Valve Adjusting: Notes

WARNING: This page is about a different car, the 2008 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.

Fig 1: Checking Center Thickness Of Removed Lifter With Micrometer
Courtesy of NISSAN MOTOR CO., U.S.A.
Use the equation below to calculate valve lifter thickness for replacement.
Valve lifter thickness calculation: t = t1 + (C1 - C2)

t = Valve lifter thickness to be replaced

t1 = Removed valve lifter thickness

C1 = Measured valve clearance

C2 = Standard valve clearance:

Intake : 0.30 mm (0.012 in)*

Exhaust : 0.33 mm (0.013 in)*

*: Approximately 20°C (68°F)
- Thickness of new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder).
  
  Fig 2: Checking Thickness Of Valve Lifters
  Courtesy of NISSAN MOTOR CO., U.S.A.