Opel 1900 1973 Service Manual page 544

SHOES ARE USED
TO GIVE
TO .OOlO
THRUST UNIT CONTROLS
RUNNING CLEARANCE
Figure 98-28 Compressor Needle Thrust Bearings and
into the scraper grooves and allow oil to drain back
into the reservoir.
7. Shoe Discs - The shoe discs are made of bronze
and act as a bearing between the ball and the wash
plate. An oil circulation hole is provided through the
center of each shoe for lubrication purposes. These
shoes are of various thicknesses and are provided in
0.0005 inch increments. Ten sizes are available for
service replacement. A basic "zero" shoe size is
available' for preliminary gauging procedures when
rebuilding a cylinder assembly.
8. Suction Passage Cover-The suction passage cover
fits over a suction passage (see Figure 9B-30) in the
body of the cylinder assembly. Low pressure vapor
S U C T I O N
Figure 98-30 Suction Passage and Discharge Tube
REFRIGERANT COMPONENTS ALL MODELS
THRUST UNIT
CONTROLS PISTON
HEAD CLEARANCE
TUBE
flows from the suction port through the suction pas-
sage in the cylinder assembly, and into the suction
cavity of the front head.
9. Discharge Tube - The discharge tube is used to
connect the discharge cavity in the front head with
the discharge cavity in the rear head. High pressure
vapor discharge is channeled via the tube to the dis-
charge cavity and port. A slightly modified discharge
tube is provided to be used as a service replacement
(see Figure 9B-31). The service replacement tube has
a reduced end and a built up shoulder to accomodate
an "0" ring and bushing. These added parts achieve
the necessary sealing of the high pressure vapor
within the compressor.
Figure 98.31 Service
Replacement
10. Pressure Relief Valve - The purpose of the pres-
sure relief valve is to prevent the discharge pressure
from exceeding 440 psi. Opening of the pressure re-
lief valve will be accompanied by a loud popping
noise and the ejection of some refrigerant from the
valve. If the pressure relief valve is actuated due to
excessive pressures in the compressor, the cause of
the malfunction should be corrected immediately.
The pressure relief valve is located on the rear head
of the compressor.
11. Shell and Oil Drain Screw - The shell of the
compressor contains a reservoir which furnishes a
continuous supply of oil to the moving parts of the
compressor. A batTIe plate covers the reservoir and
DISCHARGE
TUBE
Discharge Tube