73. Crankshaft and Bearing Installation

Crankshaft and Bearing Installation

Special Tools

J-45059 - Angle Meter

For equivalent regional tools, refer to Special Tools (Special Tools).





Note: Ensure that the crankshaft bearing cap bolt holes and the crankshaft bearing cap mating surfaces are clean and dry.

1. Dip the crankshaft bearing cap bolts in clean engine oil.

Caution: Upper and lower inserts may be different. Do not obstruct any oil passages.

2. Place the crankshaft bearing inserts into the crankshaft bearing cap and into the engine block.

Note: The crankshaft bearing inserts will project slightly when put into place. Ensure that the bearing inserts project an equal distance on both sides. Ensure that the insert tangs are engaged.

3. Lubricate the crankshaft main bearing surface with clean engine oil.
4. Install the crankshaft.

Caution: In order to prevent the possibility of cylinder block or crankshaft bearing cap damage, the crankshaft bearing caps are tapped into the cylinder block cavity using a brass, lead, or a leather mallet before the attaching bolts are installed. Do not use attaching bolts to pull the crankshaft bearing caps into the seats. Failure to use this process may damage a cylinder block or a bearing cap.

5. Install the crankshaft main bearing caps. Apply a small amount of sealer GM P/N 1052942 (Canadian P/N 10953466) to the rear of the #4 crankshaft main bearing cap sealing surface.

Caution: Refer to Fastener Caution (Fastener Caution).

6. Install the crankshaft main bearing cap bolts. Use the J-45059 - meter in order to tighten the crankshaft main bearing cap bolts to 50 Nm (37 lb ft) plus 77 degrees.




7. Measure the crankshaft end play.

1. Thrust the crankshaft forward or rearward.
2. Insert a feeler gauge between the number 3 crankshaft bearing and the bearing surface of the crankshaft and measure the bearing clearance. The proper crankshaft end play clearance is 0.06-0.21 mm (0.002-0.008 in).
3. If the bearing clearance is not within specifications, inspect the thrust surfaces for nicks, gouges or raised metal. Minor imperfections may be removed with a fine stone.




8. Install the crankshaft position sensor into the side of the engine block.
9. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or the equivalent to the crankshaft position sensor stud threads.
10. Install the crankshaft position sensor stud and tighten to 11 Nm (98 lb in).
11. Install the crankshaft position sensor shield and nut and tighten to 11 Nm (98 lb in).