48. Lower Crankcase Installation

Lower Crankcase Installation

Tools Required

J 45059 Angle Meter




1. Install the upper crankshaft bearings and lubricate bearing surfaces with engine oil.




2. Install the crankshaft on the journals.




3. Install the lower bearing halves, without grooves, into the lower crankcase. Apply oil to bearing surfaces.




4. Apply sealer GM P/N 12378521 (Canadian P/N 88901148) to the surfaces of the engine block to bedplate mating surfaces.




5. Install the lower crankcase. Tap gently into place with a suitable tool if necessary. Ensure it is aligned properly on the dowels.





Notice: Refer to Fastener Notice.

6. Install the NEW crankshaft bearing bolts in sequence finger tight.
1. Tighten the crankshaft bearing bolts in sequence.

Tighten the crankshaft bearing bolts to 20 N.m (15 lb ft).

2. Tighten the crankshaft bearing bolts in sequence using the J 45059.

Tighten the crankshaft bearing bolts 70 degrees using the torque angle meter.




7. Tighten the lower crankcase perimeter bolts in sequence.

Tighten the lower crankcase perimeter bolts to 25 N.m (18 lb ft).