GM Service Manual Online
For 1990-2009 cars only

Crankshaft Rear Oil Seal and Housing Replacement Housing

Removal Procedure


    Object Number: 31739  Size: SH

    Important: Do not remove the crankshaft rear oil seal housing if only replacing the crankshaft rear oil seal.

  1. Remove the oil pan. Refer to Oil Pan Replacement .
  2. Remove the transmission assembly. Refer to Transmission Replacement in Automatic Transmission.
  3. Remove the flywheel. Refer to Engine Flywheel Replacement .

  4. Object Number: 334317  Size: SH
  5. Remove the three bolts and the one nut holding the crankshaft rear oil seal housing to the engine.
  6. Remove the crankshaft rear oil seal housing.

  7. Object Number: 334319  Size: SH
  8. Remove and discard the crankshaft rear oil seal housing gasket.
  9. Clean all sealing surfaces.
  10. Inspect the crankshaft rear oil seal housing for warping, cracks, wear, or damage.

Installation Procedure


    Object Number: 334319  Size: SH
  1. Install a NEW crankshaft rear oil seal housing gasket.

  2. Object Number: 334317  Size: SH

    Important: When installing the NEW crankshaft rear oil seal housing the seal will come with the housing. Use the following procedure for installing a new crankshaft rear oil seal housing. Refer to Crankshaft Rear Oil Seal and Housing Replacement if reusing the housing.

  3. Install the NEW crankshaft rear oil seal housing with the oil seal to the engine block using the following procedure:
  4.         Important: Do not oil or grease the seal lip or the crankshaft.

    2.1. Leave the sleeve in the crankshaft rear oil seal and use the sleeve as a guide to ease the seal lip over the end of the crankshaft
    2.2. Push the crankshaft rear oil seal housing with the seal, fully onto the crankshaft until the housing is contacting the gasket and the engine.

    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.

  5. Install the three bolts and the one nut to the crankshaft rear oil seal housing.
  6. Tighten
    Tighten the crankshaft rear oil seal housing bolts and nut to 12 N·m (106 lb in).

  7. Install the flywheel. Refer to Engine Flywheel Replacement .
  8. Install the transmission assembly. Refer to Transmission Replacement in Automatic Transmission.

  9. Object Number: 31739  Size: SH
  10. Install the oil pan. Refer to Oil Pan Replacement .

Crankshaft Rear Oil Seal and Housing Replacement Oil Seal

Removal Procedure


    Object Number: 31379  Size: SH
  1. Remove the transmission assembly. Refer to Transmission Replacement in Automatic Transmission.
  2. Remove the flywheel. Refer to Engine Flywheel Replacement .
  3. Remove the crankshaft rear oil seal from the crankshaft rear oil seal housing.
  4. Insert a suitable tool into the access notches and then carefully pry the crankshaft rear oil seal from the crankshaft rear oil seal housing.

  5. Discard the crankshaft rear oil seal.
  6. Clean off any dirt or rust in the area.

Installation Procedure

Tools Required

J 35621-B Rear Main Seal Installer


    Object Number: 334550  Size: SH

    Important: Do not oil or grease the crankshaft rear oil seal lip.

  1. Use the J 35621-B in order to install the NEW crankshaft rear oil seal. Refer to Crankshaft Rear Oil Seal and Housing Installation .
  2. Install the flywheel. Refer to Engine Flywheel Replacement .
  3. Install the transmission assembly. Refer to Transmission Replacement in Automatic Transmission.