2007 INFINITI QX56 Factory Service Manual

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Page 1833 of 3061

INFINITI QX56 2007 Factory Service Manual
OIL SEALEM-63
< SERVICE INFORMATION >
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3. Remove the drive plate.
CAUTION:
Place the drive plate with the si gnal plate surface facing upward.
4. Remove the engine rear

Page 1834 of 3061

INFINITI QX56 2007 Factory Service Manual
EM-64
< SERVICE INFORMATION >
CYLINDER HEAD
CYLINDER HEAD
On-Vehicle ServiceINFOID:0000000003531540
CHECKING COMPRESSION PRESSURE
1. Warm up the engine thoroughly. Then stop the engine.
2. Release th

EM-64
< SERVICE INFORMATION >
CYLINDER HEAD
CYLINDER HEAD
On-Vehicle ServiceINFOID:0000000003531540
CHECKING COMPRESSION PRESSURE
1. Warm up the engine thoroughly. Then stop the engine.
2. Release the fuel pressure. Refer to EC-80, "
Fuel Pressure Check".
CAUTION:
If CONSULT-II is not used to release fuel pressure leave the fu el 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, che ck 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, t he 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. R eplace the valve or valve seat accordingly.
• If two adjacent cylinders have respectively low co mpression 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 EC-32
.
Tool number : EG15050500 (J-45402)
Standard Minimum
Deference limit be-
tween cylinders
1,520 (15.5, 220) / 200 1,324 (13.5, 192) / 200 98 (1.0, 14) / 200WBIA0605E

Page 1835 of 3061

INFINITI QX56 2007 Factory Service Manual
CYLINDER HEADEM-65
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Removal and InstallationINFOID:0000000003531541
REMOVAL
1. Remove the engine assembly from the vehicle. Refer to
EM-74, "Rem

Page 1836 of 3061

INFINITI QX56 2007 Factory Service Manual
EM-66
< SERVICE INFORMATION >
CYLINDER HEAD
•Cylinder head bolts are tight ened by pla stic zone tight ening
method.
Whenever the size diff erence between d1 and d2 exceeds
t he limit, r ep

Page 1837 of 3061

INFINITI QX56 2007 Factory Service Manual CYLINDER HEAD
EM-67
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Disassembly and AssemblyINFOID:0000000003531542
DISASSEMBLY
1. Remove the spark plug. Refer to EM-29, "Removal and Installat

Page 1838 of 3061

INFINITI QX56 2007 Factory Service Manual EM-68
< SERVICE INFORMATION >
CYLINDER HEAD
7. Remove the valve oil seal using Tool.
8. Replace the valve seat if necessary. Refer to EM-69, "
Inspection After Disassembly".
9. Replace the valve guide

Page 1839 of 3061

INFINITI QX56 2007 Factory Service Manual CYLINDER HEAD
EM-69
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8. Install the valve collet using Tool.
CAUTION:
When working, take care not to damage valve lifter holes.
9. Install the v

Page 1840 of 3061

INFINITI QX56 2007 Factory Service Manual EM-70
< SERVICE INFORMATION >
CYLINDER HEAD
• Check the dimensions of each valve. Refer to EM-103, "Standard
and Limit".
• If the dimensions are out of the standard, replace the valve.
VALVE GUIDE

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