Chevrolet 1988 Light Duty Truck Repair Manual page 85

Install the shaft nut (21) on the com pressor shaft
(38) if the pulley assem bly and clutch plate and hub
assembly are not installed.
Using a box-end wrench, or a socket and handle,
rotate the com pressor shaft (38) several turns to lu­
bricate the pistons and cylinder walls.
C onnect the charging station high-pressure line, or
a high-pressure gage and gage adapter to J 9625-A
high-side connector.
Attach an adapter or depressor-type hose to the
suction or low-pressure port of J 9625-A to open the
Schrader-type valve. Oil will drain out of the com ­
pressor suction port adapter if the com pressor is po­
sitioned with the suction port downward.
Attach the com pressor to J 34992 fixture and mount
the com pressor in a vise so that the com pressor will
be in a horizontal position and the shaft (38) can be
turned with a wrench.
Rotate the com pressor shaft (38) or drive plate hub
six to eight com plete revolutions at a speed of ap­
proximately one revolution per second. A slower ro­
tation can result in a lower pump-up pressure and
disqualify a good pum ping compressor.
Type — Harrison D A-V5........................................................................................................................................................C ylinder Axial
D is p la c e m e n t.................................................................................................................................................................................9.2 Cu. In.
R ota tion ............................................................................................................................................................................................ C lockwise
525 Viscosity C om pressor Oil (Full C h a rg e ).............................................................................................................0.226 8 kg (8 oz.)
TORQUE SPECIFICATIONS
C om pressor Suction and Discharge Connector B o lt ...................................................................................... 34 N m (25 ft. lbs.)
Shaft N u t ..................................................................................................................................................................... 17 N m (12 ft. lbs.)
Pressure Relief Valve.................................................................................................................................................9 N m (80 in. lbs.)
Through B olts.............................................................................................................................................................. 9 N m (80 in. lbs.)
Oil Drain P lu g ............................................................................................................................................................ 16 N m (12 ft. lbs.)
DA-V5 AIR CONDITIONING COMPRESSOR 1B4-13
SPECIFICATIONS
Observe the reading on the high-pressure gage at
the com pletion of the tenth revolution of the com ­
pressor shaft (38). The pressure reading for a good
pum ping com pressor should be 690 kPa (100 psi) or
above. A pressure reading of less than 620 kPa (90
psi) would indicate one or more suction and/or dis­
charge valves leaking, an internal leak, or an inoper­
ative valve. Disassemble the com pressor and repair
as necessary. Reassemble and repeat the pump-up
test.
Following the pressure pump-up test, release the air
pressure from the high side and remove the gage
adapters and J 9625-A test plate.
Tilt the com pressor to place the suction and dis­
charge ports downward to allow oil to drain from the
compressor.
Allow a 10-minute drain period and then charge the
com pressor with the proper amount of oil. Pour the
new 525 viscosity refrigerant oil into the suction
port.
If furthjer assem bly or processing is required, install
a shipping plate or test plate J 9625-A to protect the
com pressor from contam ination.