Compressor Pressure Relief Valve Or Pressure Switch; Assembly) - Chevrolet 1980 Light Duty Truck Repair Manual

LEAK TE ST
ADAPTER
J-9625
Figure 1D-25 Leak Testing A-6 Compressor
or similar instrument, carefully spread the sleeve until the
ends o f the sleeve butt at the top vertical centerline.
10. Position the new m etal sleeve retainer so that its
flange face w ill be against the front end o f the sleeve. Pulley
Puller Pilot J-9395 (see Figure ID -13) m ay be used to install
the retainer. Press and tap w ith a mallet, setting the retainer
and sleeve into place (retainer
approxim ately 1/32" from the face o f the com pressor neck).
(See Figure ID -24).
11. Reinstall the Clutch Plate and Hub assembly as
described in "A-6 Com pressor Clutch Plate and Hub
Assembly" R eplacem ent procedure.
AIR CO NDITIO NING COMPRESSOR OVERHAUL ID-11
OIL DR A IN FITTING
should be recessed
Some compressor
shaft seal leaks may be the result of mispositioning of
the axial plate on the
m ispositioning o f the axial plate m ay be caused by improper
procedures used during pulley and driven plate removal,
pounding, collisions or dropping the compressor. If the axial
plate is m ispositioned, the carbon face o f the shaft seal
assembly m ay not contact the seal seat and the rear thrust
races and bearing m ay be damaged.
To check for proper positioning o f the axial plate on
the shaft, rem ove the clutch driven plate and measure the
distance between the front head extension and the flat
shoulder on the shaft as shown in Figure ID -24. To measure
this distance, use a wire gage
between .026" and .075").
back in the axial plate (m easurem ent greater than .075"),
disassemble the com pressor and replace the shaft and axial
plate assembly rear thrust races and thrust bearing.
If there also appears to be too m uch or insufficient air
gap between the drive and driven plates, dislocation o f the
shaft should be suspected. If the carbon seal is not seating
against the seal seat, it will not be possible to com pletely
"Evacuate the System"
D IS C H A R G IN G , A D D I N G OIL, 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.
12. "Add Oil, Evacuate and Charge System" (see
D IS C H A R G IN G , A D D I N G OIL, 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).
A-6 COMPRESSOR PRESSURE RELIEF
VALVE OR PRESSURE SWITCH
W hen necessary to replace the Pressure R elief Valve (or
Pressure Switch if so located), located in the com pressor
rear head casting (Figure ID -26 and Figures ID -27 and 28),
the valve/sw itch assem bly
P U R G IN G T H E SYSTEM O F R E F R IG E R A N T . A new
valve/sw itch and O-ring
refrigerant oil should be installed (see D IS C H A R G IN G ,
A D D IN G OIL, E V A C U A T IN G
P R O C E D U R E S F O R C.C.O.T. A /C SYSTEM S in the
A IR C O N D IT IO N IN G section).
A-6 COMPRESSOR INTERNAL
M E C H A N IS M (CYLINDER AND SHAFT

ASSEMBLY)

Service operations to the A -6 com pressor Rear H ead
or Internal M echanism
com pressor should be performed with the system P U R G E D
O F R E F E R IG E R A N T 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
P R O C E D U R E S FO R C.C.O.T. A /C SYSTEM S in the
A IR C O N D IT IO N IN G section. The com pressor must also
be removed from the vehicle to insure that the necessary
degree o f cleanliness may be m aintained. Additionally,
"Compressor Clutch Plate and Hub, Pulley and Bearing,
Clutch Coil and H ousing and Shaft Seal" Rem oval
procedures, as described earlier in the O V E R H A U L
section, all are to have been followed. Clean hands, clean
tools and a clean bench, preferably covered with clean
paper, are o f extrem e importance.
compressor shaft.
The
(the clearance should be
If the shaft has been pushed
as outlined under
FO R C.C.O.T. A /C
FO R C.C.O.T. A /C
should be removed after
coated with 525 viscosity
A N D C H A R G IN G
Cylinder and Shaft) o f the
A N D C H A R G IN G