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Courtesy of GENERAL MOTORS CORP. 2. Insert the bore gauge into the micrometer and zero the bore gauge dial. 3. Use the J 8087 or equivalent and measure the cylinder bore for taper, out-of-round, and oversize. See Special Tools and Equipment . Slide the bore gauge up and down throughout the length of the cylinder bore. Check the bore both parallel A 6.0L cylinder bore that measures 101.618-101.636 mm (4.0007-4.0014 in) may be honed and serviced A cylinder bore that exceeds the maximum diameter must be serviced with an oversized piston. 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 improperly positioned, tilted, 3. Carefully follow the instructions furnished by the manufacturer regarding use of the equipment. 4. When you bore the cylinders, make sure 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 bores during final 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 for the 6.0 liter engine.
2004 Hummer H2 2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2
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