Isuzu N-Series. Manual — part 70
1D2-4 COMPRESSOR OVERHAUL FOR TAIWAN
Checking and Adjusting for Compressor Replace-
ment
180 cc (5.0 lmp fl oz) of oil is charged in compressor
(service parts). So it is necessary to drain the proper
amount of oil from the new compressor.
1. Perform oil return operation.
2. Discharge refrigerant and remove the compressor.
3. Drain the compressor oil and measure the extract-
ed oil.
4. Check the compressor oil for contamination.
5. Adjust oil level as required.
6. Evacuate, charge and perform oil return operation.
7. Check system operation.
Contamination of compressor oil
Unlike engine oil, no cleaning agent is added to the com-
pressor oil. Even if the compressor runs for a long period
of time (approximately 1 season), the oil never becomes
contaminated as long as there is nothing wrong with the
compressor or its method of use.
Inspect the extracted oil for any of the following
conditions:
• The capacity of the oil has increased.
• The oil has changed color to red.
• Foreign substances, metal powder, etc., are
present in the oil.
If any of these conditions exists, compressor oil is
contaminated. Whenever contaminated compressor
oil is discovered, the receiver/drier must be re-
placed.
Oil return operation
There is close affinity between the oil and the refriger-
ant. During normal operation, part of the oil recirculates
with the refrigerant in the system.
When checking the amount of oil in the system, or re-
placing any component of the system, the compressor
must be run in advance for oil return operation. The pro-
cedure is as follows:
1. Open the all doors and engine hood.
2. Start the engine and A/C switch is “ON”. Set the fan
control knob at its highest position.
3. Run the compressor for more than 20 minutes be-
tween 800 and 1,000 rpm in order to operate the
system.
4. Stop the engine.
Replacement of component parts
When replacing system component parts, supply the fol-
lowing amount of oil to the component parts to be in-
stalled.
Amount of oil drained
from used compressor
Draining amount of oil
from new compressor
less than 180 cc
(3.4 Imp fl oz)
Same as drained amount
more than 180 cc
(3.4 Imp fl oz)
180 cc (3.4 lmp fl oz)
Component parts to be installed
Amount of oil
Evaporator
50 cc (1.4 lmp fl oz)
Condenser
30 cc (0.8 Imp fl oz)
Receiver/drier
30 cc (0.8 Imp fl oz)
Refrigerant line (One piece)
10 cc (0.3 Imp fl oz)
N1A0099E
COMPRESSOR OVERHAUL FOR TAIWAN 1D2-5
SERVICE PROCEDURES
Compressor Overhaul
Legend
1. Drive plate bolt
14. Front cylinder head
2. Drive plate
15. O-ring
3. Shim(s)
16. Gasket
4. Snap ring
17. Front valve plate
5. Cover (If so equipped)
18. Front suction valve
6. Pulley assembly
19. Rear cylinder head
7. Lead wire connector
20. O-ring
8. Field coil
21. Gasket
9. Felt (If so equipped)
22. Rear valve plate
10. Shaft seal cover (If so equipped)
23. Rear suction valve
11. Snap ring
24. Cylinder and shaft assembly
12. Shaft seal assembly
25. Key
13. Through bolt with gasket
26. Oil drain plug
N1A0100E
1D2-6 COMPRESSOR OVERHAUL FOR TAIWAN
Disassembly
1. Drive Plate Bolt
Using drive plate holder to prevent the drive plate
from rotating, then remove the bolt.
Drive Plate Holder: 5-8840-0117-0 (J-33939)
2. Drive Plate
Using drive plate puller and forcing screw to re-
move the drive plate.
Drive Plate Puller: 5-8840-0122-0 (J-33944-A)
Forcing Screw: 5-8840-0621-0 (J-33944-4)
If the frictional surface shows signs of damage due
to excessive heat, the drive plate and pulley should
be replaced.
3. Shim(s)
4. Snap Ring
5. Cover (If so equipped)
Using snap ring pliers to remove the snap ring.
6. Pulley Assembly
Using pulley puller pilot and pulley puller to remove
the pulley assembly.
Pulley Puller Pilot: 5-8840-0121-0 (J-33943)
Pulley Puller: 5-8840-0111-0 (J-8433)
Check the appearance of the pulley assembly. If
the frictional surface of the pulley shows signs of
excessive grooving due to slippage, both the pulley
and drive plate should be replaced. The frictional
surfaces of the pulley assembly should be cleaned
with a suitable solvent before reinstallation.
7. Lead Wire Connector
Remove the lead wire from lead wire fixing bush.
N1A0101E
N1A0102E
Legend
1. Cover
N1A0103E
N1A0104E
COMPRESSOR OVERHAUL FOR TAIWAN 1D2-7
8. Field Coil
Loosen three screws and remove the field coil with
lead wire.
Check coil for loose connector or cracked insula-
tion.
9. Felt (If so equipped)
10. Shaft Seal Cover (If so equipped)
Using shaft seal remover to remove the shaft seal
cover (1).
Engage the remover hook with the shaft seal cover
groove and slowly draw the shaft seal cover out.
Shaft Seal Remover: 5-8840-0120-0 (J-33942)
11. Snap Ring
Using snap ring pliers to remove the snap ring.
N1A0105E
N1A0106E
N1A0107E
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