GMC 1990 Light Truck Repair Manual page 59

R-4 AIR CONDITIONING COMPRESSOR
SUBJECT
R-4 Air Conditioning Compressor............................................................................................................................... 1B3- 1
General Description.................................................................................................................................................. 1B3- 1
Identification...............................................................................................................................................................1B3- 2
Disassembly of The Drive Components....................................................................................................................... 1B3- 2
Clutch Drive H u b ........................................................................................................................................................ 1B3- 2
4 Pole Clutch Rotor And/Or Bearing-V-Groove...................................................................................................... 1B3- 2
6 Pole Clutch Rotor And/Or Bearing......................................................................................................................... 1B3- 3
Clutch Coil And/Or Pulley R im ................................................................................................................................. 1B3- 4
Disassembly Of The Com pressor............................................................................................................................... 1B3- 6
Pressure Relief V a lv e ................................................................................................................................................1B3- 6
High Side High Pressure Cutoff Sw itch...................................................................................................................1B3- 6
Front Head And Main Bearing................................................................................................................................... 1B3- 6
Compressor S h e ll...................................................................................................................................................... 1B3- 6
Discharge Valve Plate................................................................................................................................................ 1B3- 7
Cleaning And Inspection.............................................................................................................................................. 1B3- 9
Cleaning....................................................................................................................................................................... 1B3- 9
Inspection...................................................................................................................................................................1B3- 9
Compressor Assembly.................................................................................................................................................. 1B3- 9
Discharge Valve Plate................................................................................................................................................ 1B3- 9
Compressor S h e ll...................................................................................................................................................... 1B3- 9
Front Head And Main Bearing................................................................................................................................... 1B3- 9
High Side High Pressure Cutoff Sw itch...................................................................................................................1B3-10
Pressure Relief V a lv e ................................................................................................................................................ 1B3-10
Assembly of Drive Components................................................................................................................................... 1B3-10
Shaft Seal..................................................................................................................................................................... 1B3-10
Clutch Coil And/Or Pulley R im ................................................................................................................................. 1B3-10
6 Pole Clutch And/Or Bearing................................................................................................................................... 1B3-11
4 Pole Clutch Rotor And/Or Bearing-V-Groove...................................................................................................... 1B3-12
Clutch Drive H ub........................................................................................................................................................ 1B3-13
Leak Testing...................................................................................................................................................................1B3-14
Specifications.................................................................................................................................................................1B3-15
R-4 AIR CONDITIONING COMPRESSOR
GENERAL DESCRIPTION
The Harrison R-4 compressor is a four cylinder, radial
opposed type with 10 cubic inch displacement.
There are two designs of the clutch driver which affect
the overhaul procedure: The four pole clutch and the six
pole clutch (figures 1 and 2). There are also two types of
pulleys used with the R-4 which also affect some proce­
dures.
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 disas­
sembly or assembly. Clean tools and clean work area are
R-4 AIR CONDITIONING COMPRESSOR 1B3-1
SECTION 1B3
CONTENTS
very important for proper service. The compressor connec­
tion areas and the exterior of the compressor should be
cleaned off as much as possible prior to any repairs. Parts
must be kept clean at all times and any parts to be reassem­
bled should be cleaned with trichloroenthane, naphtha,
stoddard solvent, kerosene or equivalent solvent and
blown dry with dry air. When necessary to use a cloth on
any part, it should be of a nonlint producing type.
When the compressor is removed from the vehicle the oil
in the compressor must be drained and measured. The oil
should then be discarded. If less than 30 ml (1 oz.) is
drained from the compressor add 60 ml (2 oz.) of new 525
viscosity oil to the assembly after overhaul. If more than
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