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Scoring in the piston pin area (3) Cracks (1) Broken ring groove lands Fig. 3: Measuring Piston Ring End Gap
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Courtesy of GENERAL MOTORS CORP. 3. Measure the piston ring end gap. Use a piston to square the piston ring near the top of the cylinder. Use a feeler gauge to measure the piston ring gap. The 1st compression ring production gap is 0.30-0.45 mm (0.0118-0.0177 in) and the The 2nd compression ring production gap is 0.50-0.65 mm (0.0197-0.0256 in) and the The oil ring production gap is 0.15-0.35 mm (0.0059-0.0138 in) and the service limit Replace the piston ring if the measured value exceeds the service limit. Fig. 4: Measuring Piston Ring Side Clearance 4. Measure the piston ring to piston ring groove clearance.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Use a feeler gauge to measure the clearance between the piston ring and the piston ring The 1st compression ring production clearance is 0.08-0.17 mm (0.0030-0.0007 in) The 2nd compression ring production clearance is 0.01-0.03 mm (0.0004-0.0012 in) The oil ring production clearance is 0.01-0.03 mm (0.0004-0.0012 in) and the service Replace the piston ring if the measured value exceeds the service limit. Fig. 5: Measuring Piston Pin Diameter 5. Measure the piston pin outside diameter.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Measure the piston pin outside diameter at several points. The production value is 34.495-34.50 mm (1.3581-1.3563 in) and the service limit is Replace the piston pin if the measured value is less than the service limit. Fig. 6: Measuring Piston Pin Bore 6. Measure the piston pin to piston pin bore clearance. Measure the piston pin bore.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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