Method A

WARNING: This page is about a different variant/trim than selected.

Fig 1: View of Measuring Crankshaft Bearing Journal Using Method A

Courtesy of GENERAL MOTORS COMPANY

NOTE:

Do not mix inserts of different nominal size in the same bearing bore.

To measure bearing clearance using Method A, use the following procedure:

Measure the crankshaft bearing journal diameter with a micrometer (1) in several places, 90 degrees apart. Average the measurements.
Measure the crankshaft bearing journal taper and runout.
Install the lower crankcase and tighten the bearing cap bolts to specification.
Measure bearing inside diameter (ID) in several places 90 degrees apart, average measurements.
Subtract journal measurement from bearing ID measurement to determine clearance.
Determine whether clearance is within specification.
If out of specification, choose different inserts.
Measure the connecting rod inside diameter in the same direction as the length of the rod with an inside micrometer.
Measure the crankshaft main bearing inside diameter with an inside micrometer.