Specifications - Chevrolet 1988 Light Duty Truck Repair Manual

Im p o rta n t
— Oil will drain out of the com pressor suc­
tion port adapter if the com pressor is
placed with the suction port downward.
9. Attach the com pressor to the J 25008-A holding fix ­
ture with m etric mounting screws. Clamp the com ­
p re s s o r h o ld in g fix tu re in a vise so th a t th e
com pressor can be turned with a wrench.
10. W ith a wrench, rotate the com pressor crankshaft or
drive plate hub ten revolutions at a speed of one
revolution per second.
• Turning the com pressor at less than one revo­
lution per second can cause a lower pump-up
pressure and disqualify a good pum ping com ­
pressor.
11. W atch the reading on the high-pressure gage at the
com pletion of the tenth revolution.
— The reading for a good pum ping com pressor
should be 344.75 kPa (50 psi).
Type — Harrison R-4 com pressor...............................................................................................................................
D is p la c e m e n t...............................................................................................................................................................................10.0 Cu. In.
R o tation ............................................................................................................................................................................................ Clockw ise
Oil C ap acity..........................................................................................................................................................................0.312 kg (11 oz.)
TORQUE SPECIFICATIONS
Oil Drain S c re w .......................................................................................................................................................... 17 N m (13 ft
Cycling Pressure S w itc h ........................................................................................................................................10 N m (7.5 ft
Shaft N u t ..................................................................................................................................................................... 17 N m (13 ft
Pressure Relief V a lv e ...............................................................................................................................................17 N-m (13 ft
Front Head B olts........................................................................................................................................................27 N m (20 ft
Rim M ounting S c re w s .......................................................................................................................................... 11 N m (100 in
Clutch Plate to Rotor A ir G a p .............................................................................................................0.5-1.0 mm (0.020-0.040 inch)
R-4 AIR CONDITIONING COMPRESSOR 1B3-13
12. After com pleting the pressure pum p-up test, release
the air pressure from the high side and remove
J 5420 gage adapter and J 9625 test plate.
13. Tilt the com pressor to place the suction and dis­
charge ports downward.
14. Drain oil from the compressor. A fter 10 minutes,
charge with the proper am ount of oil. Pour the oil
into the suction port.

SPECIFICATIONS

— A reading of less than 310.275 kPa (45 psi)
would indicate one or more suction and/or dis­
charge valves are leaking, an internal leak
and/or discharge valves leaking, an internal
leak or an inoperative valve. Disassemble and
check the compressor.
• If further assem bly or processing is required,
install a shipping plate or J 9625 to keep air,
dirt and moisture out of the com pressor unit it
is installed.
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