Rear Main Oil Seal

REMOVAL & INSTALLATION

MPV Models

1. Disconnect the negative battery cable.
2. Raise and support the vehicle safely.
3. Remove the transmission.
4. If equipped with a manual transmission, remove the pressure plate, the clutch disc and the flywheel. If equipped with an automatic transmission, remove the drive plate from the crankshaft.
5. Using a razor blade, carefully cut the oil seal lip.
6. Using a small prying tool protected with a rag, remove the oil seal.

   Fig. 1: Remove the rear seal using a small prying tool

   Fig. 2: Using a seal driver tool to install the rear main oil seal

   To install:

7. Apply clean engine oil to the new seal.
8. Push the new oil seal slightly into place by hand.
9. Using a seal driver and a hammer, tap the oil seal in evenly.
10. Install the driveplate.
11. Install the transmission.
12. Lower the vehicle.
13. Connect the negative battery cable.

B Series Pick-up and Navajo Models

If the crankshaft rear oil seal replacement is the only operation being performed, it can be done in the vehicle as detailed in the following procedure. If the oil seal is being replaced in conjunction with a rear main bearing replacement, the engine must be removed from the vehicle and installed on a work stand.

1. Remove the transmission from the vehicle, following the procedures in Section 7.
2. On a manual shift transmission, remove the pressure plate and cover assembly and the clutch disc following the procedure in Section 7.
3. Remove the flywheel and engine rear cover plate.
4. Use an awl to punch two holes in the crankshaft rear oil seal. Punch the holes on opposite sides of the crankshaft and just above the bearing cap to cylinder block split line. Install a sheet metal screw in each hole. Use two large screwdrivers or small pry bars and pry against both screws at the same time to remove the crankshaft rear oil seal. It may be necessary to place small blocks of wood against the cylinder block to provide a fulcrum point for the pry bars. Use caution throughout this procedure to avoid scratching or otherwise damaging the crankshaft oil seal surface.

   To install:

5. Clean the oil seal recess in the cylinder block and main bearing cap.
6. Clean, inspect and polish the rear oil seal rubbing surface on the crankshaft. Coat a new oil seal and the crankshaft with a light film of engine oil. Start the seal in the recess with the seal lip facing forward and install it with the following special seal driver tool, or equivalent:

   Fig. 3: Installation of rear main seal and installed height

   • 2.3L engine — 49-UN01-070
   • 2.5L engine — 49-UN01-170
   • 3.0L engine — 49-UN01-064
   • 4.0L engine — 49-UN01-009
7. Keep the tool straight with the centerline of the crankshaft and install the seal until the tool contacts the cylinder block surface. Remove the tool and inspect the seal to be sure it was not damaged during installation.
8. Inspect the installed height of the seal. The height should measure 0.02 inch (0.5mm) for the 2.3L, 2.5L and 3.0L engines, and 0.421–0.425 inch (10.7–10.9mm) for the 4.0L engine.
9. Install the engine rear cover plate.
10. Install the flywheel.
11. On a manual shift transmission, install the clutch disc and the pressure plate assembly following the procedure in Section 7.
12. Install the transmission, following the procedure in Section 7.