Sport Sedan)
Fig. 37 - Sedan Door Inner Panel
Fig. 38 - Sedan Door Electric Lift Inner Panel
Fig. 39 - Electric Lift Master Switch
Fig. 40 - Door Window
Fig. 41 - Door Window Adjustment
Fig. 42 - Door Window Regulator
Fig. 43 - Door Weatherstrip Installation
Fig. 44 - Front Door Weatherstrip Location
Fig. 45 - Rear Door Weatherstrip Location
Fig. 46 - Sealing Front and Rear Door Weatherstrip
Fig. 47 - Front Door Water Deflector
Fig. 48 - Front Door Hinge Pillar Weatherstrip
Fig. 49 - Rotary Lock Parts
Fig. 50 - Rotary Lock Parts
Fig. 51 - Door Lock Remote Control
Fig. 52 - Caulking Lock Frame
Fig. 53 - Checking Adjustment of Door Lock Striker
Fig. 54 - Front Door Hinge
Fig. 55 - Hinge Sealing
Fig. 56 - Door Inner Panel Sealing
Fig. 57 - Door to Pillar Clearances
Fig. 58 - Body Mounting Bolts
Fig. 59 - Ventilator Regulator
Fig. 60 - Ventilator Adjustment
Fig. 61 - Ventilator Removal
Fig. 62 - Door Outside Handle Attachment
Fig. 63 - Door Handle Exploded
Fig. 64 - Door Lock Cylinder
Fig. 65 - Door Lock Cylinder Exploded
Fig. 66 - Door Lock Spring Clip
Fig. 67 - Rear Door Inner Panel
Fig. 68 - Rear Door Electric Lift Inner Panel
Fig. 69 - Rear Door Hinge Sealing
Fig. 70 - Rear Door Hinge Plate Sealing
Fig. 71 - Rear Door Lock and Remote Control
Fig. 72 - Adjusting Lock to Free-Wheeling
Fig. 73 - Free-Wheeling Control Rod
Fig. 74 - Rear Door Assembly
Fig. 75 - Rear Door Assembly - Standard Sedan
Fig. 76 - Rear Door Inner Panel Sealing - Standard Sedan
Fig. 77 - Side Roof Rail Sealing - Sport Sedan
Fig. 78 - Side Roof Rail Weatherstrip Adjustments
Fig. 79 - Front Door Inner Panel Sealing - Sport Sedan
Fig. 80 - Sealing Door Ventilator Cap Finishing Molding
Fig. 81 - Front Door Window Removal - Sport Sedan
Fig. 82 - Door Lock Removal - Front Door
Fig. 83 - Door Lock Remote Control
Fig. 84 - Front Door Lock Cylinder
Fig. 85 - Front Door Outside Handle
Fig. 86 - Rear Door Assembly and Hinges
Fig. 87 - Sealing Door Hinge
Fig. 88 - Rear Door Inner Panel Sealing - Sport Sedan
Fig. 89 - Door Lock Removal - Rear Door
Fig. 90 - Rear Door Outside Handle
Fig. 91 - Door Lock Connector Assembly
Fig. 92 - Rear Door Window and Regulator - Electric
Fig. 93 - Rear Door Window and Regulator - Manual
Fig. 94 - Rear Door Window Removal
Fig. 95 - Rear Door Window Adjustments
Fig. 96 - Rear Door Window Regulator Removal - Electric
Fig. 97 - Rear Door Window Regulator Removal - Manual
Fig. 98 - Rear Door Window Regulator Electric Motor Assembly
Fig. 99 - Rear Door Weatherstrips - Sport Sedan
Fig. 100 - Convertible Door Inner Panel
Fig. 101- Convertible Door Electric Lift Inner Panel
Fig. 102 - Convertible and Sport Coupe Door Weatherstrip
Fig. 103 - Convertible Regulator
Fig. 104 - Convertible Door Window
Fig. 105 - Mechanical Sealing Strip
Fig. 106 - Sealing Mechanical Sealing Strip
Fig. 107- Convertible Door Inner Panel Sealing
Fig. 108 - Nomad Side Roof Rail Weatherstrip
Fig. 109 - Back Window Assembly - Standard Sedan
Fig. 110 - Back Window Reveal Mouldings - Standard Sedan
Fig. 111 - Back Window Assembly - Sport Sedan
Fig. 112 - Back Window Reveal Moldings - Sport Sedan
Fig. 113 - Removing Reveal Molding
Fig. 114 - Installation of Reveal Moldings
Fig. 115 - Torsion Rods Cover
Fig. 116 - Disengaging Torsion Rod
Fig. 117 - Torsion Rod Adjusting Positions
Fig. 118 - Rear Compartment Lid Lock
Fig. 119 - Rear Compartment Weatherstrip
Fig. 120 - Rear Compartment Lid Hinge Shimming
Fig. 121 - Rear Compartment Bolt and Striker Check
Fig. 122 - Rear Compartment Lid Clearances
Fig. 123 - Back Window Gutter Drain
Fig. 124 - Rear Quarter Window Sport Coupe
Fig. 125 - Rear Quarter Window Adjustments
Fig. 126 - Rear Quarter Window Electric Regulator
Fig. 127 - Rear Quarter Window Guides
Fig. 128 - Convertible Rear Quarter Window
Fig. 129 - Rear Quarter Window Electric Window Regulator
Fig. 130 - Rear Quarter Trim - 4 Door Station Wagon
Fig. 131 - Rear Quarter Window Installation - 4 Door
Fig. 132 - Rear Quarter Trim - 2 Door Station Wagon
Fig. 133 - Rear Quarter Window Installation - 2 Door Station Wagon
Fig. 134 - Inside Side Panel Moldings - Sedan Delivery
Fig. 135 - Rear Quarter Inner Panel Sealing - All Styles
Fig. 136 - Tail Gate Assembly Removal
Fig. 137 - Sealing Tail Gate Hinge Strap
Fig. 138 - Sealing Tail Gate Hinge
Fig. 139 - Removing Tail Gate Outside Handle
Fig. 140 - Tail Gate Lock Striker
Fig. 141 - Tail Gate Outside Handle - Nomad
Fig. 142 - Tail Gate Lock Remote and Push Button Control Assembly - Nomad
Fig. 143 - Tail Gate Lock Push Button - Exploded - Nomad
Fig. 144 - Tail Gate and Lift Gate Weatherstrips
Fig. 145 - Lift Gate Assembly Hinges
Fig. 146 - Lift Gate Window
Fig. 147 - Lift Gate Supports
Fig. 148 - Lift Gate Assembly
Fig. 149 - Lift Gate Adjustments
Fig. 150 - Lift Gate Hinge
Fig. 151 - Lift Gate Window Installed
Fig. 152 - Lift Gate Weatherstrips
Fig. 153 - Back Door Assembly - Sedan Delivery
Fig. 154 - Front Seat Construction
Fig. 155 - Front Seat Side Panels - All Styles
Fig. 156 - Front Seat Regulator Switch
Fig. 157 - Front Seat Electric Regulator
Fig. 158 - Seat Adjuster Tensioner Spring
Fig. 159 - Tilting Seat Back Removal
Fig. 160 - Seat Solid Back Removal
Fig. 161 - Seat Adjuster Assembly- Sedan Delivery
Fig. 162 - Folding Seat Assembly - 6 Passenger Station Wagon
Fig. 163 - Right Center Folding Seat Assembly- 9 Passenger Station Wagon
Fig. 164 - Floor Board Supports
Fig. 165 - Maximum Floor Space
Fig. 166 - Left Center Folding Seat Assembly
Fig. 167 - Rear Seat Assembly
Fig. 168 - Headlining Retainer and Trim Stick
Fig. 169 - Headlining Installation
Fig. 170 - Headlining - Standard Sedan and Sport
Fig. 171 - Headlining - Station Wagon
Fig. 172 - Headlining - Nomad
Fig. 173 - Exterior Moldings - 1500 Series Utility Sedan
Fig. 174 - Exterior Moldings - 1500 Series Four-Door Sedan
Fig. 175 - Exterior Moldings - 2400 Series Two-Door Sedan
Fig. 176 - Exterior Moldings - 2400 Series Four Door Sedan
Fig. 177 - Exterior Moldings - 2400 Series Sport Sedan
Fig. 178 - Exterior Moldings - 2400 Series Nomad
Fig. 179 - Sealing Rear Quarter Window Exterior Moldings
Fig. 180 - Exterior Moldings - 2400 Series Convertible
Fig. 181 - Socket and Blade-Type Connectors
Fig. 182 - Electric Window Regulator
Fig. 183 - Power Window Wiring Installation
Fig. 184 - Checking Door Switch
Fig. 185 - Checking Door Switch
Fig. 186 - Checking Switch to Motor Leads
Fig. 187 - Checking Motor Operation
Fig. 188 - Side Roof Rail Weatherstrip
Fig. 189 - Front Roof Rail Corner Brace
Fig. 190 - Sunshade Support and Handle Striker
Fig. 191 - Top Linkage Adjusting Points
Fig. 192 - Rotor Type Pump Installed Behind Rear
Fig. 193 - Motor and Pump Assembly - Exploded
Fig. 194 - Motor and Pump Assembly - Removal
Fig. 195 - Adaptor Hose
Fig. 196 - Disassembly of Reservoir Tube
Fig. 197 - Pump Action When Raising Top
Fig. 198 - Pump Action When Lowering Top
Fig. 199 - Fluid Flow Between Rotor and Reservoir
Fig. 200 - Position of Rocker Arm When Raising Top
Fig. 201 - Position of Rocker Arm When Lowering Top
Fig. 202 - Fluid Level in Reservoir
Fig. 203 - Checking Pump Pressure
Fig. 204 - Slide Bar Lock
Fig. 205 - Tumbler Requirement Diagram
Fig. 206 - Inserting Tumblers
Fig. 207 - Checking With Code
Fig. 208 - Inserting Tumbler Springs
Fig. 209 - Inserting Spring Retainer
Fig. 210 - Convertible Wiring
Fig. 211 - Four Door Sedan Wiring Diagram
Fig. 212 - Sport Coupe Wiring Diagram
Fig. 213 - Two Door Sedan Wiring Diagram
Fig. 214 - Sport Sedan Wiring Diagram
Fig. 215 - Body Tools
General Description
The 1957 bodies, while basically the same as in 1955, incorporate many changes and additions. This section is not supplementary to 1955 or 1956 but is complete in itself. Service and procedures are covered on all 1957 styles.
Movable parts of the body are lubricated at the factory insuring proper operation. Those body parts which have frequent use, such as door locks etc., should be lubricated twice a year. Other body parts should be lubricated when access is available.
The following parts should be lubricated twice a year.
Wipe off all lubrication points before applying new lubricant.
Remove all excess lubricant to prevent staining of trim parts.
Lubrication Points
Lubricant
Instrument Compartment Door Hinge
Dripless Oil
Front Door Hold Open Clips
Lubriplate or Equivalent
Door Jamb Light Switch
Lubriplate or Equivalent
Door Lock Bolt Housing
Stick Type Lubricant
Door Lock Striker Teeth
Stick Type Lubricant
Rear Door Hinge and Hold Open
Lubriplate or Equivalent
Deck Lid Hinge and Torque Rod Ends
Lubriplate or Equivalent
Deck Lid Lock Bolt
Lubriplate or Equivalent
Gas Filler Door Hinge
Dripless Oil
Folding Top Linkage Bearing Points
No. 10 Engine Oil
Side Roof Rail Mechanical Sealing Strip (Gasket Parts to be
lubricated when access to parts can be obtained.)
Silicone Emulsion
Windshield Wiper Motor and Transmission Spools
Lubriplate or equivalent
Door Lock Parts
Lubriplate or equivalent
Window Regulator Rack and Cam Channels
Lubriplate or equivalent
Cowl Assembly
Instrument panel compartment
Door Assembly
Rear End Assembly
Trim Assemblies
Electric Window Assembly
Electrical Unit Checks
Hydro-Lectric System
Keys and Locks
Care of Trim
Cowl Assembly
Vacuum Windshield Wiper Assembly
Electric Windshield Wiper Assembly
Cowl Ventilating System
Windshield Assembly-All Styles
Vacuum Windshield Wiper Assembly
The windshield wiper assembly consists of a motor, auxiliary drive and two transmissions. The standard motor is vacuum operated and the optional motor is electrically powered. Both motors are interchangeable. The transmission incorporates spring loaded pulleys which provide for adjustment of the wiper cable tension. The wiper motor auxiliary drive incorporates two drums to which transmission drive cables are attached. The wiper motor and auxiliary drive assembly is installed to engine side of the dash panel. The motor and auxiliary assembly may be removed as a unit or the motor may be removed separately.
Adjustment
The windshield wiper transmission drive cables are tensioned by spring loaded pulleys. The end of the transmission shaft is pushed in to unlock the pulleys. To tension cables push in on transmission shaft end if blade has been removed or on the base of the wiper arm if the, blade is installed.
To release cable tension for removal of components push in on transmission shaft end and have helper on the inside, pull on cables to obtain desired slack then release pressure on transmission shaft.
NOTE: Wiper blade snap or over-travel is indicative of loose transmission drive cables.
Removal
Installation
The attachment of the windshield wiper transmission is the same as on past styles with the exception of an additional support and attaching nuts which secure the transmission to the underside of the upper shroud.
Removal
Installation
Removal and Installation
The electric windshield wiper (Fig. 3) used on the 1957 Chevrolet is a 12-volt DC unit powered by an internally grounded motor containing both a series and shunt field. The armature of the motor is fitted with a worm shaft which drives the oscillating mechanism through a nylon gear.
A leaf contact-type switch enclosed within the motor housing controls the motor and has three positions; high speed, low speed, and a park, or off position. This switch is controlled by means of a nylon slider mounted externally over the switch on the motor housing which in turn is operated by a bowden cable from the dash panel.
To protect the motor from damage due to overheating, a thermal circuit breaker is built into the case at the commutator end of the motor.
Basically, the electric windshield wiper consists of the cast motor housing, electric motor, the switch mechanism, and the oscillating drive mechanism. A stamped steel case mounts the thermal circuit breaker and motor brushes and completes the encasement of the motor. Individual stamped covers are used over both the switch and oscillating drive recesses in the motor housing. The auxiliary drive mounting bracket which attaches the wiper unit to the dash panel is permanently fastened to the oscillating section cover. An oscillating drive arm is pressed onto the oscillating shaft in a fixed position and should not be removed in service.
With the unit operating, moving the wiper control on the instrument panel to the off, or park, position moves the nylon slider on the switch cover which moves the latch assembly switch arm (fig. 4) in the switch housing. The latch assembly switch arm is attached to the shaft of the latch assembly toggle (fig. 5), therefore switch arm movement results in like action by the latch toggle. As the spring-loaded latch assembly toggle snaps away from the oscillating drive mechanism, the latch assembly arm (fig. 5) reacts in the opposite direction, thus placing the arm in the path of the clockwise rotating drive assembly disc (fig. 5). After the latch arm contacts the ear of the drive assembly disc as shown in figure 6, the rest of the drive assembly continues to turn, tightening a spring attached to both the nylon gear (fig. 5) and the drive assembly disc. This build-up of spring tension forces the drive pin (fig. 7) to move toward the outer radius of the yoke in the drive assembly, thus increasing the arc-of-travel of the connecting rod (fig. 5). By this means, the additional angular travel required to bring the wiper blades to rest against the cowl molding is provided.
Attached to the opposite end of the oscillating shaft in the switch portion of the motor housing is the breaker arm (fig. 4). During operation of the wiper, the breaker arm oscillates freely inside the switch casting. However, once the drive pin arc-of-travel is increased as described above and as illustrated in figure 7, the oscillation range of the breaker arm (fig. 4) is altered causing the arm to hit the fiber cam and trip the contacts. This action trips contact No. 4 (fig. 4), moving it away from contact No. 3 which breaks the ground and moves No. 4 into contact No. 5 which results in a momentary short being thrown across the armature. This operation provides a dual purpose: First, the separating of contacts No. 3 and 4 breaks the circuit to the motor and finally, the closing of contacts No. 4 and 5 shorts the armature thus providing considerable braking action to overcome any coasting action of the motor when shut down. Figure 8 provides an electrical diagram of the unit with the switch contacts in their park relationship.
Moving the switch slider (fig. 3) by means of the control located on the dash into slow speed, or the first operating position, trips the latch assembly toggle (fig. 5), knocking the latch assembly arm clear of the ear of drive assembly disc.
This releases the spring tension built up as the unit went into park, snapping the drive pin back to its original position in the yoke as shown in figure 6. By this means, the usual wiper pattern of the blade arms is re-established.
At the same time that the latch assembly toggle releases the spring tension in the drive and oscillating portion, the movement of the switch slider causes contact Nos. 1 and 2 to close and Nos. 3 and 4 to close, thus forming the wiper low speed circuit 9 .
In low speed and following the diagram shown in Fig. 9, contact Nos. 1 and 2 are closed and Nos. 3 and 4 are closed. From source, the current passes the circuit breaker and energizes the series field. After passing through the series field, the power is divided; part is directed to the armature and the remainder is eliminated by being diverted to ground through the shunt field, through contacts No. 1 and 2, then to contact No. 4, and finally to contact No. 3 which is grounded. In following this path, it is well to remember that current always follows the path of least resistance, therefore in low speed, no current passes through the resistor because of the more direct path to ground.
The major point to remember concerning low speed operation is that only about one-half of the power is used to drive the motor; the remainder is diverted to ground.
Moving the wiper control on the dash panel further closes the high speed circuit (fig. 10A). For high speed operation, all contacts are open with the exception of Nos. 3 and 4 which produces the following electric flow: From the source, current flows through the circuit breaker and energizes the series field as in low speed operation. Upon leaving the series field, the current once again divides; half going directly to the armature and the remainder through the shunt field. However, with only contacts No. 3 and 4 closed, the current is forced to flow through the resistor to reach ground via the jumper to No. 4 and finally to No. 3 contact and ground. By forcing the current through the resistor, the flow through the shunt field is slowed considerably, consequently more current is forced to flow through the armature to reach ground and the motor speed is increased proportionately.
Three adjustments are required for proper functioning of the electric windshield wiper; armature and end-play adjustment, drive assembly end-play adjustment, and switch adjustment. Of these, both end-play adjustments would usually be performed either during or after complete overhaul of the unit. Drive assembly end-play is accomplished during rebuild of the unit whereas the armature end-play adjustment is made after reinstalling the wiper on the car. Loss of or incorrect switch adjustment accounts for the majority of wiper complaints, therefore it is with this adjustment that the serviceman should be most critical.
It is possible that adjustments within the switch compartment could be made with the wiper installed on car, however, due to the general inaccessibility of the wiper and its ease of removal, it is recommended that the unit be removed so that all service procedures may be made on the bench.
Adjustment
NOTE: Although seldom necessary, the breaker arm (fig. 4) may be bent toward the fiber cam if the unit cannot be stopped after shifting the switch its full limit. When the breaker arm is stopped at its park position, the minimum clearance between the arm and cam guide should be 1/32" (fig. 11).
Adjustment
Adjustment
Drive assembly end-play should be established within .005"-.008" during assembly through use of end-play washers beneath the snap ring on the portion of drive assembly shaft shown at the bottom center of figure 4.
As mentioned earlier, complete tear-down of the wiper assembly is seldom required as the majority of its malfunctions occur within the external controls to the wiper or within the switch housing.
The overhaul procedures are broken down into three major areas: switch assembly, oscillating and drive assembly, and motor. Both the switch and motor assemblies can be serviced without disturbing other sections of the wiper but to disassemble and assemble to the oscillating and drive portion it is also necessary to remove certain elements from the switch housing. Because of the general independence of each section of the wiper, complete disassembly, inspection, and assembly instructions are provided under the wiper component headings.
Disassembly
CAUTION: Do not remove latch assembly switch arm (fig. 4).
Cleaning and Inspection
Check all switch contacts for foreign matter or possible deformation. Contacts can be cleaned with a cloth dampened with carbon tetrachloride or small imperfections removed with emery paper. Broken contacts require replacement of the switch as an assembly.
Be especially careful to check that there is no foreign matter bridging the insulators at the base of the switch. Should any insulator be broken or oil soaked, these can be replaced by removing the two screws holding the contacts and insulators and replacing the insulators with like thicknesses of tag board or non-conducting gasket material.
Check that breaker arm fiber contact surface is in good condition.
Installation
NOTE: If work is necessary within the oscillating and drive section, delay reassembly of the switch components until that work is completed.
Disassembly
NOTE: Further disassembly of the cover and linkage should not be attempted as these parts are furnished only as assemblies for service. No attempt should be made to remove the latch assembly toggle or arm (fig. 4) as these are fixed fast in the housing. If necessary, the latch spring (fig. 4) can be changed with the toggle installed.
Cleaning and Inspection
Clean all parts except the nylon gear with cleaning solvent and air-dry. Check all parts for deformations and repair or replace as necessary.
The nylon drive gear should be checked for worn or broken teeth. If either condition is present, replace the gear.
Clean the cover and connecting rod linkage of all old lubricant and check for bent parts. Replace the cover and linkage if any faults are found.
Assembly
Disassembly
The motor may be serviced without disturbing other sections of the wiper.
NOTE: All number references are to fig. 15.
Cleaning and Inspection
NOTE: All number references are to fig. 15.
CAUTION: Disconnect unit from source of power before removing switch cover.
Trouble
Possible Causes
Remedies
A. Unit will not turn on.
1. No supply voltage at wiper unit.
1. Check wiring carefully.
2. Unit improperly grounded.
2. The wiper unit ground strap should be placed under one of the
auxiliary drive mounting screws.
3. Defective soldering at switch terminals.
3. Resolder switch connections if necessary.
4. Defective motor-open field, brushes sticking.
4. Repair defective motor.
5. Contacts 3 and 4 not making contact when unit is turned on or
contacts 3 and 4 dirty.
5. Bend contact 3 slightly so that it will make contact with contact
No. 4. (Be sure switch is in the low or high speed position when doing
this.)
6. Circuit breaker contacts dirty, defective circuit breaker.
6. Remove case and brush assembly and check circuit breaker
contacts.
B. Unit will not shut off.
1. Failure of oscillating arm to trip contact 3 and 4 (fig. 4).
1. Adjust switch as follows:
a. Loosen switch assembly
mounting screws.
b. Move switch toward oscillating arm and
tighten mounting screws.
c. Test for slow, fast and park
positions.
d. If proper adjustments cannot be obtained through
steps a, b, and c, replace switch assembly.
2. Poor fit between oscillating arm and oscillating shaft slot which
would allow excessive circular play of the oscillating switch arm.
2. Replace oscillating switch arm, or try staking it in position.
3. Jumper between contacts 2 and 4 (
fig. 8) shorting to ground.
3. If impossible to remove shorted condition, replace switch
assembly.
C. Slow speed operation in both slow and fast switch
positions.
1. Switch breaker arm which is operated by the external switch slide
not opening contacts 1 and 2 (fig. 4).
1. Adjust as follows:
a. Loosen switch assembly mounting
screws.
b. Move switch assembly toward motor section of wiper
unit and tighten mounting screws.
c. Test for slow, fast and
park positions.
d. If proper adjustment
cannot be
obtained by steps a, b, and c, replace switch assembly.
2. Short between switch cover and switch assembly.
2. Caused by switch assembly resistor touching switch cover. Bend
the resistor down so that it will
clear the cover.
3. Switch fiber cam not seated properly in slot and therefore, fails
to open contacts 1 and 2.
3. Position the fiber cam in the slot and check for proper
functioning.
D. Normal fast operation in both the slow and fast speed
positions.
1. Speed control contacts No. 1 and 2 (fig. 4) not making contact at low speed position (resistor is in
circuit in both slow and fast switch positions).
1. Check for dirty contacts and clean if necessary. If contacts 1
and 2 appear to be separated in the low speed switch position, it may be
possible to bend contact No. 1 slightly so that it will make contact
with contact No. 2. If the above repairs fail to correct this
condition, replace the switch assembly.
E. Excessive speed in high speed positions, slow speed OK.
1. Switch assembly resistor open.
1. Replace switch assembly.
F. Excessive speed in both low and high speed positions.
1. Defective soldering of the black shunt field lead to the switch
assembly.
1. Resolder black field lead to switch.
2. Open shunt field.
2. Replace entire motor unit.
Ventilating System
Description
The 1957 Chevrolet incorporates a new ventilating system with air intakes at the forward end of the car. The air flows through air ducts and into the body through openings in each side of the dash panel. The flow of air is regulated by the same type controls used on past styles.
Removal and Installation
A cowl side drain gutter is located on the right and left cowl side panel adjacent to the door opening as shown in fig. 20.
The instrument panel cover of plastic construction is serviced as a one-piece unit. In Service the cover is secured to the instrument panel by 3M Super Weatherstrip Adhesive (Neoprene) or equivalent around the perimeter of the cover and by metal retainers along the rear edge of the cover.
Removal
Installation
The weatherstrip is located along the upper portion of the front body hinge pillar and is secured in place by four snap-in clips which are formed from a wire insert.
Removal and Installation
Carefully position tip of mechanically retained weatherstrip inserting tool or other suitable tool under weatherstrip at each clip location and snap clip out of the hole. To install weatherstrip, reverse the removal procedure.
The 1957 Chevrolet incorporates a large one piece windshield which is retained in the windshield opening by a one-piece rubber channel.
The sedan, sport sedan and sport coupe styles have reveal moldings of the same design. The convertible style takes a different windshield upper and side reveal molding, as shown in illustrations Fig. 22 Windshield Reveal Moldings and Fig. 23-Convertible Reveal Moldings.
Removal
NOTE: On all styles, the upper reveal molding(s) can only be removed from the windshield rubber channel after the windshield is removed from the body.
Installation
Removal and Installation
Removal and Installation
Removal and Installation
Remove the windshield side garnish and side reveal moldings, the finishing molding is retained by its flanges which fit under the garnish and reveal moldings. To install, reverse the removal procedure.
Removal and Installation
When a cracked windshield glass is to be removed and there is an indication of a strain break, mark the location of the break on the windshield rubber channel and the body.
Removal
Body Windshield Opening Check
Due to the expanse and contour of the windshield it is imperative in the event of a strain break that the windshield opening be thoroughly checked before installing a replacement windshield. The replacement glass is used as a template for checking the windshield opening.
Installation
Removal and Installation
Adjustment
To reposition compartment door up or down in its opening, loosen hinge attaching screws at the door inner panel and shift in the desired direction.
To reposition the door laterally, loosen hinge attaching screws at instrument panel flange and shift door in the desired direction.
The door lock striker may be adjusted by loosening the attaching screws and moving the striker either in or out.
Removal and Installation
Removal and Installation
The rear view mirror and support ( fig. 36) is located at the lower center area of the windshield opening and is secured to the instrument panel by two (2) nut and washer assemblies.
Removal and Installation
Sedan and Station Wagon Front Door Assembly
Sedan and Station Wagon Rear Door Assembly
Sport Sedan Door Assembly
Convertible and Sport Coupe Door Assembly
Nomad Station Wagon Front Door Assembly
Sedan and Station Wagon Front Door Assembly
Figures fig. 37 and fig. 38 are the sedan front door assemblies with trim pads removed, showing various door component attaching and adjusting points.
Removal and Installation
Removal and Installation
Removal and Installation
Removal and Installation
Removal and Installation
NOTE: On all styles except the Sport Sedan, the feed stud of the master control switch should point toward front of car. On Sport Sedan styles, the stud should point toward rear of car. Check switch operation before completing installation.
Front door window is removed and installed in a similar manner for both manually and electrically operated windows.
Removal and Installation
Adjustment
Removal and Installation
Removal and Installation
The door weatherstrip is a one piece mechanically retained type. The weatherstrip is also cemented across the bottom and up a short distance on each pillar. An auxiliary weatherstrip is provided on front doors at the hinge pillar to direct water from the offset area of the hinge pillar through drainage hole in the door pillar. This weatherstrip is cemented to the door hinge pillar and has two snap clips at the lower portion. At the bottom of the door, the drain holes are covered by rubber sealing strips. Service procedures for front and rear door weatherstrips are similar and both weatherstrips are covered herein.
NOTE: Some door weatherstrips are retained entirely by weatherstrip adhesive and a metal retainer at the lower edge of the door. The installation and removal procedures for this type of weatherstrip is the same as used in previous years.
Removal
Installation
Service replacement weatherstrips are longer than necessary to insure a satisfactory joint. Do not cut weatherstrip until all clips are installed into retaining holes. Install weatherstrip clips into clip holes along sides and top of doors after positioning weatherstrip as follows:
A door water deflector, consisting of waterproof paper secured to the door inner panel by elastic double sided sealing tape, is provided on front doors. The deflector covers the complete door inner panel and fits into a slot along the bottom of the door inner panel. This deflects water into the bottom of the door where it can drain out the door bottom drain holes. When work is performed on a door where the water deflector has been disturbed, the deflector must be properly sealed and attached to the inner panel as specified below. When loosening or removing a door water deflector, the seal between the double sided sealing tape and water deflector should not be broken.
Removal
Installation
Removal
Installation
These service operations may be used for door locks on all models. However, in addition to the following operations, it is necessary to remove the door window and glass run channel, to remove the door lock from sport coupes, sport sedans and convertibles.
Operation
A rotary bolt type door lock is used on all models. Figuresfig. 49 and fig. 50 show the door lock construction and striker with the names of component parts. When the door is being closed, the lock bolt rotates as it comes in contact with the striker, until it becomes firmly engaged with the teeth at the lower end of the striker. When the door is completely closed, the locking cam, shown in the illustration, is firmly locked by the detent lever (fig. 49). To open the door, the locking cam is released so that the bolt can rotate. This action is obtained by the operation of the push button or remote control handle.
Locking of the door by key or by the lock rod is accomplished in the lock in the following manner.
Removal and Installation
Removal and Installation
NOTE: Before installing door lock, apply a ribbon of caulking compound across the face of the lock frame approximately 3/4' above the rotary bolt housing as shown at "I" (see fig. 52).
Front and rear door lock strikers incorporate the inter-lock feature consisting of a notch in the striker into which the lock bolt housing extension engages. With the inter-lock feature it is very important that the lock extension engages properly in the striker notch and that, where necessary, the correct striker emergency spacers are used to obtain proper engagement.
Removal and Installation
IMPORTANT: Whenever a door has been removed and installed, or realigned, the door SHOULD NOT be closed completely until a visual check is made to determine If the lock extension will engage in the striker notch. Where required, door lock striker emergency spacers should be installed so that door can be closed and an accurate check made to determine emergency spacer requirements.
Adjustments
When dimension "A" from inside face of striker teeth to center of lock extension is less than 3/16", install emergency spacers and proper length striker attaching screws as directed on next page.
NOTE: Dimension "B" from center of lock extension to inside face of striker notch should never be less than 1/8".
Dimension"A" No. Spacers Required Spacer Thickness Striker Attaching
Screws*
3/16" to 1/8" 1 1/16" Original Screw
1/8" to 1/16" 1 1/8" Emergency Screw-
(1/8" longer)
1/16" to 0 1-(1/8 Spacer) 3/16" (Total) Emergency Screw-
(1/8" longer)
0 to 1/16" 2-(1/8" Spacers) 1/4" (Total) Emergency Screw- Interference (1/4" longer)
*Zinc or cadmium-plated flat head cross recess screw with countersunk washer.
The front door may be removed with or without the hinges attached.
Removal
Installation
Some of the front door inner panel weatherseals have been changed for 1957 styles. These changes are covered 'below. Whenever work is performed on a door where any of the door inner panel weatherseals have been disturbed, the area must be resealed before the door trim assembly is reinstalled.
Figure 56 shows door inner panel openings which are sealed to prevent water leakage and possible damage to the door trim assembly.
All window regulator attaching holes (4).
Door inner panel cam attaching
holes (5).
Ventilator division channel lower attaching stud
and nut (6).
Ventilator tee-shaft access hole and ventilator
regulator attaching screws. (7, View "A.")
Door trim assembly nail slots (8).
On electric styles-inner flanges of switch hole
cover and to upper rear corners and
across top
joint of cover and inner panel. (9, View "B.")
Door arm rest attaching holes (10).
Cam access hole (11).
Lock access hole (12).
Lower hinge access hole (13).
Upper hinge access hole (14).
On electric styles-window regulator spindle hole
(15).
Door adjustment is provided at the hinges through the use of cage nuts and anchor plates. When checking a door for misalignment, remove the door lock striker and allow the door to hang free on its hinges, then check the spacing at the sides and top of the door. After determining the type of correction needed, correct in the following manner:
Up or Down and In or Out
Up or Down and Fore or Aft
Should the door clearance at the body hinge and windshield pillars be parallel and fall within 1/16" to 3/16" clearances and the door at the center or lock pillar be tilted (close at the top, wide at the bottom or vice-versa) it is indicative of another type of correction, namely body shimming. In most cases, where adjustment of the doors cannot correct a door alignment problem, body shimming will be the answer. Figure 58 shows the location of all body mounting points and where shims may be added or removed to correct body alignment faults. In addition figure 57 gives the dimensional clearances of the doors at the pillars.
NOTE: After performing any door adjustments on a convertible or four-door sedan style the door ventilator and window should be checked for proper alignment with the side roof rail weatherstrip and adjusted where required. In addition, when performing adjustment on any style do not close the door completely without making a visual check to see that the door lock extension engages in the striker notch as specified.
Removal and Installation
Remove door garnish molding, trim pad and small access hole cover.
Remove screws "A" and "B" (fig. 59), disengage regulator from "Tee" shaft and lower it between door panels out through small access opening.
To install, seal as specified under, Door Sealing, reverse removal procedure.
Adjustment
Ventilator flutter, when the ventilator is open, may be eliminated by tightening "Tee" shaft screw "A." Tighten screw carefully to avoid stripping threads (fig. 60). Opening and closing effort may be increased or decreased by an adjusting friction clamp screw "B."
Removal and Installation
Adjustment
In addition to the regulator adjustment, the ventilator assembly may be adjusted in or out, fore or aft to align the ventilator with the door glass. To adjust, loosen stud lock nut "C" and turn adjusting stud in or out as desired. Shift position of stud in opening for fore or aft adjustment and retighten lock nut. Seal stud with caulking compound.
Removal and Installation
Removal and Installation
Removal and Installation
NOTE: A redesigned spring clip is used on the door lock lovers to secure the connecting rods to the lock lovers. A slot in the spring clip provides easier disengagement of the clip thereby facilitating easier detachment of the lock connecting rods from the lock. To disengage spring clips, use a screw driver or other suitable tool to slide clip out of engagement. Figure 66 shows a door lock spring clip engaged and disengaged.
The manual regulator type rear door inner panel and the electric regulator type rear door Fig. 66-Door Lock Spring Clip
inner panels are shown in figures 67 and figure 68 respectively. The illustrations show the location of hardware parts and their attaching points.
Rear door inside hardware parts are installed and removed in the same manner as front door inside hardware parts and are covered under the front door in this section.
The rear door is attached to the center pillar with two butt-type hinges. The door may be removed with or without the hinge attached.
Removal
Installation
Adjustment
To check the rear door alignment in the body opening, remove the lock striker from the body lock pillar and allow the door to hang free. Then check spacing (fig. 57) between the door and body opening edges. Clearance between the door header and side roof rail and the door pillar and body pillar should be 1/16" - 3/16"- Clearance between the bottom of the door and rocker panel should be 1/8" - 1/4".
NOTE: Whenever a door has been adjusted, the door should not be closed completely until a visual check is made to determine if the lock extension will engage in the striker notch. Where required, door lock striker emergency spacers should be installed. See "Door Lock Striker Adjustments."
In or Out
Remove hinge cover plates at center pillar and loosen center pillar strap attaching bolts, shift door in or out as desired and retighten bolts.
Up or Down
Remove trim pad and loosen hinge strap attaching bolts at inner panel, shift door to desired position and retighten bolts.
Rearward
Support door, then remove upper center pillar hinge attaching bolts, and cement a full weatherproof shim to hinge strap and reinstall strap to center pillar. Perform same operation on lower hinge strap.
Forward
Support door, remove hinge cover plates and loosen hinge strap to center pillar attaching bolts. Insert a partial waterproof shim at the inner edge of the hinge straps and retighten bolts.
Reseal hinges and hinge cover plates as described under Rear Door removal.
Removal and Installation
Same as front door.
Removal and Installation
Free wheeling is a safety feature of rear door locks in all passenger models. The rear door lock may be placed in or out of free wheeling depending on the owner's preference. When a rear door lock is in the free wheeling position, with the locking rod knob in the down or locked position, the door cannot be opened by operation of the inside door handle. All passenger cars as shipped from production have rear door locks set in free wheeling. To place the rear door lock in free wheeling proceed as follows:
NOTE: Adjusting tool may be made from a 7" x 1/8" rod bent to form a right angle 3/8" from one end.
Removal and Installation
Removal and Installation
Removal and Installation
Removal and Installation
Removal and Installation
Similar procedure as front door except that door ventilator does not have to be removed.
Adjustment
Similar to front door.
Removal and Installation
Same procedure used as for front door except that there is no division channel adjusting stud and nut.
The removal and installation of rear door weatherstrips is similar to the weatherstrip operation on front doors. The service operation is covered in the Front Door section.
The rear door outside handle is removed and installed in the same manner as the front door outside handle. Removal and installation procedure is covered under Front Doors in this section.
Whenever work is performed on a door where any of the door inner panel weatherseals have been disturbed, the area must be resealed before the door trim assembly is reinstalled. Fig. 76 shows the door inner panel openings which are sealed to prevent water leakage and possible damage to the door trim assembly.
Window regulator attaching holes (4).
Door inner panel cam attaching holes (5).
Door trim assembly nail slots (6).
Arm rest attaching holes (7).
Welding access holes (8).
Cam access holes (9).
Lock access hole (10).
Front Door Assembly
Rear Door Assembly
Center Pillar Assembly
The door section is divided into the following parts:
Special attention should be given the door lock striker adjustments and dimensional specifications for use of striker emergency spacers. Special attention should also be given to both front and rear door window adjustments to provide proper window frame contact with the side roof rail weatherstrip.
Removal and Installation
Removal and Installation
The same procedure as on the plastic type on the sedan front door.
Removal and Installation
The same procedure as used on the sedan front door except that the door belt finishing molding must also be removed.
The side roof rail weatherstrip is a one-piece weatherstrip, with an "L" shaped metal insert through the entire length of the weatherstrip. The weatherstrip is secured to the side roof rail by fourteen screws and to the body front pillar by one screw.
IMPORTANT: The attaching holes in the side roof rail weatherstrip are elongated to provide "in" and "out" adjustment for proper contact with the front and rear door window frames. However, the amount of adjustment is small and is not intended to correct for improper ventilator or door window alignment. It is very important that the front door ventilator and the front and rear door windows are checked and, if necessary, aligned for proper contact with the side roof rail weatherstrip.
The following procedures may be used for removing, installing and adjusting the side roof rail weatherstrip.
Removal
CAUTION: Use care when removing and handling weatherstrip so as not to bond metal insert.
Installation
Adjustments
CAUTION: Shims should be well tapered and long enough
to provide a continuous sealing surface along the length of the
weatherstrip. Shims which are not tapered or too short may cause
irregularities in the sealing surface.
Front Door Assembly
Assembly and Hinges
The front door hinges are the swing-out type with an integral door check and hold open, similar to the sport coupe. The hinges are attached to the front body hinge pillar and to the door assembly with bolts, cage nuts and anchor plates. Either of two methods may be used to remove the door from the body.
Adjustment
Door adjustments are provided through the use of floating cage nuts and anchor plates in the door and adjacent hinge pillar. When checking the door for misalignment, remove the door lock striker from the body pillar to allow the door to hang free on its hinges.
IMPORTANT: After performing any door adjustments the front door ventilator and window should be checked for proper alignment with the side roof rail weatherstrip and adjusted, where required. In addition the door lock extension-to striker engagement should be checked and adjusted, if necessary.
Fig. 79 shows the front door inner panel areas which must be sealed to prevent entrance of water and possible damage to interior trim. Whenever any work is performed on the door where the weatherseal has been disturbed, the area must be resealed before the door trim assembly is reinstalled.
Sealing Operations
Over the window regulator attaching holes (1).
Over the window cam attaching holes (2).
Over the ventilator division channel lower
attaching hole (3).
Over trim assembly nail slots (4).
Over the wiring clip attaching hole (5).
Over the arm rest attaching holes (6).
Over both lower and upper hinge access hole (7).
Over the window cam access hole (8).
Over the manual window regulator spindle hole (9).
Over the door lock remote control connecting rod
clip attaching hole-apply before
installing clip (10).
On styles equipped with electrically operated
window regulators apply body caulking compound in the
upper rear corners, across the top and clown the side joints of switch
hole cover and inner panel. Sealer to be worked into openings to insure
proper seal (11).
Apply a sufficient
amount of body caulking compound to block off the ventilator tee shaft
access hole (12).
Apply body caulking compound over ventilator
regulator attaching holes (13).
Apply waterproof body tape over access hole (14).
Removal and Installation
After installation, clean off excess sealer and make sure bumper assembly is properly positioned in finishing molding.
Removal and Installation
The procedure used is the same as the Sport Coupe front door except that the belt finishing molding does not apply.
Adjustments
Adjustment procedure is similar to that used on the Sport Coupe.
The operation of the front door locks on the sport sedan styles is the same as on other sedan styles; however, due to the new center pillar design the lock is located lower in the door requiring connecting rods from the door outside handle and lock cylinder assemblies.
Similar to that used on Sedan front doors.
Removal
Similar procedure to that which is used on Sedan front doors.
The door outside handle is equipped with a bell crank lever which actuates the lock lever by means of a connecting rod. An adjusting nut is provided at the lower end of the outside handle connecting rod to provide adjustment for proper contact of the handle push button shaft with the bell crank.
Removal and Installation
Check operation of outside handle before installing access hole cover, door trim assembly and hardware parts. Seal door inner panel as specified in "FRONT DOOR INNER PANEL SEALING".
The front door lock cylinder operation differs from cylinders on other models in that the cylinder actuates the door lock by means of a connecting rod.
Removal and Installation
Disassembly and Assembly
Disassembly and Assembly (fig. 85)
Removal and Installation
Removal and Installation
Sport Sedan front door weatherstrip and hinge pillar auxiliary
weatherstrip procedures are the same as previously outlined under
"CONVERTIBLE AND SPORT COUPE DOOR" in this manual.
Rear Door Assembly
Removal and installation procedures are illustrated in fig. 86. Particular attention should be given the rear door window adjustments to provide proper window frame contact with the side roof rail weatherstrip, and to the door lock striker adjustments and dimensional specifications for use of striker emergency spacers.
The rear door assembly is attached to the body center pillar with two butt type hinges. The lower hinge, which has an integral type door check and hold open, is secured with three screws to an anchor plate at both the. door hinge pillar and center pillar. The upper hinge is secured with three screws to an anchor plate at the door hinge pillar and with three screws to an upper support at the center pillar.
Removal
Either of the following two methods can be used to remove the door from the body.