Infiniti QX56 (Z62). Manual — part 772
NOISE
HA-29
< SYMPTOM DIAGNOSIS >
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NOISE
Symptom Table
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Symptom
Noise source
Probable cause
Corrective action
Unusual noise from compressor
when A/C is ON.
Inside of compressor
Wear, breakage, or clogging of foreign
material in inner parts.
Check compressor oil. Re-
fer to
.
Magnet clutch
Contact of clutch disc with pulley.
Check clearance between
clutch disc and pulley. Refer
to
Compressor body
Loosened compressor mounting bolts.
Check bolts for tightness.
Refer to
Unusual noise from cooler piping.
Cooler piping (pipe and
flexible hose)
Improper installation of clip and brack-
et.
Check the installation condi-
tion of the cooler piping. Re-
fer to
Unusual noise from expansion
valve when A/C is ON.
Expansion valve
Shortage of refrigerant.
• Check for leakage.
• Collect all refrigerant,
evacuate refrigerant cycle
again, and then refill it
with the specified amount
of refrigerant.
Wear, breakage, or clogging of foreign
material in inner parts.
Eliminate foreign material
from expansion valve, or re-
place it.
Unusual noise from belt.
—
Loosened belt
Check belt tension. Refer to
.
Internal compressor parts get locked
Replace compressor.
HA-30
< REMOVAL AND INSTALLATION >
COMPRESSOR
REMOVAL AND INSTALLATION
COMPRESSOR
Exploded View
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REMOVAL
DISASSEMBLY
COMPRESSOR
COMPRESSOR : Removal and Installation
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CAUTION:
1.
High-pressure flexible hose
2.
O-ring
3.
Compressor
4.
Low-pressure flexible hose
A.
To condenser
B.
To evaporator
Refer to
for symbols in the figure.
JMIIA0622GB
1.
Clutch disc
2.
Shim
3.
Snap ring
4.
Pulley assembly
5.
Field coil
6.
Compressor unit
Refer to
for symbols in the figure.
JMIIA0805GB
COMPRESSOR
HA-31
< REMOVAL AND INSTALLATION >
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G
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A
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Perform lubricant return operation before each refrigeration system disassembly. However, if a large
amount of refrigerant or lubricant is detected, never perform lubricant return operation. Refer to
22, "Perform Lubricant Return Operation"
REMOVAL
1.
Use a refrigerant collecting equipment (for HFC-134a) to discharge the refrigerant. Refer to
2.
Remove air cleaner. Refer to
EM-27, "Removal and Installation"
3.
Remove mounting bolts, and then disconnect low-pressure flexible hose and high-pressure flexible hose
from the compressor.
CAUTION:
Cap or wrap the joint of the A/C piping and compressor with suitable material such as vinyl tape to
avoid the entry of air.
4.
Remove front under cover. Refer to
.
5.
Remove drive belt. Refer to
EM-20, "Removal and Installation"
.
6.
Remove mounting bolts (A), and harness clip, and then remove bracket (1).
7.
Remove cooling fan shroud (lower). Refer to
.
8.
Disconnect compressor (magnet clutch) connector.
9.
Remove mounting bolts, and then remove compressor form the vehicle.
INSTALLATION
Note the following items, and install in the reverse order of removal.
CAUTION:
• Tighten compressor mounting bolts in numerical order as
shown in the figure.
• Replace O-rings with new ones. Then apply compressor oil to them when installing.
• Perform lubricant adjusting procedure before installing new compressor. Refer to
Adjusting Procedure for Compressor Replacement"
• Check for leakages when recharging refrigerant. Refer to
• Check tension of the drive belt after installing compressor. Refer to
MAGNET CLUTCH
MAGNET CLUTCH : Removal and Installation of Compressor Clutch
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REMOVAL
1.
Fix clutch disc.
: Vehicle front
JMIIA0681ZZ
JMIIA0804ZZ
HA-32
< REMOVAL AND INSTALLATION >
COMPRESSOR
2.
Remove center bolt, and then remove clutch disc.
3.
Remove snap ring using external snap ring pliers.
4.
Position center pulley puller on the end of the drive shaft, and remove pulley assembly using any commer-
cially available pulley puller.
To prevent pulley groove from being deformed, puller claws should be positioned into the edge of the pul-
ley assembly.
5.
Disconnect field coil harness from compressor unit.
6.
Remove screws, and then remove field coil.
INSTALLATION
1.
Install field coil (1).
Be sure to align the coil’s pin (2) with the hole in the compres-
sor’s front head.
2.
Connect field coil harness to compressor unit.
3.
Install pulley assembly (1) using installer (SST: J-41260) (A) and
a hand press, and then install snap ring (2) using snap ring pli-
ers.
4.
Install clutch disc on drive shaft, together with original shim(s). Press clutch disc down by hand.
5.
Using holder to prevent clutch disc rotation.
After tightening the bolt, check that the pulley rotates smoothly.
Break-in Operation
When replacing compressor clutch assembly, always carry out the break-in operation. This is done by engag-
ing and disengaging the clutch about thirty-times. Break-in operation raises the level of transmitted torque.
Inspection
INFOID:0000000006276165
CHECK DISC TO PULLEY CLEARANCE
Check the clearance (B) between pulley assembly (1) and clutch
disc (2) along the entire periphery with a feeler gauge (A).
Replace compressor if specified clearance is not obtained.
JMIIA0575ZZ
JMIIA0576ZZ
Clearance
: Refer to
JPIIA1566ZZ
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