Cylinder Head Distortion

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.

NOTE: When performing this inspection, cylinder block distortion should be also checked. Refer to "INSPECTION ".

Using a scraper, wipe out oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.
CAUTION: Never allow gasket fragments to enter engine oil or engine coolant passages.
At each of several locations on bottom surface of cylinder head, measure the distortion in six directions (A, B, C, D, E, F).
Limit: Refer to "CYLINDER HEAD ".

Fig 1: Measuring Cylinder Head Distortion Using Tool
Courtesy of NISSAN NORTH AMERICA, INC.
- If it exceeds the limit, replace VVEL ladder assembly & cylinder head assembly.
  NOTE: Cylinder head assembly cannot be replaced as a single part, because it is machined together with VVEL ladder assembly.