Crankshaft, Bearings and Bearing Cap Installation

TOOLS REQUIRED
J 36660 Torque Angle Meter or equivalent.





PROCEDURE
1. 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 attach the bolts to pull the crankshaft bearing caps into the seats. Failure to observe this information may damage a cylinder block or a bearing cap.





2. Install the main bearing caps. Use GM approved sealer at the Number 4 main bearing cap to the block surface.

CAUTION: This bolt is designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do not use a bolt that is stronger in this application. If the correct bolt is not used, the parts will not be tightened correctly. The system or the components may be damaged.

3. Install the main bearing cap bolts. Start the main bolts by hand. Ensure that the bottom of the cap is parallel to the bottom of the channel.
^ Tighten all of the caps in equal increments. Do not tighten one cap completely at a time.
^ Tighten the bolts to 70 Nm (52 ft. lbs.) in order to fully seat the caps. Loosen the bolts 360 degrees counterclockwise.
^ Tighten the bolts to 20 Nm (15 ft. lbs.), then 40 Nm (30 ft. lbs.).
^ Use the J 36660 in order to tighten the bolts in steps: 35 degrees + 35 degrees + 40 degrees for a total of 110 degrees.
4. Install the side main bolts.
^ Tighten the side main bolts to 15 Nm (11 ft. lbs.). Use the J 36660 in order to tighten the bolts an additional 45 degrees.
5. Install the connecting rod bearing inserts.
6. Install the connecting rod cap bolts.
^ Tighten the connecting rod cap bolts to 27 Nm (20 ft. lbs.). Use the J 36660 in order to tighten the bolts an additional 50 degrees.