Valve Adjusting
WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
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.
- Remove the camshaft. Refer to REMOVAL .
- Remove the valve lifter that was measured as being outside the standard specifications.
- Measure the center thickness of the removed lifter with a micrometer as shown.
- 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 "VALVE LIFTER ".
NOTE: Two types of stamp marks are used for parallel setting and for manufacturer identification.- Value lifter thickness
- Intake: 0.30 mm (0.012 in)
- Exhaust: 0.33 mm (0.013 in)
- Install the selected replacement valve lifter.
- Install the camshaft. Refer to INSTALLATION .
- Rotate the crankshaft a few turns by hand.
- Confirm that the valve clearances are within specification.
- After the engine has been run to full operating temperature, confirm that the valve clearances are within specification.OPERATING TEMPERATURE REFERENCE CHART
Valve Clearance Cold Hot(1) (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) (1) Approximately 80°C (176°F)