coil CHEVROLET CAMARO 1967 1.G Chassis Repair Manual

ELECTRICAL-BODY AND CHASSIS 12-52

GEAR MECHANISM

NOT IN PARK

RELAY SWITCH ATTACHING SCREW

Fig.
81 -
Drive Gear not
in
Park Position

TERMINAL BOARD

1 2 3

RELAY LEADS (RED)

SOLDER TO NO. 1 TERMINAL

RELAY
COIL-RED

TAN-SOLDER TO

SAME RELAY SWITCH TERMINAL WITH RED COIL LEAD

BLACK WITH PINK STRIPE
ASSEMBLY

1.
If new field and case assembly is being installed,

splice the black and black with pink stripe leads of

the new field with the corresponding leads of the

wiper.

2.
Install the rubber thrust disc, steel thrust disc and

felt lubricating washer in the case assembly bearing

in the order indicated.

3.
Lubricate end of armature shaft that fits in case

bearing. Next, install thrust ball in end of shaft.

4.
Assemble armature in the case and field assembly.

5.
Position the partially assembled brush plate over the

armature shaft far enough to allow re-assembly of

the remaining brush in its brush holder;- then position

the brush plate assembly on the mounting tabs in the

position shown in Figure 78.

NOTE: Circuit breaker ground lead will not

reach circuit breaker terminal if brush plate is

positioned wrong.

6. Center the brush plate mounting holes over the

mounting tabs and bend the tabs toward the brush

holders as required to secure the brush plate in

position.

CAUTION: Be sure tabs are centered in brush

plate mounting holes.

7.
Remove brush retainer clips and resolder circuit

breaker ground lead to circuit breaker. Refer to

Figure

8. If new case and field assembly'is used, scribe a line

on it in the same location as the one scribed on the

old case. This will insure proper alignment of the

new case with the scribed line made on the housing

(Step
1
under Brush Plate Removal).

9. Position armature worm shaft inside the housing and,

using the scribed reference marks, line up as near

Fig.
82 - Relay Assembly Wiring
Fig.
83 -
Terminal Board Resistor

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-53

13

10 11

Fig.
84- Drive Gear Mechanism Assembly

1.
Drive Gear Shaft

2.
Drive Pawl

3. Lock Pawl

4.
Coil Spring
5. Drive Gear

6. Relay Assembly

7. Spacer
8. Shield

9. Seal

10.
Washer
11.
Snap Ring

12.
Crank Arm

13.
Nut

10.

1

NOTE:

VIEW SHOWS RELAY SWITCH ASSEMBLY

AND TERMINAL BOARD REMOVED.

GEAR MAY BE REMOVED WITHOUT

DISTURBING RELAY SWITCH

OR TERMINAL BOARD. f* ;<^ / t

\ MAINTAIN GEAR

J ASSEMBLY IN

V POSITION

^^ SHOWN

FT"
DURING

* & REASSEMBLY

WM IN HOUSING

f

INNER SPACER

J WASHER

ft
as possible the case and field assembly with the

housing.

Maintaining the armature in its assembled position

in the case, start the armature worm shaft through

the field and housing bearing until it starts to mesh

with the worm gear. At the same time carefully pull

the excess black and black with pink stripe leads

thru the housing grommet.

DRIVE

PAWL
DRIVE SHAFT AND

PLATE ASSEMBLY

LOCK

PAWL

Fig.
85 - Removing Gear Assembly
Fig.
86 - Lock and Drive Pawl Assembly

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-54

INNER

SPACER

WASHER

LOCK

PAWL

COIL

SPRING

DRIVE,

PAWL

DRIVE
SHAFT

AND
PLATE

ASSEMBLY
DRIVE
AND
LOCK
PAWL
GUIDE

PINS
IN
GEAR
POCKETS
7

DURING
NORMAL
OPERATION

RELAY
LATCH
ARM
IS
HELD

OUT OF
PATH
OF
GEAR
BY

RELAY
MAGNET

11.

12.
Fig. 87 - Drive Gear and Shaft Assembly

CAUTION: It may be necessary at this point to

rotate armature slightly before the armature

worm will engage with worm gear teeth.

Rotate the case as required to align the bolt holes in

the case with those in the housing.

Secure the case to the housing with the two tie bolts.

GEAR BOX SECTION
Fig. 88 - Drive and Lock Pawl Guide Pins in Pockets

(drive pawl away from latch arm, fig. 81), proceed

to Step 3.

Remove relay-switch attaching screw (fig. 80) and

carefully lift the relay-switch assembly out of the

gear box. Unsolder leads from switch terminals as

required. Refer to Figure when resoldering leads.

To remove terminal board assembly simply slide it

out of housing and unsolder leads as required.

The gear box section is subdivided into two areas, (A)

the relay control and latching mechanism and (B) the

drive gear mechanism.

A—Relay Switch and Latch Assembly-

Terminal Board Removal

1.
Remove screws retaining washer pump assembly to

wiper unit.

2.
If wiper pawl is in full park position (drive pawl lo-

cated in magnetic switch assembly slot, fig. 79), it

becomes necessary to remove gear assembly first

(see Gear Assembly Removal).

If wiper gear mechanism is not in park position
VALVE

ASSEMBLY—j

RATCHET ->Mmk
LATC

SPR
HOUT

ING
RELAY COIL

/PAWL SPRING

/ /'

^L / PAWL

|j^»i It

RATCHET

WHEEL

Fig. 89 - Washer Pump Assembly

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY
AND
CHASSIS
12-55

COVER RELAY COIL

ASSEMBLY
PAWL SPRING

a=-

VALVE ASSEMBLY

RATCHET DOG AND _/_ f1

LATCHOUT SPRING ^—-»*
PAWL

RATCHET WHEEL

J

Fig.
SO
-
Exploded View
of
Pump

Relay Switch—Latch and Terminal Board Assembly

1.
Resolder leads
to
wiper terminal board as required

(fig. 82).

2.
Slide terminal board into wiper housing being careful

to position the terminal board resistor lead as shown

in Figure 83.

3.
Resolder leads
to
relay switch assembly
as
required

(fig. 82).

4.
Position relay-switch assembly
in
housing.

CAUTION:
Be
very careful
to
route leads
in

such
a
manner
as to
avoid having them pinched

between relay and wiper housing.

5. Install relay-switch mounting screw.

6. Assemble gear box cover and washer pump assembly

to wiper being careful that the ground strap
is
prop-

erly connected. Refer
to
Figure 75 for assembly
of

washer pump
to
gear housing.

B-Drive Gear Disassembly (Fig.
84)

1.
Remove washer pump assembly.

2.
Remove crank
arm
retaining nut, crank arm, rubber

seal
cap,
retaining ring, shim washers, shield
and

spacer washer in the order indicated.

3.
Slide gear assembly out
of
housing (fig. 85).

4.
Slide drive plate and shaft out
of
gear and remove the

drive pawl, lock pawl
and
coil spring
as
required.

Drive Gear—Assembly

1.
Position drive pawl
on
drive plate
as
shown
in
Fig.

ure 86.

2.
Assemble lock pawl over drive pawl
as
shown
in

Figure
86.

3.
Slide gear
and
tube over
the
drive shaft (fig. 87).

(Move drive and lock pawls
as
required to allow their

respective pins
to fit in the
gear guide channel,

fig.
88).

4.
Holding
the
gear, manually rotate
the
drive plate

until
the
drive
and
lock pawl guide pins snap into

their respective pockets in the gear (fig. 88).
5. Reinstall coil spring between lock
and
drive pawls

(fig. 88).

IMPORTANT: Be very careful
to
maintain lock

and drive pawl guide pins
in
their respective

pockets during Step
6.

6. Assemble inner spacer washer over gear shaft
and

assemble gear mechanism
in
housing
so
that
it is

positioned with respect to the housing in the approxi-

mate location shown
in
Figure 85.

7. Reassemble
the
outer spacer washer, shield, shim

washers
as
required
to
obtain .005"
max.
end play,

snap ring and rubber seal cap in the order indicated.

Refer to Figure 84.

8. Operate wiper
to
"park"
or
"off" position and install

crank arm.

9. Reassemble washer pump
to
wiper (fig. 75).

WASHER PUMP UNIT

The washer pump and/or valve assembly
may be re-

moved from the wiper assembly
as a
unit; therefore,
it is

not necessary
to
remove
the
wiper assembly irom
the

vehicle
if
only
the
washer pump and/or valve assembly

required service.

When
the
pump
is
removed from
the
wiper assembly,

all working parts
are
readily accessible and may easily

be serviced
as
necessary
(fig. 89).
An exploded view
of

the washer pump
is
shown in Figure 90.

Removal and Installation

1.
Raise vehicle hood.

2.
Disconnect washer hoses
and
electrical connections

from assembly.

3.
Remove
3
screws securing washer pump
and
cover

to wiper assembly. Remove pump from wiper gear

box.

4.
Position pump
and
cover assembly
to
the wiper and

install retaining screws.

5. Connect washer hoses
to
valve assembly and wiring

leads
to
pump and wiper terminals.

6. Check operation
of
unit.

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY
AND
CHASSIS
12-56

DEPRESSED PARK 2-SPEED WIPER
AND
WASHER

CORVETTE

GENERAL DESCRIPTION

The 2-speed windshield wiper
(fig. 91)
consists
of a

compound wound
12
volt dc motor and
a
gear box section

containing
the
gear mechanism
and
relay control.
The

motor armature
is
fitted with
a
worm gear which drives

the main gear assembly and crank arm.

The relay control, consisting
of a
relay coil, relay
armature
and
switch assembly,
is
located in the gear
box"

section and controls the starting and stopping of the wiper

through
a
latching mechanism (fig. 92).

An electric .washer pump
is
mounted
on the
gear box

section
of the
wiper
and is
driven by the wiper unit gear

assembly (fig. 93).

SERVICE OPERATIONS

WIPER MOTOR
AND
WASHER

PUMP ASSEMBLY

REMOVAL AND INSTALLATION

1.
Raise vehicle hood
and
disconnect, ground lead
at

battery.

2.
Remove engine distributor shielding
and
left bank

spark plug wire vertical shield.

3.
Disconnect left bank spark plug wire bracket-to-

manifold and position assembly to one side.

4.
Disconnect ignition resistor at firewall, then remove

washer pump inlet
and
outlet hose
at
pump valve

assembly.

5.
Remove engine distributor
cap
and position
to one

side;
then disconnect washer pump
and
motor
as-

sembly lead wires.

6. Remove glove
box
door
and
compartment. Refer
to

Section
1
for
removal procedure.

7.
Make sure wiper arms
and
wiper motor are both
in

the parked position; then remove
the
wiper trans-

mission retaining clip and disconnect both transmis-

sion and spacer from crank arm (fig. 93).

8. Remove four wiper motor-to-dash wall mounting

bolts and remove wiper motor from vehicle.

9. With
the aid of
an assistant position the wiper motor

to
the
dash wall
and
install the four motor mounting

bolts,
making sure motor assembly
is in
parked

position.

GEAR

BOX

SECTION
—<

MOUNTING
^*^

GROMMET

MOTOR
_/

SECTION
MOUNTING

/"""GROMMET

ARMATURE
END
PLAY

ADJUSTING SCREW

AND LOCK
NUT

P
^
CRANK

^_ /GROMMETS
RELAY

Fig.
92 -
Relay Control

10.
Position left transmission assembly, spacer
and

right transmission assembly
on
crank arm, then in-

stall
the
retaining clip
in the
groove
in
the crank

arm.

11.
Install glove compartment and door assembly. Refer

to Section
1
for
installation procedure.

12.
Install washer pump and motor assembly lead wires;

then install engine-distributor cap.

13.
Install washer pump inlet
and
outlet hose
to
pump

valve assembly, then install ignition resistor
to

firewall.

14.
Connect left bank spark plug wire bracket-to-mani-

fold, vertical shield and engine distributor shielding.

ROTOR
CAM. ^

CAM SLOT-~-*"'-*

WASHER PUMP^.

DRIVE
PIN
m

M
VALVE

— ASSEMBLY

i

Fig.
91 - Wiper Assembly—Corvette
Fig.
93 - Washer Pump

CHEVROLET CHASSIS SERVICE MANUAL

ELECTRICAL-BODY AND CHASSIS 12-59

NOTE: it may be necessary at this point to

rotate the armature slightly before the worm

will engage with the worm gear.

5.
Rotate the case as required to align the holes in the

case with those in the housing.

6. Being very careful not to pinch any of the motor

leads between the case and edge of the field, push the

case onto the field until it butts against the housing.

7.
Secure case to housing with two tie bolts.

8. Install end-play adjusting screws and locknut and

adjust end-play by tightening adjusting screw finger

tight; then back off screw 1/4 turn and tighten

locknut.

GEAR BOX SECTION

The gear box section is subdivided into two areas, (A)

the relay control and latching mechanism and (B) the

drive gear mechanism.

A—Relay Control and Latching Mechanism:

Disassembly

1.
Remove four screws which secure the washer pump

assembly to gear box.

2.
Refer to Figure 97. Disconnect coil spring, remove

"E"
ring and lift the latch and follower assembly off

the pivot pin and relay armature.

3.
Remove the stop assembly retaining screw. This

will permit the stop assembly to be moved as neces-

sary to allow clearance for removing the relay con-

trol assembly.
Fig.
100 - Assembly Gear and Eccentric Shaft

4.
Remove the two screws that secure the relay control

assembly.

5.
Lift the relay control assembly out of the gearbox

and unsolder leads as required.

Reassembly

1.
Solder existing green and yellow wiper leads to relay

control switch and solder the relay coil Iea4 to the

wiper unit terminal board as shown in Figure

B—Drive Gear Mechanism:

Disassembly

Refer to Figure 84 unless other wise specified.

1.
Remove the crank arm retaining nut (No. 1).

2.
Remove crank arm (No. 2), snap ring (No. 3) and

rubber seal (No. 4).

3.
Remove the retaining ring (No. 5), end play washers

(No.
6), shield (No. 7) and spacer washer (No. 8).

4.
Follow Steps 1 through 3 under relay control and

latch mechanism disassembly.

Fig.
99 - Lock and Drive Pawi Mechanism
Fig.
101 - Drive Gear Mechanism Installed

CHEVROLET CHASSIS SER\

ELECTRICAL-BODY AND CHASSIS 12-60

....
£
VALVE ASSEMBLY

mm

BROWN
*yr

RED '
WATER

INTAKE

PORT

|f|i

Wjjm WATER

|HP DISCHARGE

W PORTS

WASHER

PUMP

ASSEMBLY

Fig.
102 - Washer Pump Assembly

5. Remove gear mechanism from the gear box and slide

spacer washer (No. 9) off the gear assembly eccen-

tric shaft.

6. Slide the drive plate and shaft assembly (No.. 11) out

of the gear, assembly, remove the lock and drive

pawls (Nos. 12 and 13) and remove the coil spring

(No.
14).

Reassembly

1.
Assemble lock and drive pawls to the shaft and drive

plate assembly as shown in Figure 99.

2.
Install the assembled parts from Step 1 in the gear

and eccentric shaft as shown in Figure 100.

3.
Connect the coil tension spring between the lock and

drive pawls (fig. 100).
4.
Reinstall spacer washer on the eccentric shaft of the

gear.

5. Reinstall gear mechanism in the housing as shown in

Figure 101.

6. Reassemble the parts removed in Steps 1 through 4

under drive gear disassembly.

The washer pump and/or valve assembly (fig. 102) may

be removed from the wiper assembly as a unit; therefore

it is- not necessary to remove the. wiper assembly from

the vehicle if only the washer pump and/or valve assem-

bly requires service.

WASHER PUMP SECTION

PUMP REPLACEMENT

. To replace the washer pump assembly proceed as

follows:

1.
Raise vehicle hood and remove engine distributor

shielding and distributor cap.

2.
Remove lead wires from washer pump and disconnect

ground wire from screw retained connector; discon-

nect hoses from valve unit.

3.
Remove four screws which secure the washer pump

assembly to the gear box.

a* The water inlet and outlet valve assembly is

serviced as a unit if required; also the rotor cam

is serviced separately.

4.
Install washer pump and cover assembly so that the

slot in the washer pump cam fits over the pin on the

wiper unit drive plate.

5. Install the four washer pump to gear box retaining

screws, position ground lug under lower screw.

6. Connect valve inlet and outlet hoses, attach ground

lead and washer pump lead wires.

7. Install engine distributor cap and shielding.

8. Lower hood and check operation of wiper unit.

SPECIAL TOOLS

J-21932

BEZEL NUT REMOVER

Fig.
103 - Special Tools

CHEVROLET CHASSIS SERVICE MANUAL

driven disk is sandwiched between the magnetic disk and

a field plate. The field plate forms a returning path for

the magnetic field from the magnetic disk.

The gear drive for the magnetic disk is a 90 degree

nylon gear drive with the driven gear rotating both the

magnetic disK and the speedometer drive cable.

Vacuum Switch, Air Bleed and Filter, and Low

Limit Speed Switch

The end of the shaft from the speed sensing assembly

with the rubber drum extends into the air bleed metering

assembly. This rubber drum has a tang extending from

its surface which allows a set of points to close at a

specific car speed. When the car reaches about 20 mph,

the rubber drum has rotated far enough (moved by the

brass driven disk in the magnetic field) so that its tang

has allowed a spring loaded electrical point to contact

another point. These points are in series with the sole-

noid coil so that under 20 mph, no Regulator operation

is possible.

Surrounding the rubber drum is a "U" shaped spring

clip which is held spread away from the drum by the

nose or cam of the solenoid when the solenoid is in the

relaxed position. The rubber drum and this clip com-

prise the speed clutch of the regulator. When the sole-

noid is energized, the solenoid nose moves toward the

drum and releases the ends of the clip. The clip springs

inward and attaches itself by friction to the drum. Now,
ACCESSORIES 15-5

any change in car speed will rotate the drum and move

the "U" clip just as a speedometer moves its needle.

The top of the MUtf clip is attached to the air bleed valve.

The clip moves a sleeve which slides on the orifice

tube thereby covering and uncovering air ports in the

wall of the tube (the tube inner end is plugged) whenever

car speed changes from the speed at which the solenoid

was energized. The direction of drum rotation is such

that resulting bleed valve operation will cause the Servo

to decrease engine power if the car exceeds the preset

speed and increase engine power if car speed decreases.

The air which passes out the orifice tube enters the

Regulator through the openings in the solenoid housing,

passes through the oil wetted polyurethane filter, and then

enters the orifice tube ports.

When the solenoid is de-energized, the nose retracts

and cams the ends of the "U" clip outward so that it re-

leases the rubber drum.

The solenoid also operates a vacuum switch simul-

taneously with the clutching and declutching of the "U"

clip.
The vacuum switch supplies the Servo unit with

manifold vacuum. The solenoid operated vacuum valve

slides over two ports in the Regulator wall. One port

is connected to manifold vacuum and the other is con-

nected to the center port of the Servo unit. When the

solenoid is de-energized, the valve closes the manifold

vacuum port and opens the Servo port to the inside of

the regulator case. When the solenoid is energized, the

valve connects the Servo port to the manifold vacuum

AAAGNET

SPEED CUP

FIELD PLATE

HAIRSPRING
TO SPEEDOMETER

MAGNET HOUSING

ASSEMBLY
ORIFICE TUBE &

CONNECTOR ASSEM.
CONTROL

VALVE

CLUTCH

SPRING

LOW LIMIT

SPEED SWITCH

RUBBER

DRUM

VACUUM PORT

TO SERVO

INPUT CONNECTION

SOLENOID COIL

SOLENOID AND CLUTCH

HOUSING ASSEMBLY
VACUUM PORT

TO ENGINE

VACUUM VALVE

UNLOCKING CAM

•SOLENOID PLUNGER

AIR FILTER

SIDE VIEW SECTION

REGULATOR DISENGAGED
END VIEW SECTION

ENGAGED

Fig.
8 - Regulator-Cross Section '

CHEVROLET CHASSIS SERVICE MANUAL

ACCESSORIES
15-6

port thereby supplying vacuum to the Servo unit.

During system operation
the
following events occur:

1.
Car
speed below
20
mph—no function
of the
unit

because
the
rubber drum
has
not rotated
far
enough

to close
the
solenoid points.
No
energizing current

can flow through the solenoid coil.

2.
Car
speed above
20
mph—The tang
on the
rubber

drum
has
closed
the
solenoid points
and
current
is

flowing through
the 40 ohm
resistance wire
to the

solenoid coil. This current
is
not sufficient to "pull

in", the solenoid.

3.
Driver partially presses Engagement Switch—full

voltage flows through
the
solenoid
to
pull
it
into

operation. Solenoid
cam
tension
on the "U"
clip
is

released and the clip grips the rubber drum. Simul-

taneously the vacuum switch operates; applying man-

ifold vacuum
to the
Servo unit which tightens
the

throttle chain. When
the
driver releases pressure

from
the
accelerator pedal
the
unit will position the

throttle
to
maintain the speed
at
the time
of
solenoid
operation.

Driver releases
the
Engagement Switch—current

flows
to the
solenoid through
the 40
ohm wire and

since the solenoid is "pulled in", the reduced current

flow
is
sufficient to hold
it
in position.

The
car
begins
to
ascend
a
hill—car speed drops

slightly (very slightly) and the magnetic force on the

driven disk
of the
speed sensor
is
decreased.
The

disk rotates slightly
(as
would
a
speedometer shaft

because
of
hairspring tension) turning
the
rubber

drum. Since
the "U"
clip
is
gripping
the
drum,
it

moves
the
slide which COVERS
the air
bleed ports

more. With less air bleeding into the Servo, greater

vacuum exists
in it
and the diaphragm moves toward

the vacuum port opening
the
throttle wider.
The

tapered needle moves into the orifice further and the

diaphragm balances
in a
new position with the wider

throttle opening.
Car
speed
has
been maintained

automatically.

1.
Speedometer Cable

Adapter (From

Transmission)

2.
Gasket

3. Speedometer Cable

Adapter
(To

Speedometer)

4.
Adapter
and
Magnet

Housing

5. Rotating Magnet

6. Helical Ramp
7. Field Plate Adjusting

Pinion

8. Adjusting Pinion

Locating Spring

9. Brass Magnetically

Driven Disk

10.
Field Plate

11.
Hair Spring

12.
Hair Spring Keeper

13.
Rubber Drum

Tang
14.
Rubber Drum

1$.
"U"
Shaped Clutch

Spring

16.
Air
Bleed Sleeve

17.
Orifice Tube

18.
Orifice

19.
Orifice Tube Locknut

20.
Clutch
and
Solenoid

Housing

21.
Vacuum Supply Port

(To Servo)
22.
Vacuum Port (To

Intake Manifold)

23.
Vacuum Valve Slide

24.
Solenoid Coil

25.
Solenoid Plunger

Return Spring

26.
Solenoid Cover Gasket

27.
Air Filter

28.
Solenoid Cover

29.
Air Inlets

Fig.
9-
Regulator
-
Exploded

CHEVROLET CHASSIS SERVICE MANUAL

ACCESSORIES
15-8

BROWN
BRAKE

SWITCH

+12V *

BLACK
CONNECTOR

AT FUSE BLOCK

CRUISE POSITION

BUTTON RELEASED

ENGAGE POSITION

BUTTON PARTIALLY DEPRESSED^ N. ENOAOi SWITCH

TRIM POSITION N. N. I

BUHON FULLY DEPRESSED. \ ^

BROWN

BLUE

ENGAGE SWITCH

CONFIGURATION

BLACK

BLUE

REGULATOR
- SOLENOID COIL

(5 a RESISTANCE)
9 BLACK

BLUE

REGULATOR

Fig.
10 - Wiring Diagram

Replacement

1.
Insert the switch into the turn signal knob, push the

retaining ring firmly against the switch, and push the

operating button onto the switch plunger. " .
SERVO

Service
—
H the Servo unit is found to be defective, re-

placement is required. Note the condition of the hoses

and replace any which are cracked or deteriorated.

CHEVROLET CHASSIS SERVICE MANUAL