For 1990-2009 cars

### Removal Procedure

1. Disconnect the negative battery cable. Refer to

   Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

   in General Information.
2. Remove the transmission assembly. Refer to Transmission Assembly Replacement in Transmission.
3. Remove the manual transmission, clutch and pressure plate and the clutch cover assembly.
4. Remove the bolts attaching the flywheel to the crankshaft.
5. Remove the oil pan to the crankshaft seal housing bolts.
6. Remove the seal housing to block bolts.
7. 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.

8. 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.
9. 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.

### Installation Procedure

#### Tools Required

• | J 36005 Rear Crankshaft Seal Installer

• | J 36660-A Torque Angle Meter

• | J 38122-A Crankshaft Balancer Holder

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 or equivalent. Use only enough sealant to restore the silicone strip to its original dimension.
4. Install the oil pan to the seal housing bolts.

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

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 flywheel.
6. Install the new bolts or apply Adhesive/Sealant Compound GM P/N 12345493 or equivalent to the bolts being re-used.
7. Use the J 38122-A and the J 36660-A when installing the bolts in order to prevent crankshaft rotation.

Tighten
Tighten the bolts to 30 N·m (22 lb ft) and rotate to 45 degrees.

8. Install the manual transmission, clutch and pressure plate and clutch cover assembly. Refer to Transmission.
9. Install the transmission assembly. Refer to Transmission Assembly Replacement in Transmission.
10. Connect the negative battery cable.
11. Start the engine.