2006 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2006 Factory Service Manual EM-62Revision: November 2009
OIL SEAL
2006 QX56
2. Lock the drive plate using Tool A. CAUTION:
Do not damage the drive plate. Especially, avoid deforming
and damaging the signal plate teeth (circumfer

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INFINITI QX56 2006 Factory Service Manual CYLINDER HEADEM-63
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Revision: November 2009 2006 QX56
CYLINDER HEADPFP:11041
On-Vehicle ServiceEBS00RFD
CHECKING COMPRESSION PRESSURE
1. Warm up the engine thoroughly. Then st

CYLINDER HEADEM-63
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Revision: November 2009 2006 QX56
CYLINDER HEADPFP:11041
On-Vehicle ServiceEBS00RFD
CHECKING COMPRESSION PRESSURE
1. Warm up the engine thoroughly. Then stop the engine.
2. Release the fuel pressure. Refer to EC-80, "
FUEL PRESSURE RELEASE" .
CAUTION:
If CONSULT-II is not used to release fuel pressure leave the fuel pump fuse disconnected until
step 7.
3. Remove the spark plug from each cylinder. Refer to EM-29, "
Removal and Installation" .
4. Connect the engine tachometer (not required in use of CONSULT-II).
5. Install the compression tester with Tool into the spark plug hole.
6. With the accelerator pedal fully depressed, turn the ignition switch to “START” for cranking. When the gauge pointer stabi-
lizes, read the compression pressure and engine rpm. Perform
these steps to check each cylinder.
Unit: kPa (kg/cm2 , psi) /rpm
CAUTION:
Always use a fully charged battery to obtain specified engine speed.
If the engine speed is out of the specified range, check the battery liquid for proper gravity. Check the
engine speed again with normal battery gravity.
If the compression pressure is below the minimum value, check the valve clearances and parts associ-
ated with the combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head,
cylinder head gasket). After checking, measure the compression pressure again.
If some cylinders have low compression pressure, pour a small amount of engine oil into the spark plug
hole of the cylinder to re-check it for compression.
–If the added engine oil improves the compression, the piston rings may be worn out or damaged. Check
the piston rings and replace if necessary.
–If the compression pressure remains at a low level despite the addition of engine oil, the valves may be
malfunctioning. Check the valves for damage. Replace the valve or valve seat accordingly.
If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, the gaskets may be leaking, or a valve in adjacent cylinders
may be damaged. Inspect and repair as required.
7. Install the components in the reverse order of removal.
8. Start the engine and confirm that it runs smoothly.
9. Perform trouble diagnosis. If DTC appears, erase it. Refer to LAN-26, "
CAN COMMUNICATION" .
Tool number : EG15050500 (J-45402)
Standard
MinimumDeference limit
between cylinders
1,520 (15.5, 220) / 200 1,324 (13.5, 192) / 200 98 (1.0, 14) / 200
WBIA0605E

Page 1955 of 3383

INFINITI QX56 2006 Factory Service Manual EM-64Revision: November 2009
CYLINDER HEAD
2006 QX56
Removal and InstallationEBS00RFE
REMOVAL
1. Remove the engine assembly from the vehicle. Refer to EM-74, "Removal and Installation" .
2. Remove the

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INFINITI QX56 2006 Factory Service Manual CYLINDER HEADEM-65
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Revision: November 2009 2006 QX56
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Diameter
Cylinder head bolts are tightened by plastic zone tightening
meth

Page 1957 of 3383

INFINITI QX56 2006 Factory Service Manual EM-66Revision: November 2009
CYLINDER HEAD
2006 QX56
Disassembly and AssemblyEBS00RFF
* Refer to GI-46, "Recommended Chemical Products and Sealants" .
DISASSEMBLY
1. Remove the spark plug. Refer to EM

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INFINITI QX56 2006 Factory Service Manual CYLINDER HEADEM-67
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Revision: November 2009 2006 QX56
7. Remove the valve oil seal using Tool.
8. Replace the valve seat if necessary. Refer to EM-71, "
VALVE SEAT REPLACEMENT

Page 1959 of 3383

INFINITI QX56 2006 Factory Service Manual EM-68Revision: November 2009
CYLINDER HEAD
2006 QX56
8. Install the valve collet using Tool. CAUTION:
When working, take care not to damage valve lifter holes.
9. Install the valve lifters.
Install t

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INFINITI QX56 2006 Factory Service Manual CYLINDER HEADEM-69
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Revision: November 2009 2006 QX56
VALVE DIMENSIONS
Check the dimensions of each valve. Refer to EM-69, "VA LV E
DIMENSIONS" .
If the dimensions are out o

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