M Ajor A-6 Com Pressor Repair Procedures; A - 6 C O M P R E S S O R S H A F T S E A L; Seal Leak D Etection; Com Pressor Cylinder And Shaft A Ssem Bly - GMC 1982 Light Duty Truck Service Manual

ID -8 AIR CONDITIONING COMPRESSOR OVERHAUL
M A J O R A-6 C O M P R E S S O R REPA IR P R O C E D U R E S
Service repair procedures to the Compressor Shaft
Seal, Pressure Relief Valve, or disassembly of the
Internal Compressor Cylinder and Shaft Assembly are
considered "M A J O R " SIN CE THE REFRIGERATION
SY STEM M U ST BE COMPLETELY
REFRIGERANT before proceeding and/or because
major internal operating and sealing components of the
compressor are being disassembled and serviced.
Should an A-6 com pressor, it's com pressor shaft seal,
or any other com ponent ever be removed for servicing
because it was determ ined to be the cause of excessive signs
of oil leakage in the A-6 A /C system, then the oil in the
com pressor m ust be drained, m easured and replaced
according to "C.C.O .T. Refrigerant Oil D istribution" in the
A ir Conditioning section to determ ine oil loss. The
accum ulator in this A-6 system m ust then also be removed
- oil drained - measured, etc. according to same section.
W hen replacing the shaft seal assembly (Fig. I D - 17),
pressure relief valve (Fig. ID -23), even if the com pressor
rem ains on the vehicle during the operation, it will be
necessary to purge the system of refrigerant as outlined in
the A ir C onditioning section (see " Discharging, A dding Oil,
Evacuating and C harging Procedures for C.C.O.T. A /C
Systems"). The same holds true for any disassembly of the
internal A-6 com pressor cylinder and shaft assembly.
If the A-6 Com pressor Internal Cylinder and Shaft
Assembly is to be serviced or replaced, then the oil in the
com pressor m ust be drained, m easured and replaced
according to " C.C.O.T. R efrigerant Oil D istribution" in the
A ir Conditioning section to determ ine addition of proper oil
quantity to new assembly.
A clean w orkbench, preferably covered w ith a sheet of
clean paper, orderliness in the w ork area and a place for all
parts being rem oved and replaced is of great im portance, as
is the use o f the proper, clean service tools. A ny attem pt to
use m ake-shift or inadequate equipm ent m ay result in
dam age a n d /o r im proper com pressor operation.
These procedures are based on the use of the proper
service tools and the condition th at an adequate stock of
service parts is available. All parts required for servicing the
internal com pressor are protected by a preservation process
and packaged in a m anner w hich will elim inate the necessity
of cleaning, washing or flushing of the parts. The parts can
be used in the internal assembly ju st as they are removed
from the service package.
Piston shoe discs and shaft thru st races will be
identified by "num ber" on the parts themselves for reference
to determ ine their size and dim ension (see Fig. ID-41).

A - 6 C O M P R E S S O R S H A F T S E A L

S E A L L E A K D E T E C T IO N
A SHAFT SEAL SHOULD NOT BE CHANGED
BECAUSE OF AN OIL-LINE
INSULATOR. The Seal is designed to seep some oil for
lubrication purposes. Only change a Shaft Seal when
a leak is detected by evidence of oil sprayed in LARGE
AM O U N TS and then only after actual refrigerant
leakage is determined by testing with a Leak Detector
J 2 3 4 0 0 .
E V ER H A V E TO BE R E P L A C E D BECA U SE IT WAS
D E T E R M IN E D TO BE
SIG N S OF OIL LEAKAGE
PURGED OF T H E O IL IN T H E A-6 C O M PR ESSO R M U ST BE
D R A IN E D ,
"C.C.O.T. R efrigerant Oil D istribution" in the A IR
C O N D IT IO N IN G section to determ ine oil loss. T H E
A C C U M U L A T O R IN T H IS A-6 SYSTEM M U ST T H E N
ALSO be removed - oil drained - m easured, etc. according
to same section.
Fig. 1D-17 Specification A-6 and R-4 Compressor Shaft Seal
Rem ove
discharging, adding oil, evacuating and charging procedures
for C.C.O.T. A /C systems in the A ir C onditioning section.
key as described in "A-6 Com pressor C lutch Plate and H ub
A sm ." removal procedure.
sleeve. Remove the shaft seal seat retaining ring, using Snap-
Ring Pliers J 5403. See Fig. I D - 18.
surrounding the shaft, the exposed portion of the seal seat
and the shaft itself. This is absolutely necessary to prevent
any dirt or foreign m aterial from getting into compressor.
to prevent chipping the ceram ic seat. Fully engage the
knurled tangs of Seal Seat Rem over-Installer J 23128 into
the recessed portion of the seal seat by turning the handle
clockwise. Remove the Seal Seat from the com pressor with
ON THE HOOD
a rotary-pulling m otion (Fig. ID -19). D iscard the Seat.
however, the handle m ust be hand-tightened securely to
remove the Seat.
shaft, set Seal Rem over-Installer J 9392 dow n over shaft
SH O U L D A N A-6 CO M PR ESSO R S H A F T SEA L
THE CAUSE OF EXCESSIVE
IN T H E A /C SYSTEM , T H E N
m easured and
S P E C I F I C A T I O N P A R T S
S E A L
S E A T
O - R IN G S
Kit
1. " D ischarge the Refrigerant System " according to the
2. Rem ove the clutch plate and hub assembly and shaft
3. Pry out the sleeve retainer and remove the absorbent
4. T horoughly clean inside o f com pressor neck area
5. Place Seal P rotector J 22974 over the end of the shaft
D o not tighten the handle w ith a wrench or pliers;
6. W ith Seal P rotector J 22974 still over the end of the
replaced according to
C A R B O N M A T E R I A L .
L A R G E C H A M F E R O N
I N S I D E D I A M T E R .
C E R A M I C M A T E R I A L
W I T H P O L IS H E D
F A C E .
N E O P R E N E , T H U S
C A P A B L E O F
G I V I N G H E A T
R E S IS T A N C E A N D
L IF E E X P E C T A N C Y .
200 85 8