GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Silverado - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Crankshaft Rear Oil Seal and Housing Installation

Special Tools

J 35621-B Rear Main Seal Installer

For equivalent regional tools, refer to Special Tools.

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 334326 Size: SH
  1. Install the crankshaft rear oil seal housing retainer stud and tighten to 6 N·m (53 lb in).

    2. Object Number: 334319 Size: SH

    Note: 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.

    3. Object Number: 1700100 Size: SH
  3. Install the crankshaft rear oil housing onto the crankshaft rear oil seal housing retainer stud.
  4. Install the crankshaft rear oil seal housing nut and bolts and tighten to 12 N·m (106 lb in).

    5. Object Number: 1700105 Size: SH

    Note: Notice the direction of the rear oil seal. The new design seal is a reverse style as opposed to what has been used in the past. "THIS SIDE OUT" has been stamped into the seal as shown in the graphic.

  5. Inspect the J 35621-B installer flange for imperfections that may damage the crankshaft rear oil seal. Minor imperfections may be removed with a fine grade emery cloth.
  6. Clean the crankshaft sealing surface with a clean, lint free towel. Inspect the lead-in edge of the crankshaft for burrs or sharp edges that could damage the rear main oil seal. Remove the burrs or sharp edges with a fine grade emery cloth before proceeding.

    7. Note: Do not apply or use any oil lubrication on the crankshaft rear oil seal or seal installer. Do not touch the sealing lip of the oil seal once the protective sleeve is removed.

  7. Carefully remove the protection sleeve from the NEW crankshaft rear oil seal.

    8. Object Number: 1700109 Size: SH
  8. Install the crankshaft rear oil seal onto the J 35621-B installer .
  9. Install the J 35621-B installer onto the rear of the crankshaft and hand tighten the tool bolts until snug.

    10. Caution: Refer to Fastener Caution in the Preface section.

  10. Install the crankshaft rear oil seal onto the crankshaft and into the crankshaft rear oil seal housing.
    11. 10.1. Turn the J 35621-B installer 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.
    10.2. Turn the J 35621-B installer wing nut counterclockwise to release the J 35621-B installer from the crankshaft rear oil seal.
  11. Remove the J 35621-B installer from the crankshaft.
  12. Wipe off any excess engine oil with a clean rag.