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1. Inspect the valve for the following conditions: Burnt or eroded areas (1) A worn margin (2) A bent stem (3) A worn or scored stem (4) A worn key groove (5) A worn stem tip (6) Another important factor is the cooling of the valve head. The recommendations of the equipment manufacturer Valves that are pitted must be refaced to the proper Several different types of equipment are available for DO NOT reface intake valves. Intake valves with
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 100: Inspecting Valve Face For Burning, Pitting & Cracking 2. Inspect the valve face for the following conditions: Worn or no margin (1 or 4) Pitted surfaces (2) Burnt or eroded areas (3)
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 101: Inspecting Valve Margin 3. Inspect the valve margin. The exhaust valve may be refaced if the margin is greater than 1.25 mm (0.05 in) thick
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
before grinding. 4. Reface pitted exhaust valves on a suitable valve refacing machine. 5. Replace the valve if the margin is less than 1.25 mm (0.05 in) thick after grinding. 6. If the valve face has been ground, it may be necessary to shim the valve spring in order to obtain the proper spring installed height. Refer to Cylinder Head Disassemble. 7. Inspect for a loose valve seat in the cylinder head. The valve seat has an interference fit to the cylinder head. 8. Clean the valve guide bores with a suitable tool. Remove all carbon or dirt from the bores. The valve guide must be clean for the seat grinding tool to obtain proper results. 9. Grind the valve seat. The recommendations of the equipment manufacturer should be followed carefully to obtain 10. Inspect the valve seats. The valve seats should be concentric to within 0.05 mm (0.0021 in) total indicator If the valve seat has been ground, it may be necessary to shim the valve spring in order CYLINDER HEAD ASSEMBLE Tools Required J 8062 Valve Spring Compressor - Head Off Assemble
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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