Chevrolet 1977 light duty truck, Service Manual

Page: 802 / 861

4. To install, reverse Steps 1-3 above and check
gauge operation.
G M odels
Replacem ent
1. Remove instrum ent cluster as previously de­
scribed in this section.
N O T E : Oil pressure line connection may leak oil
when opened; w rap with cloth.
2. Remove bulb holders, g ro unding screws and lift
lam inated circuit aside as necessary.
3. Remove instrum ent cluster cover to separate oil
pressure gauge from cluster.
4. Remove pipe fitting and retaining nut from
gauge being replaced then remove gauge from cluster
D O N O T K IN K PIPE.
5. To install replacem ent oil pressure gauge,
reverse Steps 1-4, then observe operation o f gauge.
OIL PRESSURE S EN D IN G U N IT
All M odels
R eplacem ent
1. D isco n n ect w irin g h arn ess c o n n e c to r from
sending unit term inal located in block above starter on
L-6 engines, at left front o f distributor on V-8 (except
454 V-8) or rear left side o f block (454 V-8) engines.
2. Rem ove s e n d in g unit using Tool J21757.
Replace with new unit and check operation.
VO LTM ETER
C-K M odels
Replacement
1. Perform Steps 1-5 o f " In stru m en t Cluster -
R eplacem ent" procedure.
2. Remove gauge to instrum ent panel screws and
remove meter.
3. To install, reverse Steps 1 and 2 above and
check meter operation.
N OTE: Be sure meter studs engage clips holding
printed circuit to back o f cluster housing.
G M odels
Replacem ent
1. Remove instrum ent cluster assembly as p re ­
viously described in this section.
2. Remove term inal nuts retaining laminated
circuit to meter.
3. Lay back la m in a te d circuit p o rtio n a fte r
removing grounding screws and bulb holders.
4. Remove attaching screws, cover and meter from
cluster housing.
5. Remove term inal attaching nuts and m eter from
cover plate.
6. To install, reverse Steps 1-5 and check operation
o f meter.
DIRECTIONAL SIGNAL SWITCH
The directional signal switch is a self-contained unit which incorporates
the h a z a rd w arning switch and the lane changing signal.
The hazard w arn in g circuit is activated by a push-pull switch which is
loacated on the right side o f the steering column, opposite the directional
signal lever. The switch knob must be pulled to cancel circuit.
T he lane changing circuit is activated by holding the directional signal
lever in the first detent position; there is no lock in or cancelling device
in this position.
See Section 3B "S teerin g " for all servicing procedures.
W INDSHIELD WIPER AND WASHER
C-K-G MODELS
GENERAL DESCRIPTION
T he wiper motor assembly consists o f com pound externally to the g a r shaft, operates the linkage which
w ound 12 volt D.C. motor, gear reduction m echanism activates the blades.
a n d park in g switch enclosed in a com m on die cast The w iper m otor is equipped with an in ternal circuit
housing. T h e arm atu re has a w o rm shaft which drives a breaker m ounted on the m otor brush plate which
g ear and shaft assembly. A crank arm which is attached protects the motor from overheating.