Camshaft (EXH) Valve Clearance Adjustment

WARNING: This page is about a different car, the 2013 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

Perform adjustment depending on selected head thickness of valve lifter (EXH).

Measure the valve clearance. Refer to "INSPECTION ".
Remove VVEL ladder assembly and camshaft (EXH). Refer to "DISASSEMBLY AND ASSEMBLY ".
CAUTION: Never loosen adjusting bolts and mounting bolts (black color) of VVEL ladder assembly.
Remove valve lifter (EXH) at the locations that are out of the standard.
Measure the center thickness of the removed valve lifters (EXH) with a micrometer (A).

Fig 1: Measuring Center Thickness Of Removed Valve Lifters (EXH) Using Micrometer
Courtesy of NISSAN NORTH AMERICA, INC.
Use the equation below to calculate valve lifter (EXH) thickness for replacement.
Valve lifter (EXH) thickness calculation: t = t1 + (C1 - C2)

t = Valve lifter (EXH) thickness to be replaced

t1 = Removed valve lifter (EXH) thickness

C1 = Measured valve clearance

C2 = Standard valve clearance:

Exhaust: 0.33 mm (0.013 in)
- Thickness of new valve lifter (EXH) can be identified by stamp marks on the reverse side (inside the cylinder).
  Stamp mark 788 indicates 7.88 mm (0.3102 in) in thickness.
  
  Fig 2: Identifying Valve Lifter (EXH) Thickness And Stamp Mark
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Available thickness of valve lifter (EXH): 27 sizes with range 7.88 to 8.40 mm (0.3102 to 0.3307 in) in steps of 0.02 mm (0.0008 in) (when manufactured at factory). Refer to "CAMSHAFT ".
Install selected valve lifter (EXH).
Install VVEL ladder assembly and camshaft (EXH). Refer to "DISASSEMBLY AND ASSEMBLY ".
Manually turn crankshaft pulley a few turns.
Check that the valve clearances for cold engine are within the specifications by referring to the specified values. Refer to "INSPECTION ".
Install all removed parts in the reverse order of removal.
Warm up the engine, and check for unusual noise and vibration.