1. Raise the hood to the service position, perform the following:

•	Remove the hood hinge bolts (1).

•	Raise the hood until vertical.

•	Install the hood hinge bolts until snug in the service position (2).

2. Remove the radiator support. Refer to Radiator Support Replacement in Body Front End.
3. Remove the front cover. Refer to Engine Front Cover Replacement .
4. Remove the valve lifters. Refer to Valve Lifter Replacement .



5. Remove the camshaft sensor bolt and sensor.



6. Rotate the crankshaft until the timing marks on the crankshaft and camshaft sprockets are aligned.



7. Remove the camshaft sprocket bolts.

Notice: Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

8. Remove the camshaft sprocket and reposition the timing chain.



9. Remove the camshaft retainer bolts and retainer.

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.




10. Remove the camshaft.

10.1.

Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts to the bolt holes in the front of the camshaft.

10.2.

Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block.

10.3.

Remove the three bolts from the camshaft.

11. Clean and inspect the camshaft and bearings. Refer to Camshaft and Bearings Cleaning and Inspection in Engine Mechanical - 4.8 L, 5.3 L, and 6.0 L Unit Repair.

Important: If camshaft replacement is required, the valve lifters must also be replaced.

1. Lubricate the camshaft journals and the bearings with clean engine oil.
2. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts to the bolt holes in the front of the camshaft.

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.

3. Using the bolts as a handle, carefully install the camshaft into the engine block.
4. Remove the three bolts from the front of the camshaft.




Important: Install the retainer plate with the sealing gasket facing the engine block.

The gasket surface on the engine block should be clean and free of dirt and/or debris.

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 25 N·m (18 lb ft).




6. Install the camshaft sprocket and position the timing chain.
7. Install the camshaft sprocket bolts.

Tighten
Tighten the camshaft sprocket bolts to 35 N·m (26 lb ft).




8. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused.
9. Lubricate the O-ring seal with clean engine oil.
10. Install the camshaft sensor and bolt.

Tighten
Tighten the camshaft sensor bolt to 25 N·m (18 lb ft).

11. Install the valve lifters. Refer to Valve Lifter Replacement .
12. Install the front cover. Refer to Engine Front Cover Replacement .
13. Install the radiator support. Refer to Radiator Support Replacement in Body Front End.



14. Remove the hood hinge bolts from the service position (2).
15. Lower the hood to the normal position.
16. Install the hood hinge bolts.

Tighten
Tighten the hood hinge bolts to 25 N·m (18 lb ft).