Opel 1900 1973, Service Manual, Page: 545 / 625

1 9 7 3 O P E L S E R V I C E M A N U A L
S P A C E R
R E T A I N E R
R I N G
CLUTCH
COIL HOUSING
TO HEAD
RING
SHAFT NUT
CLUTCH DRIVEN
P L A T E
BEARING TO PULLEY PULLEY
RETAINER RING
COIL HOUSING
CLUTCH DRIVE P L A T
IRETAINER RING
AND PULLEY ASSEMBLY
Figure Magnetic Clutch and Pulley Assembly
is tack-welded to the inside of the shell. In addition,
an oil drain screw and gasket are located on the side
of the reservoir and are provided for draining or
adding of oil to system. To add oil, compressor must
be removed from car. The necessity to add oil should
only be required when the system has ruptured vio-
lently and oil has been lost along with refrigerant.
Under controlled conditions or slow leak conditions
it is possible to loose only a small amount of oil with
the refrigerant gas. The serial number, part or
model
number, and rating of the compressor is stamped on
name plates located on top of shell.
12. Magnetic Clutch and Pulley Assembly The
magnetic clutch and pulley assembly (see Figure
32) together transmit power from the engine crank-
shaft to the compressor. The magnetic clutch is
actuated
when the air conditioning temperature
switch and the fan switch located on the evaporator
cover assembly are closed. When the switches are
closed, the coil sets up a magnetic field and attracts
the armature plate (movable element of the clutch
driven plate). The armature plate portion of the
clutch driven
plate moves forward and contacts the
friction surface of the pulley assembly, thereby me-
chanically linking the compressor to the engine. The
compressor will operate continuously whenever the
air conditioner clutch compressor switch and the fan
switch are closed. When one or both of the switches
are open the armature plate will be released due to
spring tension and move away from the pulley
as-
sembly. This allows the pulley to rotate without driv-
ing the shaft. It should be noted that if the air
conditioner system was in use when the engine was
turned off, the armature plate may remain in contact
with the pulley due to residual magnetism. When the
engine is started the armature plate will separate
from the pulley assembly. The coil is rated at 3.85
ohms (85 degrees F.) and will
draw 3.2 amperes at
12
volts D.C.
Condenser
The condenser which is made of aluminum is located
DESICCANT.
RECEIVER
DEHYDRATOR
ASSEMBLY
FILTER
S C R E E N
Figure Receiver Assembly