GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 36660-A Torque Angle Meter


    Object Number: 637753  Size: SH
  1. Install the upper crankshaft main bearings into the block.

  2. Object Number: 637751  Size: SH
  3. Lubricate the upper crankshaft main bearing surface with clean engine oil.
  4. Install the crankshaft.

  5. Object Number: 637755  Size: SH

    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.

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

  9. Object Number: 637745  Size: SH

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

  10. Install the crankshaft main bearing cap stiffener.

  11. Object Number: 637743  Size: SH
  12. 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.

  13. Object Number: 637679  Size: SH

    Notice: 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.

  14. Tighten the crankshaft main bearing cap bolts in equal increments.
  15. Tighten

    1. Tighten the crankshaft main bearing cap bolts to 25 N·m (18 lb ft) in sequence.
    2. Use J 36660-A to tighten the crankshaft main bearing cap bolts an additional 180 degrees.