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Fig 1: View of EN-8087 Gage To Measure Bearing Bore

Courtesy of GENERAL MOTORS CORP.

NOTE: If crankshaft bearing failure is due to other than normal wear, investigate the cause. Inspect the crankshaft or connecting rod bearing bores.

Inspect the connecting rod bearing bores or crankshaft main bearing bores using the following procedure:

Tighten the bedplate to specification using the EN 45059: meter.
Measure the bearing bore for taper and out-of-round using the EN-8087: gauge (1).
No taper or out-of-round should exist.