Nissan Pathfinder (2008 year). Manual - part 357

CAMSHAFT VALVE CLEARANCE

EM-19

< ON-VEHICLE MAINTENANCE >

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• Measure the valve clearances at locations marked “

×

” as

shown in the table below (locations indicated in the illustration)
with feeler gauge.

• No. 1 cylinder at compression TDC

c.

Rotate crankshaft by 240

°

 clockwise (when viewed from engine

front) to align No. 3 cylinder at TDC of its compression stroke.
NOTE:
Crankshaft pulley bolt flange has a stamped line every 60

°

. They

can be used as a guide to rotation angle.

• Measure the valve clearances at locations marked “

×

” as

shown in the table below (locations indicated in the illustration)
with feeler gauge.

• No. 3 cylinder at compression TDC

Measuring position (RH bank)

No. 1 CYL.

No. 3 CYL.

No. 5 CYL.

No. 1 cylinder at 

compression TDC

EXH

×

INT

×

Measuring position (LH bank)

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 1 cylinder at 

compression TDC

INT

×

 

EXH

×

 

PBIC2054E

PBIC2916E

Measuring position (RH bank)

No. 1 CYL.

No. 3 CYL.

No. 5 CYL.

No. 3 cylinder at 

compression TDC

EXH

×

INT

×

Measuring position (LH bank)

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 3 cylinder at 

compression TDC

INT

×

 

EXH

 

×

PBIC2055E

EM-20

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CAMSHAFT VALVE CLEARANCE

d.

Rotate crankshaft by 240

°

 clockwise (when viewed from engine

front) to align No. 5 cylinder at TDC of compression stroke. 

• Measure the valve clearances at locations marked “

×

” as

shown in the table below (locations indicated in the illustration)
with feeler gauge.

• No. 5 cylinder at compression TDC

4.

For the measured value out of the standard, perform adjustment. 

ADJUSTMENT

• Perform adjustment depending on selected head thickness of valve lifter.
1.

Measure the valve clearance. 

2.

Remove camshaft. Refer to 

EM-81, "Removal and Installation"

.

3.

Remove valve lifters at the locations that are out of the standard.

4.

Measure the center thickness of removed valve lifters with
micrometer.

5.

Use the equation below to calculate valve lifter thickness for replacement.

PBIC2916E

Measuring position (RH bank)

No. 1 CYL.

No. 3 CYL.

No. 5 CYL.

No. 5 cylinder at 

compression TDC

EXH

×

INT

×

Measuring position (LH bank)

No. 2 CYL.

No. 4 CYL.

No. 6 CYL.

No. 5 cylinder at 

compression TDC

INT

×

 

EXH

 

×

PBIC2056E

KBIA0057E

CAMSHAFT VALVE CLEARANCE

EM-21

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• Thickness of new valve lifter can be identified by stamp marks

on the reverse side (inside the cylinder).

Intake

Available thickness of valve lifter: 27 sizes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory). Refer to 

EM-132, "Standard and Limit"

.

Exhaust

Available thickness of valve lifter: 25 sizes with range 7.88 to 8.36 mm (0.3102 to 0.3291 in) in steps of
0.02 mm (0.0008 in) (when manufactured at factory). Refer to 

EM-132, "Standard and Limit"

.

CAUTION:

Install identification letter at the end and top, “U” and “N”, at each of proper positions. (Be care-
ful of mis-installation between intake and exhaust.)

6.

Install selected valve lifter.

7.

Install camshaft. Refer to 

EM-81, "Removal and Installation"

.

8.

Manually turn crankshaft pulley a few turns. 

9.

Make sure that the valve clearances for cold engine are within the specifications by referring to the speci-
fied values.

10. Installation of the remaining components is in the reverse order of removal.

11. Start the engine, and check for unusual noise and vibration.

Valve lifter thickness calculation:

t = t

1

+ (C

1

– C

2

)

t

= Valve lifter thickness to be replaced

t

1

= Removed valve lifter thickness

C

1

= Measured valve clearance

C

2

= Standard valve clearance:

Intake

: 0.26 - 0.34 mm (0.010 - 0.013 in)*

Exhaust

: 0.29 - 0.37 mm (0.011 - 0.015 in)*

*: Approximately 20

°

C (68

°

F)

KBIA0119E

Stamp mark

Thickness

788U

7.88 mm (0.3102 in)

790U

7.90 mm (0.3110 in)

·

·

·

·

840U

8.40 mm (0.3307 in)

Stamp mark

Thickness

N788

7.88 mm (0.3102 in)

N790

7.90 mm (0.3110 in)

·

·

·

·

N836

8.36 mm (0.3291 in)

EM-22

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COMPRESSION PRESSURE

COMPRESSION PRESSURE

Compression Pressure

INFOID:0000000001301160

CHECKING COMPRESSION PRESSURE

1.

Warm up engine thoroughly. 

2.

Release fuel pressure. Refer to 

EC-481, "Fuel Pressure Check"

.

3.

Disconnect fuel pump fuse to avoid fuel injection during mea-
surement.

4.

Remove intake manifold collector. Refer to 

EM-26, "Removal and Installation"

.

5.

Remove spark plug from each cylinder. Refer to 

EM-16, "Changing Spark Plugs"

.

6.

Connect engine tachometer (not required in use of CONSULT-lIl).

7.

Install compression tester with adapter onto spark plug hole.

• Use compression gauge whose pick up end inserted to spark

plug hole is smaller than 20 mm (0.79 in) in diameter. Other-
wise, it may be caught by cylinder head during removal.

8.

Turn ignition switch to “START” for cranking. When the gauge pointer stabilizes, read the compression
pressure and engine rpm. Perform these steps to check each cylinder.

Compression pressure:

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 specified range, check battery liquid for proper gravity. Check engine speed

again with normal battery gravity. 

BBIA0534E

PBIC0900E

SBIA0533E

Standard

Minimum

Differential limit between cylinders

 1,275 (13.0, 185) / 300

981 (10.0, 142) / 300

98 (1.0, 14) / 300

COMPRESSION PRESSURE

EM-23

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• 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 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 the

piston 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 gaskets are leaking. In such a case, replace cyl-
inder head gaskets.

9.

After inspection is completed, install removed parts.

10. Start engine, and make sure that engine runs smoothly.

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

EC-85, "Description"

.

EM-24

< ON-VEHICLE REPAIR >

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ENGINE ROOM COVER

ON-VEHICLE REPAIR

ENGINE ROOM COVER

Removal and Installation

INFOID:0000000001281970

REMOVAL

1.

Remove bolts using power tool.

2.

Lift up on engine cover firmly to dislodge snap fit mounts.

CAUTION:

Do not damage or scratch cover when installing or remov-
ing. 

INSTALLATION

Installation is in the reverse order of removal.

WBIA0622E

AIR CLEANER AND AIR DUCT

EM-25

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AIR CLEANER AND AIR DUCT

Removal and Installation

INFOID:0000000001281975

REMOVAL

1.

Remove the engine room cover using power tool. Refer to 

EM-164, "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 (upper).

4.

Remove air cleaner filter and air cleaner case (lower).

• Add marks as necessary for easier installation.

CAUTION:

Handle mass air flow sensor with care.
• Do not shock it.
• Do not disassemble it.
• Do not touch its sensor.

INSPECTION AFTER REMOVAL

Inspect air duct for crack or tear.
• If anything found, replace air duct.

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

⇐

Front

AWBIA0133GB

EM-26

< ON-VEHICLE REPAIR >

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INTAKE MANIFOLD COLLECTOR

INTAKE MANIFOLD COLLECTOR

Removal and Installation

INFOID:0000000001281977

REMOVAL

WARNING:

To avoid the danger of being scalded, never drain engine coolant when engine is hot.

1.

Remove engine cover. Refer to 

EM-24, "Removal and Installation"

.

2.

Remove air cleaner case (upper) with mass air flow sensor and air duct assembly. Refer to 

EM-25,

"Removal and Installation"

.

3.

Remove electric throttle control actuator as follows:

a.

Drain engine coolant, or when water hoses are disconnected, attach plug to prevent engine coolant leak-
age. Refer to 

CO-12, "Changing Engine Coolant"

.

CAUTION:

• Perform when engine is cold.
• Do not spill engine coolant on drive belt.

b.

Disconnect water hoses from electric throttle control actuator.
• When engine coolant is not drained from radiator, attach plug to water hoses to prevent engine coolant

leakage.

c.

Disconnect harness connector.

1.

Vacuum tank

2.

VIAS control solenoid valve

3.

Vacuum hose

4.

Intake manifold collector support

5.

Water hose

6.

Electric throttle control actuator

7.

Water hose

8.

EVAP hose

9.

Bracket

10. EVAP hose

11.

EVAP canister purge volume control 
solenoid valve

12. Gasket

13. Gasket

14. Intake manifold collector

15. Clip

16. PCV hose

17. Connector

18. PCV hose

a.

To intake manifold collector

b.

To power valve

c.

To throttle body

d.

To cylinder head (RH bank)

WBIA0731E