Installation Procedure

Important: 

• Do not reuse the crankshaft oil seal or rear cover gasket.
• Do not apply any type of sealant to the rear cover gasket (unless specified).
• The special tool in this procedure is used to properly center the crankshaft rear oil seal.
• The crankshaft rear oil seal will be installed after the rear cover has been installed and aligned.

  Install the rear cover without the crankshaft oil seal.

  • All gasket surfaces should be free of oil or other foreign material during assembly.
  • The crankshaft rear oil seal MUST be centered in relation to the crankshaft.
  • An improperly aligned rear cover may cause premature rear oil seal wear and/or engine assembly oil leaks.

1. Apply a 5 mm (0.20 in) bead of sealant GM U.S. P/N 12378190, or equivalent 20 mm (0.80 in) long to the oil pan to engine block junction.
   Fig 1: Applying Sealant To Oil Pan To Engine Block Junction

   Courtesy of GENERAL MOTORS CORP.
2. Install the rear cover gasket and cover.
3. Install the rear cover bolts until snug. Do not overtighten.
   Fig 2: Installing Rear Cover Gasket, Cover & Bolts

   Courtesy of GENERAL MOTORS CORP.
4. Install the oil pan-to-rear cover bolts (1) until snug. Do not overtighten.
   Fig 3: Installing Oil Pan-To-Rear Cover Bolts

   Courtesy of GENERAL MOTORS CORP.
5. Rotate the crankshaft until two opposing flywheel bolt holes are parallel to the oil pan surface.

   Important:  The tapered legs of the alignment tool must enter the rear cover oil seal bore.

6. Install the J 41476  and bolts onto the rear of the crankshaft.
   CAUTION: 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.
7. Tighten the J 41476  mounting bolts until snug. Do not overtighten.

   Tighten 

   1. Tighten the oil pan-to-rear cover bolts to 12 N.m (106 lb in).
   2. Tighten the engine rear cover bolts to 25 N.m (18 lb ft).
   Fig 4: Installing J 41476 & Bolts

   Courtesy of GENERAL MOTORS CORP.
8. Remove the J 41476  .
9. Install a NEW crankshaft rear oil seal. Refer to Crankshaft Rear Oil Seal Replacement .
10. Install the engine flywheel. Refer to Engine Flywheel Replacement .