For 1990-2009 cars only
Tools Required
J 8087 Cylinder Bore Gauge
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 reinstalled if, after cleaning and inspection, they are within specifications.- Inspect the engine block cylinder bore.
- Inspect the piston and the piston pin.
- Use a J 8087 in order to measure the cylinder bore diameter. Measure at a point 64 mm (2.5 in) from the top of the cylinder bore.
- Measure the J 8087 with a micrometer and record the reading.
- With a micrometer or caliper at a right angle to the piston, measure the piston 25.6 mm (1.007 in) from the top of the piston.
- Subtract the piston diameter from the cylinder bore diameter in order to determine piston-to-bore clearance.
- If the proper clearance cannot be obtained, select another piston and measure for the clearances.
- If the proper fit cannot be obtained, hone the cylinder bore or replace the cylinder block.
- When the piston-to-cylinder bore clearance is within specifications, mark the top of the piston using a permanent marker for installation to the proper cylinder.
Refer to Engine Block Cleaning and Inspection in Engine Mechanical.
Refer to Piston, Connecting Rod, and Bearing Cleaning and Inspection in Engine Mechanical.
Standard Piston-to-Bore Clearance
Standard Clearancer: 0.065-0.088 mm (0.0026-0.0035 in)
Maximum Piston-to-Bore Clearance
Maximum Clearance: 0.10 mm (0.0039 in)
Refer to Separating Parts in Engine Mechanical.
