66. Crankshaft and Bearings Installation

Crankshaft and Bearings Installation

^ Tools Required
- J 36660-A Torque Angle Meter





1. Install the upper crankshaft main bearings.
2. Install the crankshaft. Lubricate the crankshaft to crankshaft main bearing contact areas with engine oil or engine assembly lubricant.

Notice: 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.

3. Install the lower crankshaft main bearings into the main bearing caps.





4. Install the crankshaft main bearing caps. Use GM P/N 1052942 sealer at the number 4 crankshaft main bearing cap to the engine block surface.

Notice:
^ Refer to Special Fastener Notice in Service Precautions.
^ Refer to Fastener Notice in Service Precautions.

5. Install the crankshaft main bearing cap bolts. Start the crankshaft main bearing cap bolts by hand. Ensure the bottom of the crankshaft main bearing cap is parallel to the bottom of the channel.
^ Tighten the crankshaft main bearing cap bolts in equal increments. Do not completely tighten one bolt at a time to prevent the cap from being cocked.
^ Tighten the bolts to 70 Nm (52 ft. lbs.) to fully seat the crankshaft main bearing caps. Loosen the bolts 360 degrees counterclockwise.
^ Tighten the bolts to 20 Nm (15 ft. lbs.), then 40 Nm (30 ft. lbs.).
^ Use J 36660-A to tighten the bolts in steps: 35 degrees + 35 degrees + 40 degrees for a total of 110 degrees.
6. Install the side main bolts. Apply GM P/N 12345493 or equivalent to the side main bolts.
Tighten the side crankshaft main bearing cap bolts to 15 Nm (11 ft. lbs.). Use J 36660-A to tighten the bolts an additional 45 degrees.