Valve Adjusting

WARNING: This page is about a different variant/trim than selected.

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.
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 lifter
Courtesy of NISSAN MOTOR CO., U.S.A.
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 - 8.36 mm (0.3102 - 0.3291 in), in 0.02 mm (0.0008 in) increments, in 25 sizes (intake / exhaust).
  
  Value lifter thickness:
  1. Intake: 0.30 mm (0.012 in)
  2. Exhaust: 0.33 mm (0.013 in)
  Fig 2: Locating Stamped Mark
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Valve Lifter Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
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.

Fig 4: Valve Lash Specification Table
Courtesy of NISSAN MOTOR CO., U.S.A.