Chevrolet 1977 light duty truck Service Manual page 53

REAR HEAD
OIL PUMP
GEARS
PRESSURE RELIEF
V A L V E
OIL PICK-UP TUBE
All have inlet and outlet connections connected by a
strap to form an integral unit.
G Models have gauge fittings located on the muffler
a n d com pressor inlet line. M otor Home Chassis unit
fittings are located on the inlet and outlet lines. C-K
model gauge fittings are located on the accumulator and
ev ap orator inlet line. All fittings are equipped with a
valve core.
Pressure Relief Valve
The pressure relief valve, located on the compressor
THRUST
OIL SUMP
FRONT CYLINDER
RACE
HALF
REAR CYL INDER
HALF
Fig. IB -4 -A x ia l Six Cylinder Compressor -Cross Sectional View
FRONT
DISCHARGE V A L VE PLATE
SHAFT SEAL ASM.
CLUTCH COIL
AND HOUSING
RETAINER RING (CO NVEX .
SIDE FACING SPACER)
rear head, is simply a safety valve designed to open
automatically if the system pressure should reach a p re ­
determined level high enough to cause system damage.
A fter the pressure drops to a safe level the valve will
close. A fter such an occurence, the system should be
throughly checked to discover and correct the cause of
the abnorm al pressure increase, and then should be
purged, evacuated and charged.
RAD IA L FOUR CYLINDER CO M PRESSO R
A Radial four cylinder compressor (Fig. IB-5) is
PULLEY
PULLEY BEARING
CLUTCH PLATE
AND
HUB ASSEMBLY
SEAL SEAT
RETAINER RING
SEAL SLEEVE
SHAFT NUT