Nissan Altima 2007-2012 Service Manual: Camshaft valve clearance

Valve Clearance

CHECKING

• Perform inspection as follows after removal, installation or replacement of camshaft or valve related parts, or if there is unusual engine conditions regarding valve clearance.

Check valve clearance while engine is cold and not running.

1. Remove the air duct with air cleaner case, collectors, hoses, wires, harnesses, and connectors.

2. Remove the intake manifold collectors.

3. Remove the ignition coils and spark plugs.

4. Remove the rocker covers.

5. Set No.1 cylinder at TDC on its compression stroke.

• Align pointer with TDC mark on crankshaft pulley.

• Check that the valve lifters on No.1 cylinder are loose and valve lifters on No.4 are tight. If not, turn the crankshaft one full revolution (360°) and align as shown.

6. Check only the valves as shown.

• Using a feeler gauge, measure the clearance between the valve lifter and camshaft.

• Record any valve clearance measurements which are out of specification. They will be used later to determine the required replacement lifter size.

Valve Clearance for Checking (cold)

Intake : 0.26 - 0.34 mm (0.010 - 0.013 in)

Exhaust : 0.29 - 0.37 mm (0.011 - 0.015 in)

7. Turn crankshaft 240°.

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

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. If all valve clearances are within specification, install the following components. If the valve clearances are out of specification, adjust the valve clearances.

• Intake manifold collectors

• Rocker covers

• All spark plugs

• All ignition coils

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).

• The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differences caused by temperature. Use specifications 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 lifter with a micrometer, as shown.

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

Valve lifter thickness calculation equation: t = t1 + (C1 - C2) t = thickness of the replacement lifter

t1 = thickness of the removed lifter

C1 = measured valve clearance

C2 = standard valve clearance

• The thickness of the new valve lifter can be identified by the stamp mark on the reverse side (inside the lifter).

• Available thickness of the valve lifter (factory setting): 7.88 - 8.40 mm (0.3102 - 0.3307 in), in 0.02 mm (0.0008 in) increments, in 27 sizes (intake / exhaust). Refer to EM-231, "Cylinder Head".

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.

* Approximately 80°C (176°F)

    Air cleaner filter
    Removal and Installation 1. Air duct hose 2. Duct sub-cover 3. Front air duct 4. Air cleaner case (lower) 5. Grommets 6. Air cleaner case mounting bracket 7. Bracket 8. Air cleaner filter 9 ...

    Compression pressure
    On-Vehicle Service 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 fue ...

    Other materials:

    Front power window switch
    Reference Value TERMINAL LAYOUT PHYSICAL VALUES POWER WINDOW AND DOOR LOCK/UNLOCK SWITCH RH Wiring Diagram Fail Safe FAIL-SAFE CONTROL Switches to fail-safe control when malfunction is detected in encoder signal that detects up/down speed and direction of door glass. Swi ...

    U1215 DVD-ROM load
    Description Refer to AV-240, "System Description". DTC Logic DTC DETECTION LOGIC Diagnosis Procedure 1.CHECK DVD-ROM Check DVD-ROM for dirt, scratches and warpage. Is the DVD-ROM clean and undamaged? YES >> Replace AV control unit. Refer to AV-437, "Removal and Ins ...

    Basic inspection
    DIAGNOSIS AND REPAIR WORKFLOW Trouble Diagnosis Flow Chart Trouble Diagnosis Procedure INTERVIEW WITH CUSTOMER Interview with the customer is important to detect the root cause of CAN communication system errors and to understand vehicle condition and symptoms for proper trouble diagnosis. ...