Crankshaft And Bearings Installation: Installation

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Fig 1: View Of Upper Crankshaft Main Bearing Halves

Courtesy of GENERAL MOTORS CORP.

Install the upper crankshaft main bearings into the block.

Fig 2: View Of Crankshaft

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

Fig 3: View Of Crankshaft Main Bearing Caps & Lower Bearings

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IMPORTANT: Refer to the pin stamp on the crankshaft main bearing caps for sequence and direction of installation. The pin stamp arrow points to the front of the engine.

Install the lower crankshaft main bearings into the main bearing caps.
Lubricate the lower crankshaft main bearing surface with clean engine oil.
Install the crankshaft main bearing caps.

Fig 4: View Of Crankshaft Main Bearing Cap Stiffener

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IMPORTANT: The crankshaft main bearing cap stiffener is directional. The end marked front goes to the front.

Install the crankshaft main bearing cap stiffener.

Fig 5: View Of Crankshaft Main Bearing Cap Bolts

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Install new crankshaft main bearing bolts. Start the crankshaft main bearing cap bolts by hand. Ensure the bottom of the crankshaft main bearing cap is parallel to the block surface.

Fig 6: Crankshaft Main Bearing Cap Bolt Tightening Sequence

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NOTE: Refer to Fastener Notice in Cautions and Notices.

Tighten the crankshaft main bearing cap bolts in equal increments.
Tighten:
1. Tighten the crankshaft main bearing cap bolts to 25 N.m (18 lb ft) in sequence.
2. Use J 45059 to tighten the crankshaft main bearing cap bolts an additional 180 degrees. See Special Tools and Equipment .

Fig 7: Measuring Crankshaft End Play

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Measure the crankshaft end play.
1. Thrust the crankshaft forward or rearward.
2. Insert a feeler gage between the thrust crankshaft bearing and the bearing surface of the crankshaft and measure the bearing clearance. Refer to Engine Mechanical Specifications for the proper clearance.
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.