Infiniti QX56 (JA60). Manual - part 467

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 specifications. Refer to 

EM-108, "Standard

and Limit"

.

9. After completing the repair, check the valve clearances again with the specifications for a warmed engine.

Make sure the values are within specifications. Refer to 

EM-108, "Standard and Limit"

.

COMPRESSION PRESSURE

EM-23

< ON-VEHICLE MAINTENANCE >

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COMPRESSION PRESSURE

Checking Compression Pressure

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1. Warm up the engine thoroughly. Then stop the engine.
2. Release the fuel pressure. Refer to 

EC-489, "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/cm

2

, 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-74, "Description"

.

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) / 200

WBIA0605E

EM-24

< ON-VEHICLE REPAIR >

ENGINE ROOM COVER

ON-VEHICLE REPAIR

ENGINE ROOM COVER

Removal and Installation

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CAUTION:

Do not damage or scratch engine room cover when installing or removing. 

REMOVAL

• Remove the engine room cover bolts and engine room cover.

INSTALLATION

Installation is in the reverse order of removal.

WBIA0795E

AIR CLEANER AND AIR DUCT

EM-25

< ON-VEHICLE REPAIR >

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AIR CLEANER AND AIR DUCT

Exploded View

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Removal and Installation

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REMOVAL

1. Remove the engine room cover using power tool. Refer to 

EM-24, "Removal and Installation"

.

2. Disconnect the harness connector from air cleaner case (upper).
3. Remove the air duct and resonator assembly and air cleaner case.
4. Remove air cleaner filter and air cleaner case (lower)
• Add marks as necessary for easier installation.

INSTALLATION

Installation is in the reverse order of removal.

1.

Air cleaner case (lower)

2.

Air cleaner filter

3.

Air cleaner case (upper)

4.

Air duct and resonator assembly

Front

ALBIA0413GB