Crankshaft and Bearings Installation

Tools Required  : J 36660-A  Torque Angle Meter

1. Install the upper crankshaft main bearings into the block.
Fig 1: Installing Upper Crankshaft Main Bearings Into Block
Courtesy of GENERAL MOTORS CORP.
2. Lubricate the upper crankshaft main bearing surface with clean engine oil.
3. Install the crankshaft.
   Fig 2: Installing Crankshaft

   Courtesy of GENERAL MOTORS CORP.
   IMPORTANT: Refer to the pin stamp on the crankshaft main bearing caps for sequence and direction of installation.
4. Install the lower crankshaft main bearings into the main bearing caps.
5. Lubricate the lower crankshaft main bearing surface with clean engine oil.
6. Install the crankshaft main bearing caps.
   Fig 3: Installing Crankshaft Main Bearing Caps

   Courtesy of GENERAL MOTORS CORP.
   IMPORTANT: The crankshaft main bearing cap stiffener is directional. The end marked front goes to the front.
7. Install the crankshaft main bearing cap stiffener.
Fig 4: Installing Crankshaft Main Bearing Cap Stiffener
Courtesy of GENERAL MOTORS CORP.
8. 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 5: Installing New Crankshaft Main Bearing Bolts
Courtesy of GENERAL MOTORS CORP.
9. Tighten the crankshaft main bearing cap bolts in equal increments.
   NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

   Tighten 

   1. 9.1. Tighten the crankshaft main bearing cap bolts to 25 N.m (18 lb ft) in sequence.
   Fig 6: Tightening Crankshaft Main Bearing Cap Bolts In Sequence
   Courtesy of GENERAL MOTORS CORP.
   2. 9.2. Use J 36660-A to tighten the crankshaft main bearing cap bolts an additional 180 degrees.