2009 INFINITI QX56 Factory Service Manual

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Page 1841 of 4171

INFINITI QX56 2009 Factory Service Manual EM-18
< ON-VEHICLE MAINTENANCE >
CAMSHAFT VALVE CLEARANCE
CAMSHAFT VALVE CLEARANCE
Valve ClearanceINFOID:0000000005885869
INSPECTION
NOTE:
Perform the following inspection after removal, installation

Page 1842 of 4171

INFINITI QX56 2009 Factory Service Manual CAMSHAFT VALVE CLEARANCEEM-19
< ON-VEHICLE MAINTENANCE >
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6. Measure valve clearances at the locations marked “×
” as shown
in the table below (locations indicated w

Page 1843 of 4171

INFINITI QX56 2009 Factory Service Manual EM-20
< ON-VEHICLE MAINTENANCE >
CAMSHAFT VALVE CLEARANCE
8. Measure valve clearances at the locations marked “×” as shown
in the table below (locations indicated with white arrow).
• : Engine

Page 1844 of 4171

INFINITI QX56 2009 Factory Service Manual CAMSHAFT VALVE CLEARANCEEM-21
< ON-VEHICLE MAINTENANCE >
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9. Turn the crankshaft pulley clockwise 90°
from the position of No.
3 cylinder compression TDC (clockwise by

Page 1845 of 4171

INFINITI QX56 2009 Factory Service Manual EM-22
< ON-VEHICLE MAINTENANCE >
CAMSHAFT VALVE CLEARANCE
6. Install the camshaft.
7. Manually turn the crankshaft pulley a few turns.
8. Make sure the valve clearances for a cold engine are within sp

Page 1846 of 4171

INFINITI QX56 2009 Factory Service Manual COMPRESSION PRESSUREEM-23
< ON-VEHICLE MAINTENANCE >
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COMPRESSION PRESSURE
Checking Compression PressureINFOID:0000000005885870
1. Warm up the engine thoroughly. Then sto

COMPRESSION PRESSUREEM-23
< ON-VEHICLE MAINTENANCE >
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COMPRESSION PRESSURE
Checking Compression PressureINFOID:0000000005885870
1. Warm up the engine thoroughly. Then stop the engine.
2. Release the fuel pressure. Refer to EC-487, "
Fuel Pressure Check".
CAUTION:
If CONSULT-III 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-16, "
Removal and Installation".
4. Connect the engine tachometer (not required in use of CONSULT-III).
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, 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. 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-8, "
Trouble Diagnosis Introduction".
Tool number : EG15050500 (J-45402)
Standard
MinimumDeference limit be-
tween cylinders
1,520 (15.5, 220) / 200 1,324 (13.5, 192) / 200 98 (1.0, 14) / 200WBIA0605E
Revision: December 20092009 QX56

Page 1847 of 4171

INFINITI QX56 2009 Factory Service Manual EM-24
< ON-VEHICLE REPAIR >
ENGINE ROOM COVER
ON-VEHICLE REPAIR
ENGINE ROOM COVER
Removal and InstallationINFOID:0000000005885871
CAUTION:
Do not damage or scratch engine room cover when installing or

Page 1848 of 4171

INFINITI QX56 2009 Factory Service Manual AIR CLEANER AND AIR DUCTEM-25
< ON-VEHICLE REPAIR >
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AIR CLEANER AND AIR DUCT
Exploded ViewINFOID:0000000005885872
Removal and InstallationINFOID:0000000005885873
REMOVAL

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