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1977 PONTIAC SERVICE MANUAL
I
Fig.
18-1
30 Replacing
1977
R-4 Valve Plate Retainer
Fig.
18-1
3
1
Replacing
1977
R-4 Discharge Valve Plate
4. Install comDresor shell. install comDressor on car and
"Evacuate and c h k g e the ~ e f r i ~ e r a n t
sysLem" according the
Steps 1 thru 10 of "Compressor Shell" Replacement
procedure.
R-4 COMPRESSOR CYLINDER AND
SHAFT ASM.
Remove
1. "Discharge the Refrigerant System" according to the
DISCHARGING, EVACUATING AND CHARGING
PROCEDURES FOR C.C.O.T. A/C SYSTEMS.
2. Remove compressor from car according to procedure.
3. Thoroughly clean exterior of compressor to prevent
dirt from getting into compressor during disassembly.
4. Attach compressor to J 25008-1 Holding Fixture and
clamp fixture in vise (Fig. 1B-98).
5. Keep clutch hub from turning with J 25030 Clutch
Hub Holding Tool. Remove shaft nut using J 9399 Thin Wall
Socket (Fig. 1B-99) and discard the nut.
6. Thread J 9401 Clutch Plate and Hub Asm. Remover
into hub. Hold body of tool with a wrench and turn center
screw into remover body to remove clutch plate and hub asm.
(Fig. 1 B- 100).
7. Remove shaft key from keyway in compressor shaft.
8. Mark location of clutch coil terminals. Remove rotor
and bearing assembly retainer ring, using J 6083 Snap-Ring
Pliers (#24). See Figure 1B-103.
9. Do not remove pulley rim mounting screws and lock
washers. Install J 25031-1 Rotor and Bearing Puller Guide
over end of compressor shaft and seat it on the front head
of the compressor (Fig. 1B-104).
10. Install J 2503 1-2 Rotor and Bearing Puller down into
rotor until puller arms engage recessed edge of rotor hub.
Hold puller and arms in place and tighten puller screw
against Puller Guide (Fig. 1B-105) to remove rotor and
bearing asm., clutch coil and pulley rim as an assembly. Be
careful not to drop the Puller Guide when removing the
assembly.
11. Remove shaft seal kit parts by performing steps 2
thru 6 of procedure for Compressor Shaft Seal Kit removal.
12. Remove (4) front head mounting screws and remove
front head (Figs. 1B-122 and 1B-123).
13. Remove and discard front head O-ring seal.
14. Note assembled position of (2) thrust and (1)
belleville washer and remove washers from compressor shaft.
15. Pry compressor shell retaining strap away from
cylinder and position strap high enough to clear cylinder as
shell is removed (Fig. 1B-127).
16. Remove J 25008-1 Holding Fixture and reverse
fixture with step block protrusions engaging shell. Install
medium length bolts through holding fixture. Thread bolts
into compressor cylinder until step of fixture protrusions
contact shell, finger tight on both sides (Fig. 1B-128). Be sure
step protrusions do not overlap cylinder but pass both sides.
17. Using a wrench, alternately tighten each bolt
approximately 1/4 turn to push shell free of O-rings on
cylinder.
If one screw appears to require more force to turn than
the other screw, immediately turn other screw to bring screw
threading sequence in step or shell will be cocked and made
more difficult to remove. If screws are kept in step while
turning, not much force is required. The shell can be removed
by hand as soon as shell is free of shell to cylinder O-rings.
Do not turn screws any further than necessary to release shell.
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