Tools Required

1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.



2. Remove the flywheel. Refer to Engine Flywheel Replacement in Engine Mechanical.



3. Remove the oil pan to the crankshaft seal housing bolts.
4. Remove the seal housing to block bolts.
5. Remove the seal housing and gasket.

Notice: Properly support the seal housing to prevent damage to the seal during removal. Damage to the seal will result in an oil leak.

6. Support the seal housing for the seal removal using two wood blocks of equal thickness. With the wood blocks on a flat surface, position the seal housing and the blocks so that the transmission side of the seal housing is supported across the dowel pin and center bolt holes on both sides of the seal opening.
7. Drive the crankshaft seal evenly out of the transmission side of the seal housing using a small chisel in the relief grooves on the crankshaft side of the seal housing.

1. Replace the oil pan gasket if any of the following conditions exist:

•	Cuts or nicks

•	Deformation

•	Separation from the aluminum carrier

2. Inspect the strips of silicone across the top of the aluminum carrier at the oil pan, at the cylinder block, and at the seal housing three way joint.
3. If these strips are damaged they may be repaired using Silicone Sealant GM P/N 12345739 (Canadian P/N 10953541) or equivalent. Use only enough sealant to restore the silicone strip to its original dimension.
4. Install seal into housing using the following steps:

•	Lightly grease seal lip.

•	Tap seal into housing using plastic hammer, make sure seal seats in housing.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

5. Install the oil pan to the seal housing bolts.

Tighten
Tighten the bolts to 12 N·m (106 lb in).




6. Install the flywheel. Refer to Engine Flywheel Replacement in Engine Mechanical.
7. For vehicle equipped with a manual tranmission, install the clutch and pressure plate and clutch cover assembly. Refer to Clutch Pressure and Driven Plate Replacement in Clutch.
8. Install the transmission assembly. Refer to Transmission Replacement in Manual Transmission - M5 and M86, or Transmission Replacement in Automatic Transaxle-4T40 - E/4T45 - E.
9. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
10. Start the engine.