Cylinder Block Distortion

Using a scraper, remove gasket on the cylinder block surface, and also remove engine oil, scale, carbon, or other contamination.
CAUTION: Never allow gasket flakes to enter engine oil or engine coolant passages.
Measure the distortion on the cylinder block upper face at some different points in six directions (C), (D), (E), (F), (G), and (H) with a straightedge (A) and a feeler gauge (B).
Limit: Refer to "CYLINDER BLOCK ".
If it exceeds the limit, replace cylinder block.

Fig 1: Measuring Distortion On Cylinder Block Upper Face Using Straightedge And Feeler Gauge
Courtesy of NISSAN NORTH AMERICA, INC.