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2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado OFF-VEHICLE REPAIR INFORMATION (CONT.) CYLINDER BORING AND HONING Boring Procedure 1. Measure all pistons with a micrometer to determine the cylinder bore diameter. 2. Before you use any type of boring bar, use a fine file and clean the top of the cylinder block, removing any dirt or burrs. If you do not check the cylinder block, the boring bar may be 3. Carefully follow the instructions furnished by the manufacturer regarding use of the equipment. 4. When you bore the cylinders, ensure all the crankshaft bearing caps are in place. Tighten the crankshaft bearing caps to the proper torque in order to avoid distortion of the cylinder 5. When you take the final cut with a boring bar, leave 0.03 mm (0.001 in) on the cylinder bore diameter for the finish honing and fit of the piston. Honing Procedure IMPORTANT: A 0.5 mm (0.02 in) oversize service piston and a piston ring set are available.
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
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. 1: View Of Honing Of Cylinders 1. When honing the cylinders, follow the manufacturer's recommendations for equipment use, cleaning, and lubrication. Use only clean, sharp stones of the proper grade for the amount of 2. During the honing operation, thoroughly clean the cylinder bore. Repeatedly check the cylinder bore for fit with the selected piston. All measurements of the piston or the cylinder bore should be made with the components at 3. When honing a cylinder for fit to an oversize piston, first perform the preliminary honing with a 100-grit stone. 4. Perform final cylinder honing with a 240-grit stone and obtain a 45 degree cross hatch pattern. A 240-grit stone is preferred for final honing. If a 240-grit stone is not available, a 220-grit
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
stone may be used as a substitute. 5. The finish marks should be clean but not sharp. The finish marks should also be free from imbedded particles and torn or folded metal. 6. By measuring the selected piston at the sizing point and by adding the average of the clearance specification, you can determine the final cylinder honing dimension required. 7. After final honing and before the piston is checked for fit, clean the cylinder bores with hot water and detergent. Scrub the bores with a stiff bristle brush and rinse the bores thoroughly 8. Perform final measurements of the piston and the cylinder bore. 9. Permanently mark the top of the piston for the specific cylinder to which it has been fitted. 10. Apply clean engine oil to each cylinder bore in order to prevent rusting. Deglazing Procedure
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. 2: Illustrating Deglazing Cylinder Bore Using a ball type or self centering honing tool, deglaze the cylinder bore lightly. Deglazing A 240-grit stone is preferred for final honing. If a 240-grit stone is not available, a 220-grit stone CRANKSHAFT AND BEARING CLEANING AND INSPECTION
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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