Nissan Pathfinder. Manual - part 545

CAMSHAFT VALVE CLEARANCE

EM-19

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6. Check only the valves as shown.

a. Using suitable tool, measure the clearance between the valve

lifter and camshaft.

b. Record any valve clearance measurements which are out of

specification. They will be used later to determine the required

replacement lifter size.

7. Turn crankshaft 240

°.

8. Set No.3 cylinder at TDC on its compression stroke.

Crank Position

Valve No. 1

Valve No. 2

Valve No. 3

Valve No. 6

No. 1 TDC

Intake

Exhaust

Exhaust

Intake

SEM893E

Valve clearance : Refer to 

EM-133, 

"General Specification"

.

SEM139D

KBIA0185E

EM-20

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CAMSHAFT VALVE CLEARANCE

9. Check only those valves as shown.

10. Turn the crankshaft 240

° and align as above.

11. Set No.5 cylinder at TDC on its compression stroke.
12. Check only those valves as shown.

13. Perform adjustment if the measured values are out of the specification range. 
14. Installation of components is in the reverse order of removal.

VALVE ADJUSTING

CAUTION:

Adjust valve clearance while engine is cold.

NOTE:

• Perform adjustment by selecting the correct head thickness of the valve lifter (adjusting shims are not used).

Crank Position

Valve No. 2

Valve No. 3

Valve No. 4

Valve No. 5

No. 3 TDC

Intake

Intake

Exhaust

Exhaust

SEM894E

Crank Position

Valve No. 1

Valve No. 4

Valve No. 5

Valve No. 6

No. 5 TDC

Exhaust

Intake

Intake

Exhaust

SEM958E

CAMSHAFT VALVE CLEARANCE

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• The specified valve lifter thickness dimension is measured at room temperature. 

• Use specifications for hot engine for hot engine condition to confirm valve clearances.
1. Remove the camshaft.
2. Remove the valve lifter that was measured as being outside the standard specifications.
3. Measure the center thickness of the removed valve lifter using

suitable tool as shown.

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

a. The thickness of the new valve lifter can be identified by the

stamp mark (A) on the reverse side (inside the valve lifter).

NOTE:

Available thicknesses of the valve lifters (B) are: 7.88 - 8.40 mm

(0.3102 - 0.3307 in), in 0.02 mm (0.0008 in) increments. Refer to

EM-134, "Camshaft"

5. Install the selected replacement valve lifter.
6. Install the camshaft.
7. Rotate the crankshaft a few turns by hand.
8. Confirm that the valve clearances are within specification.
9. After the engine has been run to full operating temperature, confirm that the valve clearances are within

specification.

1

 : Approximately 20

°C (68°F)

2

 : Approximately 80

°C (176°F)

SEM754G

Valve lifter thickness calculation:

(C

1 

– C

2

) + t1=t

C

1

 = measured valve clearance

C

2

 = standard valve clearance

t

1

 = thickness of the removed valve lifter

t = thickness of the replacement valve lifter

JPBIA0170ZZ

Standard Valve Clearance

Cold

1

 (reference data)

Hot

2

 (reference data)

Intake

0.26 - 0.34 mm (0.010 - 0.013 in)

0.304 - 0.416 mm (0.012 - 0.016 in)

Exhaust

0.29 - 0.37 mm (0.011 - 0.015 in)

0.308 - 0.432 mm (0.012 - 0.017 in)

EM-22

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COMPRESSION PRESSURE

COMPRESSION PRESSURE

On-Vehicle Service

INFOID:0000000009177895

CHECKING COMPRESSION PRESSURE

1. Run the engine until it reaches normal operating temperature.
2. Turn the ignition switch to OFF.
3. Release fuel pressure and leave the fuel pump electrically disconnected.

Refer to 

EC-151, "Work Procedure"

. 

4. Remove all six spark plugs.

Refer to 

EM-16, "Removal and Installation"

.

5. Attach a compression tester to No. 1 cylinder.

6. Depress accelerator pedal fully to keep the electric throttle control actuator butterfly-valve wide open to

maximize air intake flow.

7. Crank the engine and record the highest gauge indication.

CAUTION:

Always use a fully charged battery to obtain specified engine speed.

8. Repeat the test for each cylinder (steps 5 - 7). 

Unit: kPa (kg/cm

2

, psi) /rpm

• If the engine speed is out of the specified range, check the battery and recharge as necessary. Check

the engine speed again with the battery properly charged. 

• 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, 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, 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, cylinder head gaskets may be leaking, or a valve in adjacent

cylinders may be damaged. Inspect and repair as required.

• 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 the checking, measure the compression pressure again.

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

SBIA0533E

Standard

Minimum

Differential limit between cylinders

 1,275 (13.0, 185) / 300

981 (10.0, 142) / 300

98 (1.0, 14) / 300