Thursday, 9 April 2015

How To Replace Front Main Seal

Crankshaft Seal Replacement - Front

Replacing Crankshaft Seal In Car

Helpful Information
An engine front crankshaft seal is mounted into the front timing cover which rides against the vibration dampener sealing surface. This seal controls oil from leaking to the outside of the engine, once the seal starts leaking it must be replaced. A harmonic balancer or dampener is the common term for a weighted unit used to help an engine run smoothly.
Best Practices
  • Always use top quality seals to avoid premature failure.
  • Clean sealing surfaces to enhance sealing ability.
  • Use high quality silicone sealer

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

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