Opel 1900 1973, Service Manual

Page: 543 / 625

1973 OPEL MANUAL
Figure Compressor Front and Rear Heads
and circulated through the system via a inch
diameter oil passage through the shaft center and
also four
inch diameter holes drilled perpen-
dicular to the shaft. The inner rotor is driven by the
shaft.
TUBE
Figure Compressor Oil Flow
4. Shaft and Plate Assembly The shaft and
plate assembly (see Figure consists of
an elliptical plate positioned obliquely to the shaft.
As the plate and shaft rotate, the surface of the plate
moves to and fro lengthwise relative to the centerline
of the shaft. This reciprocating motion is transmitted
to the pistons which contact the surface of the
plate. A woodruff key locks the
plate onto the
shaft. The plate and shaft are serviced as an
assembly. The shaft is driven by a pulley when the
magnetic clutch is energized. A needle thrust bearing
and mainshaft bearing support the shaft horizon-
tally and vertically.
5. Needle Thrust Bearing and Races Two needle
thrust bearings, each “sandwiched” between two
races are located on either side of the
plate
hub. The front needle thrust bearing and races pro-
vide 0.010” to 0.015” clearance between the top of
the pistons and the rear side of the front suction valve
reed disc (see Figure
The rear needle thrust
bearings and races provide 0.0005” to 0.0015” clear-
ance between the hub of the
plate and the rear
hub of the rear cylinder. Races of various thicknesses
are provided for service replacement to achieve re-
quired clearances when rebuilding units.
6. Cylinder Assembly and service Pistons (Factory
installed pistons are ringless) -The cylinder assembly
(front cylinder and rear cylinder) is serviced only
a matched set. Alignment of the two halves is main-
tained by two dowel (locater) pins.
The double ended pistons are made of cast alumi-
num. There are two grooves on each end of the ser-
vice piston. The outer grooves will receive a piston
ring. The inner grooves act as oil scraper grooves
collect any excess oil. Two oil return holes are drilled