Rear Crankshaft Main Bearing Seal: Service and Repair

Crankshaft Rear Oil Seal Replacement

Tools Required

EN-48108 Rear Main Oil Seal Installer

Removal Procedure

Important: Do not nick the crankshaft sealing surface when removing the seal.

1. Remove the flywheel.
2. Remove the crankshaft rear main oil seal using one of the following techniques:




3. If removing the new style seal - seal lip facing outward, insert a flat-bladed or similar tool between the sealing lip and the outer casing of the seal at an angle, and gently pry the seal out be moving the tool towards the center of the crankshaft.




4. If removing an old style seal - seal lip faces inward, insert a flat-bladed or similar tool between the outer seal casing and the engine block casting and gently pry the seal out.
5. Repeat the above steps as necessary around the crankshaft rear oil seal, until the seal is removed.

Installation Procedure




1. The EN-48108 tool has a unique design to allow the technician to easily install the rear main seal squarely to the correct depth and direction. Before proceeding with the installation, review the illustration to become familiar with the following components:

* Mandrel (1)
* Drive Drum (2)
* Drive Nut (3)
* Washer (4)
* Bearing (5)




2. Align the mandrel dowel pin to the dowel pin hole in the crankshaft.




3. Using a large flat-bladed screwdriver, tighten the 2 mandrel screws to the crankshaft, ensuring the mandrel is snug to the crankshaft hub.




4. Install the rear main seal, with the protective nylon sleeve attached, onto the mandrel.




5. Install the outer drive drum onto the mandrel.
6. Install the bearing, washer, and the drive nut onto the threaded shaft.




7. Using a wrench, turn the drive nut on the mandrel, which will push the seal into the engine block bore.
8. Turn the wrench until the drive drum is snug and flush against the engine block.
9. Loosen and remove the drive nut, washer, bearing and drive drum. Discard the nylon plastic seal protector.
10. Verify that the seal has seated properly.




11. Use a flat-bladed screwdriver to remove the 2 attachment screws from the mandrel and remove the mandrel from the crankshaft hub.