Infiniti QX56 (Z62). Manual - part 922

ENGINE MAINTENANCE

MA-15

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12. Check cooling system for leakage with engine running.

13. Warm up the engine, and check for sound of engine coolant flow while running engine from idle up to

3,000 rpm with heater temperature controller set at several position between “COOL” and “WARM”.
• Sound may be noticeable at heater unit.

14. Repeat step 13 three times.
15. If sound is heard, bleed air from cooling system by repeating step 4, and steps from 6 to 14 until engine

coolant level no longer drops. 

ENGINE COOLANT : Flushing

INFOID:0000000006394847

1.

Install reservoir tank if removed, and radiator drain plug.

CAUTION:

Be sure to clean drain plug and install with new O-ring. Refer to 

CO-13, "Exploded View"

.

If water drain plug on cylinder block is removed, close and tighten it. Refer to 

EM-107, "Disassem-

bly and Assembly"

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2.

Remove air relief plug (1) on heater hose.

3.

Fill radiator and reservoir tank with water until water spills from the air relief holes, then close air relief
plugs with clamp. Fill radiator and reservoir tank with water and reinstall caps.

4.

Run the engine and warm it up to normal operating temperature.

5.

Rev the engine two or three times under no-load.

6.

Stop the engine and wait until it cools down.

7.

Drain water from the system. Refer to 

MA-13, "ENGINE COOLANT : Draining"

.

8.

Repeat steps 1 through 7 until clear water begins to drain from radiator.

RESERVOIR TANK CAP

RESERVOIR TANK CAP : Inspection

INFOID:0000000006394848

• Check valve seat of reservoir tank cap. 
- Check if valve seat (A) is swollen to the extent that the edge of the

metal plunger (B) cannot be seen when watching it vertically from
the top.

- Check if valve seat has no soil and damage.

: 1.96 N·m (0.2 kg-m, 17 in-lb)

2.

Engine cover

: Vehicle front

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MA-16

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ENGINE MAINTENANCE

• Pull negative-pressure valve to open it, and check that it close

completely when released.

- Check that there is no dirt or damage on the valve seat of reservoir

tank cap negative-pressure valve. 

- Check that there are no unusualness in the opening and closing

conditions of negative-pressure valve.

• Check reservoir tank cap relief pressure.
- When connecting reservoir tank cap to the radiator cap tester

(commercial service tool) and the radiator cap tester adapter (com-
mercial service tool) (A), apply engine coolant to the cap seal sur-
face. 

• Replace reservoir tank cap if there is an unusualness related to the above three.

CAUTION:

When installing reservoir tank cap, thoroughly wipe out the water inlet filler neck to remove any waxy
residue or foreign material.

RADIATOR

RADIATOR : Inspection

INFOID:0000000006394849

Check radiator for mud or clogging. If necessary, clean radiator as per the following:
• Be careful not to bend or damage radiator fins.
• When radiator is cleaned without removal, remove all surrounding parts such as radiator cooling fan shroud.

Then tape harness and connectors to prevent water from entering.

1.

Apply water by hose to the back side of the radiator core vertically downward.

2.

Apply water again to all radiator core surfaces once per minute.

3.

Stop washing if any stains no longer flow out from radiator.

4.

Blow air into the back side of radiator core vertically downward.
• Use compressed air lower than 490 kPa (4.9 bar, 5 kg/cm

2

, 71 psi) and keep distance more than 30 cm

(11.8 in). 

5.

Blow air again into all the radiator core surfaces once per minute until no water sprays out.

FUEL LINES

SMA967B

Standard and limit

: Refer to 

CO-23, "Radiator"

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ENGINE MAINTENANCE

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FUEL LINES : Inspection

INFOID:0000000006394850

• Inspect fuel lines, fuel filler cap and fuel tank for improper attach-

ment, leakage, cracks, damage, loose connections, chafing or
deterioration.

• If necessary, repair or replace damaged parts.

AIR CLEANER FILTER

AIR CLEANER FILTER : Removal and Installation

INFOID:0000000006394838

REMOVAL

NOTE:
• The viscous paper type filter does not need cleaning between replacement intervals.
• Replace the air filter as necessary for periodic maintenance. Refer to 

MA-6, "Introduction of Periodic Mainte-

nance"

.

1.

Unhook clips, and lift air cleaner case (upper).

2.

Remove air cleaner filter from air cleaner case.

INSTALLATION

Install is the reverse order of removal.

ENGINE OIL

ENGINE OIL : Draining

INFOID:0000000006394841

WARNING:

• Be careful not to burn yourself, as the engine and engine oil may be hot.
• Prolonged and repeated contact with used engine oil may cause skin cancer; try to avoid direct skin

contact with used oil. If skin contact is made, wash thoroughly with soap or hand cleaner as soon as
possible.

1.

Warm up the engine, and check for any oil leaks.

2.

Stop the engine and wait for at least 10 minutes.

3.

Remove drain plug and oil filler cap to drain the old oil.

ENGINE OIL : Refilling

INFOID:0000000006394842

1.

Install drain plug with new washer.

CAUTION:

Be sure to clean drain plug and install with new washer.

2.

Refill with new engine oil.
Engine oil specification and viscosity: 
Refer to 

MA-10, "Fluids and Lubricants"

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CAUTION:

• The refill capacity depends on the engine oil temperature and drain time. Use these specifica-

tions for reference only.

• Always use oil level gauge to determine the proper amount of engine oil in engine.

A

: Engine

B

: Fuel line

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: Fuel tank

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Tightening torque

: Refer to 

EM-54, "Exploded View"

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Engine oil capacity

: Refer to 

LU-17, "Periodical Maintenance Specification"

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ENGINE MAINTENANCE

3.

Warm up the engine and check area around drain plug and oil filter for engine oil leakage.

4.

Stop the engine and wait for 10 minutes.

5.

Check the engine oil level. Refer to 

LU-7, "Inspection"

.

OIL FILTER

OIL FILTER : Removal and Installation

INFOID:0000000006394843

REMOVAL

1.

Remove front under cover.

2.

Drain engine oil. Refer to 

MA-17, "ENGINE OIL : Draining"

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3.

Remove oil filter using oil filter wrench [SST: KV10115801 (J-
38956)].

WARNING:

Be careful not to burn yourself, as the engine and engine oil
may be hot.

CAUTION:

• The oil filter is equipped with a pressure relief valve.
• Use Genuine NISSAN oil filter or equivalent.
• When removing, prepare a shop cloth to absorb any

engine oil leaks or spills.

• Do not allow engine oil to adhere to the drive belts.
• Completely wipe off any engine oil that adheres to the

engine and the vehicle.

INSTALLATION

1.

Remove foreign materials adhering to the oil filter seal mating surface.

2.

Apply clean engine oil to the oil filter seal circumference of the
new oil filter as shown.

3.

Screw on the oil filter manually until it touches the installation
surface, then tighten it by 2/3 turn as shown. Or tighten to speci-
fication.

4.

Refill engine with new engine oil. Refer to 

MA-17, "ENGINE OIL : Refilling"

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5.

Inspect engine for oil leaks. Refer to 

LU-7, "Inspection"

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6.

Install front under cover.

SPARK PLUG

WBIA0388E

SMA010

Oil filter

: 17.7 N·m (1.8 kg-m, 13 ft-lb)

SMA229B