Cylinder Block Distortion

WARNING: This page is about a different car, the 2005 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

Remove any oil, scale, gasket, sealant and carbon deposits from the cylinder block surface.
CAUTION: Do not allow any debris to enter the oil or coolant passages.
Measure block upper face for distortion in six directions as shown.
Standard: 0.03 mm (0.0012 in)

Limit: 0.1 mm (0.004 in)
If measurement exceeds the limit, replace cylinder block.

Fig 1: Measuring Cylinder Block Distortion
Courtesy of NISSAN MOTOR CO., U.S.A.