R-4 Compressor Shaft Seal; Seal Leak D E Te C Tio N - Chevrolet 1980 Light Duty Truck Repair Manual

disassembly o f the internal R -4 com pressor cylinder and
shaft assembly.
If the R -4 Compressor Internal Cylinder and Shaft
A ssem bly is to be serviced or replaced, then the oil in the
R -4 com pressor m ust be drained, measured and replaced
according to "C.C.O.T. Refrigerant Oil Distribution" in the
A ir Conditioning section to determine addition o f proper oil
quantity to new assembly.
A clean workbench, preferably covered with a sheet o f
clean paper, orderliness in the work area and a place for all
parts being rem oved and replaced is o f great importance, as
is the use o f the proper, clean service tools. A ny attempt to
use m ake-shift or inadequate equipment may result in
damage a n d /o r improper com pressor operation.
These procedures are based on the use o f the proper
service tools and the condition that an adequate stock o f
service parts is available. A ll parts required for servicing the
internal com pressor are protected by a preservation process
and packaged in a manner which w ill elim inate the necessity
o f cleaning, washing or flushing o f the parts. The parts can
be used in the internal assembly just as they are removed
from the service package.

R-4 COMPRESSOR SHAFT SEAL

Seal Leak Detention
A shaft seal should not be changed because o f an oil-
line on the hood insulator. The Seal is designed to seep som e
oil for lubrication purposes. Only change a Shaft Seal when
a leak is detected by evidence o f oil sprayed in large am ounts
and then only after actual refrigerant leakage is determined
by test.
Should an R -4 Compressor Shaft Seal ever have to be
replaced because it was determined to be the cause o f
excessive signs o f oil leakage in the A /C system , then the
accum ulator in this R -4 system m ust also be removed from
the vehicle; the oil in the accum ulator then must be drained,
measured and replaced according to "C.C.O.T. Refrigerant
Oil Distribution" in the Air Conditioning section to
determ ine oil loss.
R-4 COMPRESSOR SHAFT SEAL
REPLACEMENT
Remove (On Car)
1. "Discharge the Refrigerant System" according to the
D IS C H A R G IN G , A D D IN G O IL, E V A C U A T IN G A N D
C H A R G IN G P R O C E D U R E S
SYSTEM S in the A IR C O N D IT IO N IN G section.
2. Loosen and reposition com pressor in m ounting
brackets.
3. R em ove Clutch Plate and Hub assembly from
com pressor as described in "R-4 Compressor Clutch Plate
and Hub Assembly" R em oval procedure.
4. R em ove the shaft seal seat retainer ring using Snap
R ing Pliers J-5403 # 2 1 ) . See Figure ID -21.
5. Thoroughly clean inside o f com pressor neck area
surrounding the shaft, the exposed portion o f the seal seat
This is absolutely necessary to
and the shaft itself.
prevent any d irt or foreign material from getting
into compressor.
AIR CO NDITIO NING COMPRESSOR OVERHAUL 1 D-35
F O R C.C.O.T. A /C
6. Place Seal Protector J-22974 over the end o f the shaft
to prevent chipping the ceram ic seat. Fully engage the
knurled tangs o f Seal Seat R em over-Installer J-23128 into
the recessed portion o f the seal seat by turning the handle
clockwise.
R em ove the Seal Seat from the compressor w ith
a rotary-pulling m otion (Figure IB-93). D iscard the Seat.
NOTICE:
D O N O T tighten the handle with a wrench
or pliers; however, the handle m ust be hand-tightened
securely to rem ove the Seat.
Figure 1D-93 Removing R-4 Ceramic Seal Seat (On Car)
7. W ith Seal Protector J-22974 still over the end o f the
shaft, set Seal Rem over-Installer J-9392 down onto shaft
clockwise, while pressing down
end, turning
Rem over tangs with the tabs on the Seal assembly. Then lift
the Shaft Seal assembly out (see Figure IB-94). Discard the
Seal.
Figure 1D-94 Removing R-4 Seal (On Car)
8. R em ove and discard the seal seat O-ring from the
compressor, neck using O -R ing R em over 9553 (Figure 1D-
95).
9. R echeck the shaft and inside o f the com pressor neck
for dirt or neck foreign m aterial and be sure these areas are
perfectly clean before installing new parts.
Inspection
Seals should not be re-used. A lw ays use a new
specification service seal kit on rebuild (see Figure ID -20).
Be extrem ely careful that the face o f the Seal to be installed
is not scratched or damaged in any way. M ake sure that the
C f 'R A . M I C
SEAL j
SEAT I
to engage