Method by Calculation

Install main bearings (3) to cylinder block (1) and main bearing cap (2), and tighten main bearing cap bolts to the specified torque. Refer to "DISASSEMBLY AND ASSEMBLY " for the tightening procedure.
Measure the inner diameter of main bearing with a bore gauge.
(Oil clearance) = (Main bearing inner diameter) - (Crankshaft main journal diameter)

Standard and limit: Refer to " MAIN BEARING ".

If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain the specified bearing oil clearance. Refer to "DESCRIPTION ".

Fig 1: Measuring Main Bearing Inner Diameter Using Bore Gauge

Courtesy of NISSAN NORTH AMERICA, INC.