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Fig. 19: Measuring Valve Stem To Guide Clearance 12. If the valve stem to guide clearance is over 0.25 mm (0.098 in) for the exhaust valve guides or 0.20 mm (0.0079 in) for the intake valve guides, the cylinder head must be replaced. 13. Inspect the valves for the following: Bent valve stem Scored valve stem Worn valve key grooves Pitted surfaces
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 20: Measuring Valve Margin 14. Measure the valve margin. The intake valve production margin is 1.2 mm (0.0472 in) and the service limit is 0.88 mm (0.0346 in). The exhaust valve production margin is 1.0 mm
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 21: Measuring Valve Depression 15. Measure the valve depression. 1. Insert a new valve into the cylinder head (1). 2. Use a depth gage or a straight edge to measure the valve depression from the cylinder head gasket surface (2). The intake valve depression is 0.6 mm (0.0236 in) and the
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 22: Measuring Valve Contact Width 16. Measure the valve contact width. Inspect the valve contact area for roughness or unevenness. The intake valve contact width is 2.1 mm (0.0827 in) and the service limit is 2.5 mm The exhaust valve contact width is 2.1 mm (0.0827 in) and the service limit is 2.5 mm Recondition the valve seats to bring the contact width into specifications. VALVE AND SEAT GRINDING
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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