Valve Adjusting
WARNING: This page is about a different car, the 2018 Nissan Maxima. 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 dimension is measured at room temperature.
- Use specifications for hot engine for hot engine condition to confirm valve clearances.
- Remove the camshaft.
- Remove the valve lifter that was measured as being outside the standard specifications.
- Measure the center thickness of the removed lifter with suitable tool (A) as shown, below.
- Use the equation below to calculate the replacement valve lifter thickness.
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 lifter
t = thickness of the replacement lifter
- The thickness of the new valve lifter can be identified by the stamp mark (A) on the reverse side (inside the lifter).NOTE: Available thicknesses of the valve lifters (B) are: 3.00 - 3.50 mm (0.1181 - 0.1378 in), in 0.02 mm (0.0008 in) increments. Refer to Camshaft .
- The thickness of the new valve lifter can be identified by the stamp mark (A) on the reverse side (inside the lifter).
- Install the selected replacement valve lifter.
- Install the camshaft.
- 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.
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)
1 : Approximately 20°C (68°F)
2 : Approximately 80°C (176°F)