GMC 1982 Light Duty Truck Service Manual page 99

R-4 AIR CONDITIONING COMPRESSOR
For Compressor REMOVAL AND INSTALLATION, see
Air Conditioning Section. For DISCHARGING, ADDING
OIL, EVACUATING AND CHARGING PROCEDURES
Minor R-4 Compressor Repair Procedures..................................................................................................................1C 1-1
Compressor Clutch Plate and Hub Assy................................................................................................................ ..1C1-2
Compressor Clutch Rotor and/or Bearing...............................................................................................................1C 1-2
Replace Rotor and Bearing Assembly (On Car)............................................................................................... ..1C 1-4
Replace Rotor and Bearing Assembly (On Bench)........................................................................................... ..1C1-4
Compressor Clutch Coil and /o r Pulley R im ....................................................................................................... ..1C1-7
Compressor Inertia Ring Installation........................................................................................................................1C 1-8
Major R-4 Compressor Repair Procedures...................................................................................................................1C1-10
Compressor Shaft Seal................................................................................................................................................1C1-10
Seal Leak Detection.................................................................................................................................................1C1-10
Compressor Shaft Seal Replacement (On Car).................................................................................................. .1C1-11
Compressor Shaft Seal Replacement (Off C ar)................................................................................................. .1C1-11
Compressor Pressure Relief Valve........................................................................................................................... .1C1-11
Compressor Front Head and/or O-Ring..................................................................................................................1C1-13
Compressor Thrust and Belleville Washers..............................................................................................................1C1-14
Compressor Main Bearing..........................................................................................................................................1C1-14
Compressor Shell and/or O-Rings.......................................................................................................................... ..1C1-15
Compressor Discharge Valve Plate and/or Retainer............................................................................................ ..1C 1-16
Compressor Cylinder and Shaft Assy........................................................................................................................1C1-16
Comp. Leak Testing (External and Internal)........................................................................................................ ..1C1-17
For all practical purposes, all vehicles make use of the same
4 cylinder air conditioning compressor. Actual differences between
compressor installations are in their mounting brackets, drive
system, pulleys, connector assemblies and system capacities, none
of which will affect the following Overhaul Procedures.
,
When servicing the compressor, it is essential that steps be
taken to prevent dirt or foreign material from getting on or into
the compressor parts and system during disassembly or
reassembly. Clean tools and clean work area are very important
for proper service. The compressor connection areas and the
exterior of the compressor should be cleaned off as much as
possible prior to any "on car" repairs or removal of the compressor
for workbench service. The parts must be kept clean at all times
and any parts to be reassembled should be cleaned with
trichloroethane, naphtha, Stoddard solvent, kerosene or equivalent
solvent and dried off with dry air. When necessary to use a cloth
on any part, it should be of a non-lint producing type.
A1, ,
Although certain service operations can be performed
without completely removing the compressor from the vehicle, the
operations described herein are based on bench over-haul with the
compressor removed from the vehicle. They have been prepared
in sequence in order of accessibility of the components. Pad fender/
skirt and secure compressor near top of fender skirt with wire,
rope, etc. when performing on-car service.
When the R-4 compressor is removed from the vehicle for
servicing, the amount of oil remaining in the compressor should
be drained and measured. This oil should then be discarded and
new 525 viscosity refrigerant oil added to the compressor (See
Refrigerant Oil Distribution" in the Air Conditioning Section
1B1).
SECTION 1C1
OVERHAUL
CONTENTS
6
.
,
r , r
AIR C O N D ITIO N IN G COMPRESSOR O VERHAUL 1C1-1
FOR C.C.O.T. A/C SYSTEMS, see Air Conditioning
Section.
M I N O R R E P A I R P R O C E D U R E S , R - 4
P O M P R E 9 S O R
V / U l v i r n c o o U n
c n n n w i w r
. . -LOWING
COMPRESSOR CLUTCH PLATE AND HUB, ROTOR AND
, BEARING, AND COIL & PULLEY RIM ARE COVERED AS
"MINOR" BECAUSE THEY MAY BE PERFORMED WITHOUT
FIRST PURGING THE SYSTEM OR REMOVING THE
Two types of drive systems are used on the R-4 Compressor:
V-groove type and poly groove type. The drive system affects only
minor repair procedures and is so noted where required. Major
repair procedures are not affected by the drive system type,
Compressor Shaft Seal ^sembly, and Pressure Relief
COMPRESSOR from the vehicle but these operations are covered
later in this section as Major Repair Procedures because the
system MUST FIRST BE PURGED of Refrigerant-12.
Illustrations used in describing these operations show the
compressor removed from the vehicle only to more clearly
When servicing the compressor, remove only the necessary
components that preliminary diagnosis indicates are in need of
service. Refer to the AIR CONDITIONING section and Fig. 1C1-
3 and Fig. 1C1-4 for information relative to parts nomenclature
an(j ioca^ on
Removal and installation of external compressor components
and disassembly and assembly of internal components must be
performed on a clean workbench.The work area, tools and parts
must be kept clean at all times.
h d p d a tih m q m
OPERATIONS TO
COMPRESSOR FROM THE VEHICLE,
serviced WITHOUT REMOVING THE
illustrate the various operations.
t u p
a
a
THE R-4
. .