2005 INFINITI QX4 Factory Service Manual

relay wheel bolt torque adding oil start stop button wiring diagram boot

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INFINITI QX4 2005 Factory Service Manual EM-58Revision: October 2005
CYLINDER HEAD
2005 QX56
CYLINDER HEADPFP:11041
On-Vehicle ServiceEBS00LME
CHECKING COMPRESSION PRESSURE
1. Warm up the engine thoroughly. Then stop the engine.
2. Release t

EM-58Revision: October 2005
CYLINDER HEAD
2005 QX56
CYLINDER HEADPFP:11041
On-Vehicle ServiceEBS00LME
CHECKING COMPRESSION PRESSURE
1. Warm up the engine thoroughly. Then stop the engine.
2. Release the fuel pressure. Refer to EC-93, "
FUEL PRESSURE RELEASE" .
CAUTION:
Leave the fuel pump fuse disconnected until step 7.
3. Remove the spark plug from each cylinder. Refer to EM-27, "
REMOVAL" .
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 EC-95, "
TROUBLE DIAGNOSIS" . 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 1962 of 3419

INFINITI QX4 2005 Factory Service Manual CYLINDER HEAD
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Removal and InstallationEBS00LMF
REMOVAL
1. Remove the engine assembly from the vehicle. Refer to EM-69, "REMOVAL" .
2. Re

Page 1963 of 3419

INFINITI QX4 2005 Factory Service Manual EM-60Revision: October 2005
CYLINDER HEAD
2005 QX56
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Diameter
Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size diffe

Page 1964 of 3419

INFINITI QX4 2005 Factory Service Manual CYLINDER HEAD
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Disassembly and AssemblyEBS00LMG
* Refer to GI-45, "Recommended Chemical Products and Sealants" .
DISASSEMBLY
1. Remove th

Page 1965 of 3419

INFINITI QX4 2005 Factory Service Manual EM-62Revision: October 2005
CYLINDER HEAD
2005 QX56
7. Remove the valve oil seal using Tool.
8. Replace the valve seat if necessary. Refer to EM-67, "
VALVE SEAT REPLACEMENT" .
9. Replace the valve gu

Page 1966 of 3419

INFINITI QX4 2005 Factory Service Manual CYLINDER HEAD
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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

Page 1967 of 3419

INFINITI QX4 2005 Factory Service Manual EM-64Revision: October 2005
CYLINDER HEAD
2005 QX56
VALVE DIMENSIONS
Check the dimensions of each valve. Refer to EM-64, "VA LV E
DIMENSIONS" .
If the dimensions are out of the standard, replace the

Page 1968 of 3419

INFINITI QX4 2005 Factory Service Manual CYLINDER HEAD
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VALVE GUIDE CLEARANCE
Valve Stem Diameter
Measure the diameter of the valve stem using suitable tool.
Valve Guide Inside D

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