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Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 12829
Experience:  ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
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silverado..rear main seal leak cause this truck to not idle

Resolved Question:

how to change a rear seal on a 2001 silverado? will a rear main seal leak cause this truck to not idle properly of a morning.
Submitted: 7 years ago.
Category: Chevy
Expert:  Randall C replied 7 years ago.
Hello, do you have 4x4 or 2 WD?
Customer: replied 7 years ago.
2wd extended cab
Expert:  Randall C replied 7 years ago.

Thanks. No a rear seal will not cause running problems and generally only an oil leak. Cold start or cold running problems could one of several things.You could easily have one or 2 injectors not seating all the way and slowly dripping overnight and will cause rough run, possible hard start, miss and /or hesistion when cold. A fuel pressure reading is required to check this. As far as rear seal, the trans has to come out then the flywheel off then the seal. A special tool should be used but.. you can tap in with hammer if very careful.


Crankshaft Rear Oil Seal Replacement

  • Tools Required
  • J 41479 Crankshaft Rear Oil Seal Installer

Removal Procedure

  1. Remove the engine flywheel.
  2. Remove the crankshaft rear oil seal (1) from the rear cover.

Installation Procedure


  • The flywheel spacer (if applicable) must be removed prior to oil seal installation.
  • Do not lubricate the oil seal Inside Diameter (ID) or the crankshaft surface.
  • Do not reuse the crankshaft rear oil seal.

  1. Lubricate the Outside Diameter (OD) of the oil seal (1) with clean engine oil. DO NOT allow oil or other lubricants to contact the seal surface.
  2. Lubricate the rear cover oil seal bore with clean engine oil. DO NOT allow oil or other lubricants to contact the crankshaft surface.

  1. Install the J 41479 tapered cone (2) and bolts onto the rear of the crankshaft.
  2. Tighten the bolts until snug. Do not overtighten.
  3. Install the rear oil seal onto the tapered cone (2) and push the seal to the rear cover bore.
  4. Thread the J 41479 threaded rod into the tapered cone until the tool (1) contacts the oil seal.
  5. Align the oil seal into the tool (1).
  6. Rotate the handle of the tool (1) clockwise until the seal enters the rear cover and bottoms into the cover bore.
  7. Remove the J 41479.
  8. Install the engine flywheel.


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