Crankshaft and Bearings Installation

CRANKSHAFT BEARING INSTALLATION





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. Be sure 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.





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 GM crankshaft prelube, GM P/N 1052367, or engine oil, to the upper and lower bearing surfaces.

CRANKSHAFT INSTALLATION





1. Install the crankshaft sprocket drive key (1). If necessary, lightly tap the key in place with a small hammer until it bottoms on the crankshaft.





2. Gently lower the crankshaft into position in the cylinder block.
3. Make sure the crankshaft turns without binding or noise.