Envoy 2WD V8-5.3L VIN P (2004)
Piston: Service and Repair
Piston Selection
Important: Measurements of all components should be taken with the components at normal room temperature. For proper piston fit, the engine block
cylinder bores must not have excessive wear or taper.
A used piston and pin set may be installed if, after cleaning and inspection, they are within specifications.
1. Inspect the engine block cylinder bore for scoring or other damage.
2. Inspect the piston and the piston pin.
3. With the micrometer at a right angle to the piston, measure the piston. Measure the pistons 43 mm (1.69 inch) from the crown.
4. Record the piston diameter.
5. Adjust the micrometer to the recorded piston diameter.
6. Insert the bore gage into the micrometer and zero the bore gage dial.
