Chevrolet Chevelle 1977 Repair Manual page 37

Fig. 90--Releasing R etain in g Strap
1. Pry shell retaining strap away from cylinder and
position the strap high enough to clear cylinder as shell is
removed (Fig. 89).
2. Remove compressor holding fixture J-25008-1 and
reverse holding fixture step block protrusions engaging
compressor shell. Install medium length bolts through
holding fixture and thread them into compressor cylinder
until the step of the fixture protrusions contact compressor
shell, finger tight, both sides (Fig. 91). Check to be sure the
step protrusions do not overlap the cylinder but will pass
both sides.
3. Using a wrench, alternately tighten each bolt
approximately 1/4 turn to push shell free of "O" rings on
cylinder.
Fig. 9 1 - R e m o v in g Shell A s s e m b ly
AIR CONDITIONING
SHELL
RETAINING STRAP
Fig. 9 2 --Rem oving Valve Plate
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 remove. Normal removal does
not require much force on wrench if the screws are kept in
step while turning. 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.
4. Remove compressor shell, remove holding fixture
J-25008-1 from compressor, reverse fixture to again hold
compressor by the opposite side using the short length
screws.
At this point the valve plate retainer ring may be
removed using internal snap ring pliers, J-4245 (Fig. 92) and
remove the compressor valve plate (Fig. 93) for replacement
or piston inspection.
Installation
1. Remove old cylinder to shell "O" rings and discard.
Check compressor assembly and interior of compressor
shell to be sure they are free of lint or dirt.
2. Dip a cylinder to shell "O" ring in 525 Viscosity oil
and install in rear "O" ring groove of cylinder. Be careful
in moving "O" ring across cylinder surface to prevent
damaging "O" ring.
3. Dip remaining cylinder to shell "O" ring in oil and
install it in front "O" ring groove of cylinder.
4. Place compressor shell on cylinder and rotate
retaining strap to its original location (Fig. 91).
5. A ttach shell installing fixture J-25008-2 to the
holding fixture J-25008-1, using the long bolts and plate
washers of tool set.
Align the step projections of shell installing fixture J-
25008-2 to contact compressor shell evenly both sides.
6. Push compressor shell as close to "O" ring (Fig. 94)
as possible by hand and check for equal alignment of shell
around cylinder. Tighten fixture screws finger tight.
7. Using a wrench, alternately tighten each bolt
approximately 1/4 turn to push compressor shell over "O"
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