For 1990-2009 cars

## Valve Rocker Arm Cover Replacement Left

### Removal Procedure

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.

1. Disconnect the negative battery cable.
2. Partially drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
3. Remove the rear ignition wire harness at the upper intake manifold and at the spark plugs.
4. Remove the heater bypass intake.
5. Disconnect the positive crankcase ventilation (PCV) vacuum hose.
6. Remove the valve rocker cover bolts.
7. Remove the valve rocker cover.

Bump the end of the valve rocker cover with the palm of your hand or a soft rubber mallet if the cover adheres to the cylinder head.

8. Clean the sealing surface on the cylinder head and the valve rocker cover with degreaser.

### Installation Procedure

1. Install a new gasket and new bolt grommets to the valve rocker cover. Ensure that the gasket is seated properly in the valve groove.
2. Apply sealant at the cylinder head to the lower intake manifold joint at the rear of the lower intake manifold (1).

Important: Apply sealant GM P/N 12345739 or the equivalent at the cylinder head to the lower intake manifold joint.

3. Apply sealant at the cylinder head to the lower intake manifold joint at the front of the lower intake manifold (1).
4. Apply sealer in the notch on the cover. Use GM P/N 1052917 or the equivalent.
5. Install the valve rocker cover.
6. Connect the PCV valve vacuum line.

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.

7. Install the valve rocker cover bolts.

Tighten
Tighten the bolts to 10 N·m (89 lb in).

8. Install the heater bypass tube..
9. Install the rear ignition wire harness.
10. Connect the negative battery cable.

## Valve Rocker Arm Cover Replacement Right

### Removal Procedure

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.

1. Disconnect the negative battery cable.
2. Remove the drive belt. Refer to Drive Belt Replacement .
3. Remove the generator. Refer to Generator Replacement .
4. Remove the generator bracket. Refer to Generator Bracket Replacement .
5. Remove the right (rear) spark plug wires. Refer to Spark Plug Wire Harness Replacement .
6. Remove the ignition coil bracket with the coils, the purge solenoid and the vacuum canister solenoid. Refer to Ignition Coil Replacement in Engine Controls - 3.4L.
7. Remove the vacuum hose from the grommet in the right (rear) valve rocker arm cover.
8. Remove the drive belt tensioner. Refer to Drive Belt Replacement .
9. Remove the right (rear) valve rocker arm cover bolts.
10. Remove the right (rear) valve rocker arm cover.
11. Remove the right (rear) valve rocker arm cover gasket.
12. Clean the valve rocker arm cover.
13. Clean the valve rocker arm cover gasket sealing surfaces on the cylinder head and the lower intake manifold.

### Installation Procedure

1. Install a new right (rear) valve rocker arm cover gasket.

Important: Apply sealant GM P/N 12345739 or the equivalent at the cylinder head to lower intake manifold joint.

2. Apply sealant at the cylinder head to lower intake manifold joint at the rear of the lower intake manifold (1).

Important: Apply sealant GM P/N 12345739 or the equivalent at the cylinder head to lower intake manifold joint.

3. Apply sealant at the cylinder head to lower intake manifold joint at the front of the lower intake manifold (1).

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.

4. Install the right (rear) valve rocker arm cover.

Hand tighten the right (rear) valve rocker arm cover bolts.

Tighten
Tighten the valve rocker arm cover bolts to 10 N·m (89 lb in).

5. Install the vacuum hose to the grommet in the right (rear) valve rocker arm cover.
6. Install the ignition bracket with coils, the purge solenoid and the vacuum canister solenoid. Refer to Ignition Coil Replacement in Engine Controls - 3.4L.
7. Install the right (rear) spark plug wires. Refer to Spark Plug Wire Harness Replacement .
8. Install the generator bracket. Refer to Generator Bracket Replacement in Engine Electrical.
9. Install the generator. Refer to Generator Replacement in Engine Electrical.
10. Install the drive belt. Refer to Drive Belt Replacement .

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.

11. Connect the negative battery cable.