Crankshaft Bearing Installation Procedure

Important:  If the crankshaft bearings have been used in a running engine, you must replace them with NEW crankshaft bearings for reassembly.

1. Clean the upper and lower crankcase crank bore with a lint-free cloth.
2. Clean all the oil from the backside of new bearing halves.
3. Install new upper crankshaft bearings into position. The thrust bearing (1) belongs in the number three journal (2). Ensure that the upper bearing insert contains the oil transfer hole and groove. Roll the bearing into position so that the lock tang engages the crank slot. The bearing must fit flush with the upper crankcase.
   Fig 1: Installing New Upper Crankshaft Bearings

   Courtesy of GENERAL MOTORS CORP.

   Important:  The number three crankshaft lower bearing is wider than the other crankshaft lower bearings and must be installed in the proper position.

4. Install new lower crankshaft bearings into position in the lower crankcase. The lower crankcase crankshaft bearings are identified by NO grooves or holes. The bearings must fit flush with the lower crankcase.
5. Apply a liberal amount of crankshaft prelube GM P/N US 1052367, Canada 992869, or clean engine oil GM P/N US 12345501, Canada 992704, to the upper and lower bearing surfaces.
   Fig 2: Installing New Lower Crankshaft Bearings

   Courtesy of GENERAL MOTORS CORP.