Cylinder Block Distortion

WARNING: This page is about a different car, the 2013 Nissan Xterra. 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 engine oil or engine coolant passages.

Measure the distortion on the cylinder block upper face at some different points in six directions with straightedge and feeler gauge.
Limit: 0.1 mm (0.004 in)

Fig 1: Measuring Cylinder Block Distortion Using Straightedge And Feeler Gauge
Courtesy of NISSAN NORTH AMERICA, INC.
If it exceeds the limit, replace cylinder block.