Valve Guide Clearance

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.

Valve Stem Diameter

Measure the diameter of valve stem with micrometer (A).
Standard: Refer to "CYLINDER HEAD ".

Fig 1: Measuring Diameter Of Valve Stem Using Micrometer
Courtesy of NISSAN NORTH AMERICA, INC.

Valve Guide Inner Diameter
Measure the inner diameter of valve guide with bore gauge.
Standard: Refer to "CYLINDER HEAD ".

Valve Guide Clearance
(Valve guide clearance) = (Valve guide inner diameter) - (Valve stem diameter)
Standard: Refer to "CYLINDER HEAD ".
If the calculated value exceeds the limit.
- Replace valve (EXH) and/or valve guide (EXH). Refer to "EXPLODED VIEW ". (Exhaust side)
- Replace VVEL ladder assembly & cylinder head assembly. Refer to "EXPLODED VIEW ". (Intake side)
  NOTE: Since the valve (INT) and valve guide (INT) cannot be replaced by the piece, VVEL ladder assembly & cylinder head assembly replacement are required.