Crankshaft Seal Replacement - Front

Step by step repair guide on how to replace an automotive engine crankshaft front seal. This replacement is for external mounted seals only and applies to most vehicles.

Difficulty Scale: 4 of 10

Tools and Supplies Needed

  • Socket set
  • Dampener puller
  • Large pry bar
  • Shop towels
  • Carburetor cleaner
  • Replacement front seal
  • Hammer
  • Seal installation tool or large socket
  • Safety eyewear and gloves
  • Hydraulic jack
  • Jack stands
  • Silicone sealer (high grade)
Begin with the vehicle on level ground, engine "OFF" in park with the emergency brake on. If engine access requires to lift the car, do so safety using jack stands.

Step 1 - Release the serpentine belt tensioner, while removing the belt from the engine compartment.

Removing Serpentine Belt

Step 2 - Once the serpentine belt has been removed, remove the front vibration dampener retainer bolt and washer. In this illustration an air impact is being used, but this can be done be with a regular socket wrench by holding the crankshaft at the flywheel. (Note: The starter will need to be removed.) Visit - Starter replacement

Removing Vibration Dampener Bolt

Step 3 - After the bolt and washer have been removed, assemble a dampener puller with the appropriate mounting bolts. (Note: Puller mounting bolts must be obtained.)

Vibration Dampener Puller

Step 4 - Once puller mounting bolts have been supplied, install the puller. Try to get the puller square with the dampener for proper operation. (Note: If puller is allowed to wonder it can break and cause damage.)

Puller Installed


Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2015-01-07)