Nissan Titan. Manual - part 305

EM-24

< PERIODIC MAINTENANCE >

COMPRESSION PRESSURE

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 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-17, "Removal and Installation"

.

4. Connect the engine tachometer (not required in use of CONSULT).
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. Installation of the components is 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-30, "System 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

ENGINE ROOM COVER

EM-25

< REMOVAL AND INSTALLATION >

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REMOVAL AND INSTALLATION

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

EM-26

< REMOVAL AND INSTALLATION >

AIR CLEANER AND AIR DUCT

AIR CLEANER AND AIR DUCT

Exploded View

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Removal and Installation

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CAUTION:

Handle mass air flow sensor with care.

• Do not shock it.

• Do not disassemble it.

• Do not touch its sensor,

REMOVAL

NOTE:

Add marks as necessary for easier installation.
1. Remove the engine room cover, (if equipped). Refer to 

EM-25, "Removal and Installation"

.

2. Disconnect the harness connector from air cleaner case (upper).
3. Disconnect crankcase ventilation hoses at resonator.
4. Remove the air duct and resonator assembly and air cleaner case (upper).
5. Remove air cleaner filter and air cleaner case (lower).

INSPECTION AFTER REMOVAL

Inspect air duct, resonator assembly, and air cleaner case for cracks or tearing.

• Replace air duct and resonator assembly as necessary.

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

INTAKE MANIFOLD

EM-27

< REMOVAL AND INSTALLATION >

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INTAKE MANIFOLD

Exploded View

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Removal and Installation

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NOTE:

When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spill-

ing.

REMOVAL

1. Partially drain the engine coolant. Refer to 

CO-11, "Changing Engine Coolant"

.

WARNING:

To avoid the danger of being scalded, do not drain the engine coolant when the engine is hot.

2. Disconnect the negative battery terminal. Refer to 

PG-80, "Removal and Installation"

.

3. Release the fuel pressure. Refer to 

EC-489, "Fuel Pressure Check"

.

4. Remove the air duct and resonator assembly. Refer to 

EM-26, "Removal and Installation"

.

5. Disconnect crankcase ventilation hoses at the intake manifold.

1.

Intake manifold

2.

PCV hose

3.

Gasket

4.

Electric throttle control actuator

5.

Water hose

6.

Water hose

7.

PCV hose

8.

EVAP hose

9.

EVAP canister purge control solenoid valve

10.

Bracket

11.

Gasket

KBIA2461E