Crankshaft Out-Of-Round And Taper

Measure the dimensions at four different points as shown in the figure below, on each main journal and pin journal with a micrometer.

Courtesy of NISSAN NORTH AMERICA, INC.
Out-of-round is indicated by the difference in the dimensions between (d) and (c) at (a) and (b).

Taper is indicated by the difference in the dimensions between.

Out-of-round (Difference between "c" and "d")		: Refer to Cylinder Block .
Taper (Difference between "a" and "b")

If the measured value exceeds the limit, correct or replace crankshaft.
If corrected, measure the bearing oil clearance of the corrected main journal and/or pin journal. Then select the main bearing and/or connecting rod bearing. Refer to Main Bearing and/or Connecting Rod Bearing .