REMOVAL & INSTALLATION
See Figure 1
Either the engine or the transmission must be removed to replace the rear main seal. Most engines, other than the 2.3L and 2.6L, have one-piece rear crankshaft oil seals. The oil pan does not have to be removed to access the seal.
- Disconnect the negative battery cable. Raise and safely support the vehicle.
- Drain the engine oil and remove the oil pan.
- If equipped with an automatic transmission, remove the transmission. If equipped with a manual transmission, remove the transmission and clutch assembly.
- Remove the starter without disconnecting the wires and secure it aside.
- Remove the flywheel-to-crankshaft bolts and the flywheel.
- Carefully, remove the oil seal, using a small prybar; work the tool around the diameter of the seal until the seal begins to lift out. Use care not to damage the seat and area around the seal.
- Fill the space between the seal lips with grease and lubricate the seal lips with clean engine oil. Install the new oil seal.
- Install the flywheel, transmission and starter motor.
- Connect the battery cable, start the engine and check for leaks.
See Figure 2
Both halves of the rear main oil seal can be replaced without removing the crankshaft. Always replace the upper and lower seal together. The lip should face the front of the engine. Be very careful that you do not break the sealing bead in the channel on the outside portion of the seal while installing it. An installation tool can be fabricated to protect the seal bead.
- Remove the oil pan and rear main bearing cap.
- Remove the oil seal from the bearing cap by prying it out.
- Remove the upper half of the seal with a small punch. Drive it around far enough to be gripped with pliers. Be very careful not to damage the crankshaft sealing surface.
- Clean the crankshaft and bearing cap.
- Coat the lips and bead of the seal with light engine oil, keeping oil from the ends of the seal.
- Position the a suitable tool between the crankshaft and seal seat.
- Position the seal between the crankshaft and tip of the tool so that the seal bead contacts the tip of the tool. The oil seal lip should face forward.
- Roll the seal around the crankshaft using the tool to protect the seal bead from the sharp corners of the crankcase.
- The installation tool should be left installed until the seal is properly positioned with both ends flush with the block.
- Remove the tool.
- Install the other half of the seal in the bearing cap using the tool in the same manner as before. Light thumb pressure should install the seal.
- Install the bearing cap with sealant applied to the mating areas of the cap and block. Keep sealant from the ends of the seal.
- Torque the rear main bearing cap to specifications.
- Install the oil pan and refill the engine with oil. Start the engine and check for leaks.