Isuzu 2000 Trooper UX, Workshop Manual

Page: 105 / 2150

1A–76 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
6. Remove any excess oil resulting from installing the
new seal parts from the shaft and inside the
compressor neck.
7. Install the clutch plate and hub assembly as
described previously.
8. Reinstall compressor belt and tighten bracket.
9. Evacuate and charge the refrigerant system.
Compressor Pressure Relief Valve
Removal
1. Recover the refrigerant using Refrigerant Recovery
System.
2. Remove old pressure relief valve.
Installation
1. Clean valve seat area on rear head.
2. Lubricate O-ring of new pressure relief valve and
O-ring assembly with new 525 viscosity refrigerant
oil. Install new valve and torque in place, 9.0 N·m
(6.1 ft lbs)
3. Evacuate and recharge the system.
4. Leak test system.
Compressor Oil
Compressor Oil Check
The oil used to lubricate the compressor is circulating with
the refrigerant.
Whenever replacing any component of the system or a
large amount of gas leakage occurs, add oil to maintain
the original amount of oil.
(Oil Capacity)
Capacity total in system 150 cc (5.0 fl.oz)
Compressor (Service
parts) charging amount 150 cc (5.0 fl.oz)
Checking and Adjusting Oil Quantity
for Used Compressor
1. Perform oil return operation. Refer to Oil Return
Operation in this section.
2. Discharge and recover refrigerant and remove the
compressor.
3. Drain the compressor oil and measure the extracted
oil with a measuring cylinder.
4. If the amount of oil drained is much less than 90 cc
(3.0 fl. oz.), some refrigerant may have leaked out.
Conduct a leak tests on the connections of each
system, and if necessary, repair or replace faulty
parts.
5. Check the compressor oil contamination. (Refer to
Contamination of Compressor Oil in this section.)
6. Adjust the oil level following the next procedure
below.
(Collected Amount) (Charging Amount)
more than 90 cc (3.0
fl.oz) same as collected
amount
less than 90 cc (3.0 fl.oz) 90 cc (3.0 fl.oz)
7. Install the compressor, then evacuate, charge and
perform the oil return operation.
8. Check system operation.
When it is impossible to preform oil return operation,
the compressor oil should be checked in the
following order:
1. Discharge and recover refrigerant and remove the
compressor.
2. Drain the compressor oil and measure the extracted
oil with a measuring cylinder.
3. Check the oil for contamination.
4. If more than 90 cc (3.0 fl. oz.) of oil is extracted from
the compressor, supply the same amount of oil to the
compressor to be installed. If the amount of oil
extracted is less than 90 cc (3.0 fl. oz.), recheck the
compressor oil in the following order:
5. Supply 90 cc (3.0 fl. oz.) of oil to the compressor and
install it onto the vehicle.
6. Evacuate and recharge with the proper amount of
refrigerant.
7. Perform the oil return operation.
8. Remove the compressor and recheck the amount of
oil.
9. Adjust the compressor oil, if necessary.
(Collected Amount) (Charging Amount)
more than 90 cc (3.0
fl.oz) same as collected
amount
less than 90 cc (3.0 fl.oz) 90 cc (3.0 fl.oz)
Checking and Adjusting for
Compressor Replacement
The oil is not charged in compressor (service parts). So it
is necessary to charge the proper amount of oil to the new
compressor.