Chevrolet Chevelle 1977 Repair Manual page 38

1B-32
Fig. 9 3 -- ln s p e c tin g Piston and Reed A s s e m b ly
rings and back against shell stop flange at the rear of
compressor cylinder.
If one screw appears to require more force to turn than
the other, immediately turn the other screw to bring the
screw threading sequence in step or the shell will be cocked
and made more difficult to install. Norm al installation does
not require m uch force on wrench if screws are kept in step
while turning.
8. When shell is seated against the stops, bend shell
retaining strap down into place by tapping gently with a
hammer.
9. Remove shell installing fixture J-25008-2 and leak
test compressor.
OIL CHARGE
The radial four cylinder compressor is charged with 6.0
ounces of 525 viscosity oil. D uring normal operation a
certain am ount of oil will circulate with the Refrigerant 12
(R-12) in the system.
When necessary to replace a system component it is
recommended that oil be added to the system in accordance
to the following procedure.
If compressor is operable, idle vehicle for 10 minutes
with the A /C controls set for M aximum Cooling and High
Blower prior to discharging the system.
A dd additional oil as indicated in Diagnosis Section of
this Service Manual.
OVERHAUL MANUAL
P IS T O N A N D
REED A SSE M BLY
Oil Charge-Compressor Replacement
compressor suction and discharge ports. The compressor
should gravity drain for 10 minutes.
Service Manual.
assembly and blow dry with air prior to the installation of
a new compressor. It is not necessary to drain oil from the
replacement compressor.
from the system.
drain the oil from compressor as in Step 1 and determine
the am ount of oil drained from the original compressor.
Refer to the oil usage chart in section IB of the Service
manual for proper am ount of oil to be added.
SYSTEM PERFORMANCE EVALUATION
When system performance, efficiency and proper oil
charge is in doubt and must be evaluated accurately, it is
recommended that the system be flushed with R - ll and the
exact oil charge (6 ounces) of 525 viscosity oil be added to
the compressor prior to any further checks of the system.
Fig. 9 4 — I nsta11ing Shell A s s e m b ly
1. G ravity drain oil from a new compressor.
Position compressor with shaft end "up" and drain
Add additional oil as indicated in Section IB of the
W hen necessary to flush system with R - ll, drain
2. The refrigerant 12 (R-12) is to be slowly discharged
3. Remove original com pressor from vehicle, gravity