Nissan Frontier D40. Manual - part 573

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COMPRESSION PRESSURE

• If compression pressure is below minimum value, check valve clearances and parts associated with

combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure the compression pressure again.

• If some cylinders have low compression pressure, pour 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, piston rings may be worn out or damaged. Check pis-

ton rings and replace if necessary.

• If the compression pressure remains at low level despite the addition of engine oil, valves may be mal-

functioning. Check valves for damage. Replace 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, cylinder head gasket is leaking. In such a case, replace cylinder
head gasket.

8.

After inspection is completed, install removed parts.

9.

Start engine, and make sure that engine runs smoothly. 

10. Perform trouble diagnosis. If DTC appears, erase it. Refer to 

EC-79, "Inspection Procedure"

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AIR CLEANER AND AIR DUCT

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ON-VEHICLE REPAIR

AIR CLEANER AND AIR DUCT

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Removal and Installation

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NOTE:
Add mating marks as necessary for easier installation.

REMOVAL

1.

Remove the breather hose from the air duct.

2.

Disconnect MAF sensor.

3.

Loosen the air duct clamps and remove the air duct.

4.

Remove the air duct and resonator assembly bolts and remove air duct and resonator assembly.
• Remove resonator in fender lifting left fender protector, as necessary.

5.

Remove air cleaner case.

6.

Remove MAF sensor, if necessary.

INSPECTION AFTER REMOVAL

Inspect air duct and air duct and resonator assembly for cracks or tears.
• Replace air duct and air duct and resonator assembly, if necessary.

INSTALLATION

Installation is in the reverse order of removal.

1.

Air cleaner case

2.

Air duct and resonator assembly

3.

Air duct

4.

Intake manifold

5.

Air cleaner filter

LBIA0441E

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AIR CLEANER AND AIR DUCT

• Align marks. Attach each joint. Tighten clamps firmly.
• Install air duct and resonator assembly to air cleaner case by aligning "LOCK-UNLOCK" upward.

INTAKE MANIFOLD

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Removal and Installation

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CAUTION:

Do not remove or disassemble parts unless instructed as shown.

REMOVAL

1.

Release fuel pressure. Refer to 

EC-454, "Fuel Pressure Check"

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2.

Disconnect battery negative terminal. Refer to 

PG-84, "Removal and Installation"

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3.

Partially drain engine coolant. Refer to 

CO-12, "Changing Engine Coolant"

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1.

Vacuum hose

2.

Vacuum hose adapter

3.

O–ring

4.

Vacuum hose

5.

EVAP canister purge volume control 
solenoid valve

6.

Vacuum hose

7.

Service port

8.

Collar

9.

Grommet

10. Intake manifold support

11. Vacuum hose

12. Gasket

13. Intake manifold

14. Fuel tube protector

15. Air cleaner filter

16. Air cleaner case

17. PCV hose

18. Gasket

19. PCV hose

20. Water hose

21. Water hose

22. Air duct

23. Electric throttle control actuator

24. Mass air flow sensor

A.

To vacuum pipe (EVAP canister)

B.

To brake booster

C.

To PCV valve

D.  To heater outlet

E.

To heater pipe

F.

To rocker cover

Engine front

WBIA0733E