For 1990-2009 cars

### Removal Procedure

1. Remove the radiator. Refer to Radiator Replacement in Engine Cooling.
2. Remove the valve lifters. Refer to Valve Lifter Replacement .
3. Remove the timing chain and sprocket. Refer to Timing Chain and Sprocket Replacement .
4. Remove the camshaft retainer bolts and retainer.
5. Install three 8-1.25 X 100 mm bolts into the camshaft front bolt holes.
6. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block.
7. Remove the bolts from the front of the camshaft.
8. Clean and inspect the camshaft.

### Installation Procedure

1. Lubricate the following components with clean engine oil, engine oil supplement GM P/N 1052367 (Canadian P/N 992869) or equivalent.

• | The camshaft lobes

• | The camshaft bearing journals

• | The camshaft bearings

| Notice: All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

2. Install three 8-1.25 X 100 mm bolts into the camshaft front bolt holes.
3. Using the bolts as a handle, carefully install the camshaft.
4. Remove the bolts from the front of the camshaft.

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 retainer and bolts.

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

6. Install the timing chain sprocket. Refer to Timing Chain and Sprocket Replacement .
7. Install the valve lifters. Refer to Valve Lifter Replacement .
8. Install the radiator. Refer to Radiator Replacement in Engine Cooling.