For 1990-2009 cars

### Removal Procedure

1. Remove the intake plenum. Refer to Intake Plenum Replacement .
2. Remove the intake manifold. Refer to Intake Manifold Replacement .
3. Remove the right ignition coil. Refer to Ignition Coil Replacement - Bank 1 in Engine Controls - 3.0L (L81).
4. Remove the knock sensor wire harness nut and bracket.
5. Remove the camshaft cover bolts.
6. Remove the camshaft cover.
7. Remove the camshaft cover seals.

Important: Ensure all 8 sealing O-rings are accounted for. The O-rings may stick to the camshaft bearing caps or they may fall into the oil return journals in the cylinder head.

8. Clean the camshaft cover.
9. Clean the sealing surfaces.

### Installation Procedure

1. Lightly coat new seals, including the O-rings, with engine oil prior to installation to assist in holding the O-ring seals to the camshaft cover.
2. Install the camshaft cover seals.
3. Apply a thin coat of silicone sealer GM P/N 12345997 at the front and at the back of the seals.
4. Install the camshaft cover to the cylinder head.

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 camshaft cover bolts.

Tighten
Tighten the camshaft cover bolts to 8 N·m (71 lb in).

6. Install the knock sensor wire harness bracket and nut.

Tighten
Tighten the knock sensor wire harness bracket nut until fully seated and not stripped.

7. Install the right ignition coil. Refer to Ignition Coil Replacement - Bank 1 in Engine Controls - 3.0L (L81).
8. Install the intake manifold. Refer to Intake Manifold Replacement .
9. Install the intake plenum. Refer to Intake Plenum Replacement .