Chevrolet Chevelle 1977 Repair Manual page 13

THIS RIDGE
OF TOOL
MUST BE
UP WHEN
INSTALLING
BEARING
SUPPORT
BLOCK
J - 2 1
Fig. 1 5-- In stalling Be a rin g on Pulley
SHAFT SEAL
Seal Leak Detection
A SHAFT SEAL SHOULD NOT BE CHANGED
BECAUSE OF AN OIL-LINE ON THE HOOD
INSULATOR. The seal is designed to seep some
oil for lubrication purposes. Only change a shaft
seal when a leak is detected by the following
procedure .
W hen refrigerant system components other than the
compressor are replaced, the compressor must be removed
and oil drained from the compressor if oil was sprayed in
large am ounts due to leaks or a broken shaft seal.
Fig. 1 6 -R e m o v in g Coil Ho u sin g Re tainer Ring
AIR CONDITIONING
PULLEY A N D
B EAR IN G
INSTALLER
Clutch Coil and
HousinaAssembly
R e ta in e r Ring
Fig. 1 7 — 1 nsta lling Coil H ousin g
Compressor shaft seals, unless replaced during a
compressor overhaul, are to be replaced only on the basis
of actual refrigerant leakage as determined by test with leak
detector.
W H EN R E P L A C IN G
ASSEMBLY, even if the compressor remains on the vehicle
during the operation, IT W IL L BE NECESSARY TO
P U R G E T H E SYSTEM O F R E F R IG E R A N T as outlined
earlier in the Service Manual.
Remove
1. A fter first purging the system of refrigerant, remove
the clutch plate and hub assembly and shaft key as described
in "Compressor Clutch Plate and H ub Asm." Removal
procedure.
2. Pry out the sleeve retainer and remove the absorbent
sleeve. Remove the shaft seal seat retaining ring, using Snap-
Ring Pliers J-5403 (# 2 1 ). See Fig. 18.
3. Thoroughly clean inside of compressor neck area
surrounding the shaft, the exposed portion of the seal seat
This is absolutely necessary to
and the shaft itself.
prevent any dirt or foreign material from getting
into compressor .
4. Place Seal Protector J-22974 over the end o f the shaft
to prevent chipping the ceramic seat. Fully engage the
knurled tangs of Seal Seat Remover-Installer J-23128 into
the recessed portion of the seal seat by turning the handle
clockwise
. Lift the seat from the compressor with a
rotary motion (Fig. 19).
CAUTION: DO N O T tighten the handle with a
wrench or pliers; however, the handle m ust be
hand-tightened securely to remove the seat.
5. W ith Seal Protector J-22974 still over the end of the
shaft, engage the tabs on the seal assembly with the tangs
1B-7
ELECTRICAL
TERMINALS
T H E SH A FT SEAL