GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC MD Steel Tilt (W Model) 🢒 Engine 🢒 Engine Mechanical - 5.0L and 5.7L 🢒 Crankshaft Rear Oil Seal and Housing Installation

Tools Required

J 35621-B Rear Main Seal Installer


    Object Number: 11479 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.

  1. Install the crankshaft rear oil seal housing retainer stud.

    2. Tighten
    Tighten the crankshaft rear oil seal housing retainer stud to 6 N·m (53 lb in).

    Important: Always use a NEW crankshaft rear oil seal housing gasket when installing the crankshaft rear oil seal housing.

  2. Install the NEW crankshaft rear oil seal housing gasket and the crankshaft rear oil housing onto the crankshaft rear oil seal housing retainer stud.
  3. Install the crankshaft rear oil seal housing nut and bolts.

    4. Tighten
    Tighten the crankshaft rear oil seal housing nut and bolts to 12 N·m (106 lb in).


    Object Number: 334550 Size: SH
  4. Apply a small amount, approximately 2-3 drops, of clean engine GM P/N United States 12345610, GM P/N Canada 993193, or equivalent, oil to the bore of the crankshaft rear oil seal housing.
  5. Inspect the outside diameter of the engine flywheel pilot flange for imperfections or rust.

    6. Minor imperfections and/or rust may be removed with a fine grade emery cloth.

  6. Apply a small amount, approximately 2-3 drops, of clean engine GM P/N United States 12345610, GM P/N Canada 993193, or equivalent, oil to the outside diameter of the engine flywheel pilot flange.
  7. Apply a small amount, approximately 1 drop, of clean engine oil GM P/N United States 12345610, GM P/N Canada 993193, or equivalent, to the outside diameter of the flywheel locator pin.
  8. Apply a small amount of clean engine GM P/N United States 12345610, GM P/N Canada 993193, or equivalent, oil to the crankshaft seal surface.
  9. Inspect the J 35621-B flange for imperfections that may damage the crankshaft rear oil seal.

    10. Minor imperfections may be removed with a fine grade emery cloth.

    Important: DO NOT allow oil or any other lubricants to contact the seal lip surface of the crankshaft rear oil seal.

  10. Remove the installation guide from the NEW crankshaft rear oil seal.
  11. Apply a small amount, approximately 2-3 drops, of clean engine oil GM P/N United States 12345610, GM P/N Canada 993193, or equivalent, to the outside diameter of the NEW crankshaft rear oil seal.
  12. Install the NEW crankshaft rear oil seal onto the J 35621-B .
  13. Install the J 35621-B onto the rear of the crankshaft and hand tighten the tool bolts until snug.

    14. Notice: Proper alignment of the crankshaft rear oil seal is critical. Install the crankshaft rear oil seal near to flush and square to the crankshaft rear oil seal housing. Failing to do so may cause the crankshaft rear oil seal or the crankshaft rear oil seal installation tool to fail.

    Important: A properly installed crankshaft rear oil seal will be near to flush and square to the crankshaft rear oil seal housing.

  14. Install the crankshaft rear oil seal onto the crankshaft and into the crankshaft rear oil seal housing.
    15. 14.1. Turn the J 35621-B wing nut clockwise until the crankshaft rear oil seal is installed near to flush and square to the crankshaft rear oil seal housing.

    Increased resistance will be felt when the crankshaft rear oil seal has reached the bottom of the crankshaft rear oil seal housing bore.

    14.2. Turn the J 35621-B wing nut counter clockwise to release the J 35621-B from the crankshaft rear oil seal.
  15. Remove the J 35621-B from the crankshaft.
  16. Wipe off any excess engine oil with a clean rag.

Tools Required

J 35621-B Rear Main Seal Installer


    Object Number: 11479 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.

  1. Install the crankshaft rear oil seal housing retainer stud.

    2. Tighten
    Tighten the crankshaft rear oil seal housing retainer stud to 6 N·m (53 lb in).

    Important: Always use a NEW crankshaft rear oil seal housing gasket when installing the crankshaft rear oil seal housing.

  2. Install the NEW crankshaft rear oil seal housing gasket and the crankshaft rear oil housing onto the crankshaft rear oil seal housing retainer stud.
  3. Install the crankshaft rear oil seal housing nut and bolts.

    4. Tighten
    Tighten the crankshaft rear oil seal housing nut and bolts to 12 N·m (106 lb in).


    Object Number: 334550 Size: SH
  4. Apply a small amount (2 to 3 drops) of clean engine GM P/N 12345610 or equivalent oil to the bore of the crankshaft rear oil seal housing.
  5. Inspect the outside diameter of the engine flywheel pilot flange for imperfections or rust.

    6. Minor imperfections and/or rust may be removed with a fine grade emery cloth.

  6. Apply a small amount (2 to 3 drops) of clean engine GM P/N 12345610 or equivalent oil to the outside diameter of the engine flywheel pilot flange.
  7. Apply a small amount (1 drop) of clean engine oil GM P/N 12345610 or equivalent to the outside diameter of the flywheel locator pin.
  8. Apply a small amount of clean engine GM P/N 12345610 or equivalent oil to the crankshaft seal surface.
  9. Inspect the J 35621-B flange for imperfections that may damage the crankshaft rear oil seal.

    10. Minor imperfections may be removed with a fine grade emery cloth.

    Important: DO NOT allow oil or any other lubricants to contact the seal lip surface of the crankshaft rear oil seal.

  10. Remove the installation guide from the NEW crankshaft rear oil seal.
  11. Apply a small amount (2 to 3 drops) of clean engine oil GM P/N 12345610 or equivalent to the outside diameter of the NEW crankshaft rear oil seal.
  12. Install the NEW crankshaft rear oil seal onto the J 35621-B .
  13. Install the J 35621-B onto the rear of the crankshaft and hand tighten the tool bolts until snug.

    14. Notice: Proper alignment of the crankshaft rear oil seal is critical. Install the crankshaft rear oil seal near to flush and square to the crankshaft rear oil seal housing. Failing to do so may cause the crankshaft rear oil seal or the crankshaft rear oil seal installation tool to fail.

    Important: A properly installed crankshaft rear oil seal will be near to flush and square to the crankshaft rear oil seal housing.

  14. Install the crankshaft rear oil seal onto the crankshaft and into the crankshaft rear oil seal housing.
    15. 14.1. Turn the J 35621-B wing nut clockwise until the crankshaft rear oil seal is installed near to flush and square to the crankshaft rear oil seal housing.

    Increased resistance will be felt when the crankshaft rear oil seal has reached the bottom of the crankshaft rear oil seal housing bore.

    14.2. Turn the J 35621-B wing nut counter clockwise to release the J 35621-B from the crankshaft rear oil seal.
  15. Remove the J 35621-B from the crankshaft.
  16. Wipe off any excess engine oil with a clean rag.