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Fig. 117: View Of Cylinder Head Gasket Markings 2. The markings on the gasket are as follows: Grade A (1) Grade B (2) Grade C (3) Block over-bored 0.010-0.030 in (0.254-0.762 mm) (4) Block over-bored 0.010-0.030 in (0.254-0.762 mm) and deck milled 0.008 in (0.203
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
mm) (5) 3. The cylinder head gasket thickness is determined by the piston head projection from the cylinder block deck surface. There are cylinder head gaskets available in three different 4. Be sure the piston and cylinder deck are free of carbon, gasket material, or other objects that may give you an erroneous measurement. Fig. 118: Measuring Piston Projection Using J 7872 5. Use J 7872 to measure the piston projection across two different points on each piston. 1. Zero the dial indicator to the cylinder deck surface. 2. Place the dial indicator pointer on the piston top. Be sure the pointer is directly above the piston pin centerline to prevent inaccurate readings from piston rocking.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3. Rotate the engine to roll the piston through Top Dead Center while noting the maximum reading on the dial indicator. 4. Repeat procedure at the second measuring point on the piston. 6. Calculate the average value of piston projection for each cylinder. 7. Obtain the maximum piston projection value for that bank of cylinders. 8. Determine the gasket grade by the maximum piston projection value using the chart. 9. If the difference between the highest measured piston head projection and the lowest measured piston projection, within one bank of cylinders, exceeds 0.1 mm (0.0039 in), then Connecting rod to piston pin clearance Piston to piston pin clearance If any of the above clearances are beyond specifications, then refer to the appropriate section for CYLINDER HEAD INSTALLATION - LEFT SIDE Tools Required J 45059 Angle Meter Installation
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 119: View Of Cylinder Head Gasket Markings NOTE: The left and right cylinder head gaskets are not IMPORTANT: The stamped letter, R or L, must face up. R is the right bank, L is the left bank.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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