Chevrolet 1977 10 Series, Repair Manual, Page: 26 / 468

1B-20
OVERHAUL MANUAL
Fig. 6 0 —I nsta llin g Fro n t Head Ca stin g
with 525 viscosity refrigerant oil around outer edge where
large diam eter O-ring will be placed. Oil the valve reeds,
pum p gears, and area where sealing surface will contact rear
discharge valve plate.
21. Using the 525 oil, lubricate new head to-shell O-
ring and install on rear discharge valve plate, in contact with
shell (Fig. 65).
22. Install suction screen in rear head casting, using
care not to dam age screen.
23. Coat sealing surface on webs of compressor rear
head casting with 525 viscosity refrigerant oil.
24. Install rear head assembly over studs on
com pressor shell.
The tw o lower threaded
compressor mounting holes should be in
alignment w ith the compressor sump.
M ake certain that suction screen does not drop out of
place when lowering rear head into position (Fig. 66).
If rear head assembly will not slide down over dowels
in internal mechanism, twist front head assembly back-and-
forth very slightly by-hand until rear head drops over dowel
Fig. 6 2 —1 nsta lling A- 6 C o m p r e s s o r Shell
pins.
25. Install nuts on threaded shell studs and tighten
evenly to 19-25 lb. ft. torque using a 0-50 lb. ft. torque
wrench.
26. Invert com pressor in Holding Fixture and install
compressor shaft seal as described in "Com pressor Shaft
Seal" Replacement procedure.
27. Install com pressor clutch coil and housing
assembly as described in "Com pressor Clutch Coil and
Housing Asm." Replacem ent procedure.
28. Install com pressor pulley and bearing assembly as
described in "Com pressor Pulley and Bearing"
Replacement procedure.
29. Install com pressor clutch plate and hub assembly
as described in "Com pressor Clutch Plate and H ub Asm."
Replacement procedure.
30. Add required am ount of 525 viscosity refrigerant
oil. Refer to com pressor oil charge, Figure 5 Section IB, of
the 1977 Service M anual.
31. Check for external and internal leaks as described
in the"C om pressor Leak Testing" procedure at the end of
this section.
Fig. 6 1 -F ro n t Head O-Ring Installed Fig. 6 3 —I nsta lling Oil Pick-Up Tube