C 2500 Truck 2WD V8-305 5.0L VIN M SFI (1997)
Crankshaft Main Bearing: Description and Operation
The crankshaft bearings are of the precision insert type and do not use shims for adjustment. If the clearances are excessive, the new upper and the lower
bearings will be required. The service bearings are available in the standard size and an undersize.
The selective fitting of the crankshaft bearings are necessary in production in order to obtain close tolerances. For this reason, in one journal bore you
may use one-half of a standard crankshaft bearing with one-half of a undersize crankshaft bearing.
In order to determine the correct replacement bearing size, the bearing clearance must be measured accurately. Either the micrometer or plastic gauge
method may be used, however, the micrometer method gives more reliable results and is preferred.
