Cylinder Block Distortion

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: Checking Distortion Of Cylinder Block Upper Face
Courtesy of NISSAN MOTOR CO., U.S.A.