C 1500 Suburban 2WD V8-6.5L DSL Turbo VIN F (1997)
Piston: Testing and Inspection
Measurement
NOTE:
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The piston skirts are barrel shaped so the piston diameter must be measured at a specific gauge point.
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The piston gauge is 65.33 mm (2.575 inch) from the top of the piston.
MEASURING PISTON PIN TO PISTON PIN BUSHING
1. Clean the piston pin and bushing. The parts must be free of oil and dirt. Measure piston pin clearance.
2. Measure the piston pin to bushing following these steps:
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Measure the piston pin diameter.
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Measure the piston pin bushing inside diameter. Use an inside micrometer.
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Subtract the piston pin diameter from the piston pin bushing inside diameter. If the clearance is excessive, try a new piston pin. If the clearance
is excessive with a new piston pin, the connecting rod must be replaced. Replacement bushings are not available. Piston pins are available only
with new pistons.
MEASURING PISTON PIN TO PISTON CLEARANCE
1. Measure the piston pin diameter.
2. Measure the piston pin to piston clearance.
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Measure the piston pin hole diameter.
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Subtract the piston pin diameter from the piston pin hole diameter to obtain the clearance.
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Replace the piston and piston pin if the clearance exceeds specifications. The piston and the piston pin are a matched set and not available
separately.
