GM Service Manual Online
For 1990-2009 cars only

    Object Number: 373781  Size: SH
  1. Install the upper bearing inserts and the thrust bearings into the cylinder block (1).
  2. Important: The upper bearing inserts have an engine oil groove (3). Install the inserts and the bearings with the engine oil groove to the cylinder block.


    Object Number: 373797  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.

    Important: Gradual tightening and uniform tightening is important for main bearing bolts. After tightening the main bearing cap bolts, inspect the bolts in order to check that the crankshaft rolls smoothly when turned by hand.

  3. Install the four main bearing caps with the lower inserts, and secure the four caps with the eight main bearing cap bolts.
  4. Each main bearing cap is embossed with an arrow mark and with a number. When installing each bearing cap to the cylinder block, point the arrow mark toward the crankshaft timing pulley side.

    Tighten
    Tighten the main bearing cap bolts to 54 N·m (40 lb ft).