Service Procedures . Compressor Assembly - Pontiac FIREBIRD 1972 Service Manual

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1972 PONTIAC SERVICE MANUAL
a. All hose ends must be cut off straight.
migrated to other parts of the system can be determined
by subtracting the amount drained from the original oil
b. Hose clamps must be properly installed as in- charge of 11 fluid ozs. The amount of oil equal to this loss
dicated by -the locating tab oi each clamp and must be drained from the new compressor before it is
torqued to 40 lbs. in. with a torque wrench.
installed.
c. When installing a fitting, the hose must be seated
against the shoulder on the fitting.
d. All repaired hose assemblies must be equal in
length to the original assembly. Use necessary
fittings and hose to make the repair without
changing the length and/or contour of the hose
assembly. This is particularly important on hose
assemblies which are routed through or near
sheet metal to avoid possible chafing of the hose.
4. Re-install hose assemblies and tighten all connec-
tions.
5. Evacuate, charge and leak test refrigerant system.
COMPRESSOR ASSEMBLY
REMOVE AND REPLACE
Some replacement parts do not require removing the com-
pressor for replacement. Operations which can be per-
formed without compressor removal or discharging the
refrigerant system are:
1. Compressor drive belt.
2. Compressor clutch hub and drive plate.
3. Compressor pulley and/or bearing.
4. Compressor clutch coil.
The compressor shaft seal and seat and associated parts
require depressurizing the system for replacement but
compressor removal is not necessary.
For replacement of the above components refer to SER-
VICE PROCEDURES
-
COMPRESSOR ASSEMBLY.
SERVICE PROCEDURES
-
COMPRESSOR
ASSEMBLY
The compressor, when removed, must be closed immedi-
ately. If the system has been or can be operated for more
than two minutes, circulation of oil from compressor to
other components of system will require adjustment of the
oil charge in the new compressor as explained under RE-
PLACING COMPONENTS OTHER THAN COM-
PRESSOR.
After draining and measuring the oil from crankcase and
head of the compressor removed, the amount that has
INSTALLING COMPRESSOR
Idle (on car) compressor to be replaced for 10 minutes at
1500-2000 engine rpm, at maximum A/C and blower at
high speed. D O NOT add any more oil to the compressor
than is necessary or maximum cooling will be reduced.
Compressor replaced with new compressor:
1. Remove compressor and plack in a horizontal posi-
tion with drain plug downward, drain compressor,
measure quantity of oil drained and discard oil.
2. Drain oil from replacement compressor and save it.
3. If amount of oil drained in step 1 is more than 4 ozs.,
place into the new compressor the same amount of oil
drained from the replaced compressor.
If amount of oil drained in step 1 is 4 ozs. or less,
place 6 ozs. of oil in the replacement compressor.
4. Install compressor.
Compressor replaced with a field repaired (overhauled)
compressor:
1. Follow procedure for replacement with new com-
pressor.
2. Add one additional ounce of oil. (More oil is retained
in a drained compressor than one that has been re-
built.)
REPLACING AN INOPERATIVE COMPRESSOR
In the event it is not possible to idle the compresser to be
replaced to effect oil return to it, the following will apply:
1. Remove compressor from car, drain and measure the
oil.
2. If amount of oil drained is more than 1- 1/2 fluid ozs.,
subtract this amount from the original oil charge of
11 ozs. to obtain "oil loss". If little or no oil has been
lost from the system (major leak not indicated), drain
amdunt of oil loss from the new compressor assern-
bly.
.
EXAMPLE: If 3 1/2 ozs. of oil were drained from an
inoperative compressor, the oil loss would be 7 1/2
ozs. (1 1
-
3 1/2) and 7 1/2 ozs. would be drained from
the new compressor.