Tools Required

J 39084 Rear Crankshaft Oil Seal Installer

1. Important: Before a new seal is installed, the CDR and the crankcase ventilation system should be thoroughly inspected and the crankcase pressure should also be checked. Refer to Engine Controls.

   Remove the transfer case (if equipped). Refer to Transfer Case.

2. Remove the transmission. Refer to Transmission.
3. Remove the flywheel.
4. Remove the oil seal. Do not reuse the old seal.
5. Clean the oil seal bore in the block thoroughly before installing a new oil seal.
6. Inspect the rear portion of the crankshaft where the oil seal makes contact for the following conditions:

•	Wear due to the rubbing action of the oil seal

•	Dirt build up





Important: 

•	The crankshaft surface must be clean and smooth in order to prevent damaging the seal lip when a new oil seal is installed.

•	Because of the rear crankshaft wear or grooving, the service seal will be positioned flush with the rear block face. The position of the new oil seal will be controlled by the J 39084 . Positioning the oil seal in a new location provides a new surface for the oil seal to ride on.

7. Inspect the rear portion of the crankshaft where the oil seal makes contact for wear due to the rubbing action of the oil seal or dirt buildup. Correct as necessary.

Important: Coat the crankshaft surface with clean engine oil, and lightly coat the sealing area of the new oil seal with engine oil before installing the new oil seal. Do not scratch or nick the sealing edge of the oil seal.

1. Install the oil seal, with the spring cavity towards the engine, onto the crankshaft.
2. Using the J 39084 , drive the seal in until the tool bottoms against the block and the crankshaft rear main bearing cap.
3. Install the flywheel.
4. Install the transmission. Refer to Transmission.
5. Install the transfer case (if equipped). Refer to Transfer Case.