Pontiac Fiero 1988 Service Manual page 84

H R - 6 A I R C O N D I T I O N I N G C O M P R E S S O R 1
©WE^HAUL
CONTENTS
G e n e r a l I n f o r m a t i o n i
Metric Thread Size Information.... 1
S e r v i c e P r o c e d u r e s
Minor HR-6
Compressor
Repair
Procedures
2
Compressor
Clutch
Plate
and Hub
Assembly
2
Compressor Clutch Rotor and/or
Bearing 5
Compressor Clutch Coil 7
Major HR-6 Compressor Repair
Procedures 9
Compressor
Shaft
Seal Replacement...
9
Seal Leak Detection
9
G E N E R A L INFORMATION
The HR-6 Automotive Conditioning Compressor and
Clutch Assembly is a lightweight, six cylinder axial design
consisting of three double ended pistons and weights 5.8 kg
(12.7 lbs.).
G O THIN TORQUE
CUSHION
Fig. 1 HR-6 Clutch Driver Designs
Although the HR-6 compressor is the same for all
vehicle applications, there are differences in installations,
mounting brackets, pulleys, torque cushions and switches,
none ofwhich will affect the following overhaul procedures.
There are two ( 2 ) clutch driver designs for the HR-6
compressor. The clutch driver without a torque cushion and
the clutch driver having a thin torque cushion (Fig. 1).
Note: When servicing clutch drivers w i t h a torque cushion,
the clutch hub holding tool
J-25030
is used in place of
J-33027.
Service compressors are supplied w i t h either the
control switches assembled in the rear head or a plug may be
found where a control switch is required. If the service
compressor requires control switches, the plug may be
removed from the appropriate rear head switch cavity of the
replaced compressor and assembled as prescribed in this
manual.
Compressor Pressure Relief Valve 11
Compressor Rear Head, Head Gasket,
Rear Valve Plate, Suction Reed Plate
and Cylinder to Rear Head O-Ring. 11
Compressor Front Head, Head Gasket,
Front Valve Plate, Suction Reed Plate
and Cylinder to Front
Head O-Ring 13
Compressor Cylinder &
Shaft
16
Compressor Center Cylinder Seal 18
Compressor Leak Testing (External
and Internal) 19
HR-6 Compressor Special Tools 20
When servicing the compressor, keep dirt or foreign
material from getting on or into the compressor parts and
system. Clean tools and a clean work area are important for
proper service. The compressor connections and the
outside of the compressor should be cleaned before any
"on car" repairs, or before removal of the compressor. The
parts must be kept clean at all times and any parts to be
reassembled should be cleaned w i t h R-l 1, Trichloroethane,
Naphtha, Stoddard solvent, kerosene or equivalent and dried
w i t h dry air. When necessary to use a cloth on any part, it
should be of a non-lint producing type.
The operations described below are based on bench
overhaul w i t h the compressor removed from the car,
except as noted. They have been prepared in order of
accessibility of the components. When a compressor is
removed from the car for servicing, the amount of oil
remaining in the compressor should be drained, measured
and recorded. This oil should then be discarded and an
equal amount of new 525 viscosity refrigerant oil added to
the compressor.
Note: The service compressor is shipped w i t h 8 oz. of 525
viscosity refrigerant oil. This oil should be drained and
retained for replacement oil when service procedures
require addition of new oil to compressor.
Most minor repair procedures may be done on the car
without discharging the system. Major repair procedures
require that the system be discharged of refrigerant.
M E T R I C T H R E A D S I Z E INFORMATION
1. Compressor to mounting bracket bolts.
Front M 10x1.5 - 6H
Rear M8xl.25 - 6H
2. Suction-discharge port screw.
M l Ox 1.5 - 6H
3. Compressor
shaft.
M9xl.25 - 6H
4. Internal hub-clutch drive assembly.
M22xl.5 - 6H