Piston Selection
WARNING: This page is about a different variant/trim than selected.
- Inspect the engine block cylinder bore. Refer to Engine Block Cleaning and Inspection .
- Inspect the piston and the piston pin.
- Use a bore gauge (1) and measure the cylinder bore diameter. Measure at a point 64 mm (2.5 in) from the top of the cylinder bore.
- Measure the bore gauge with a micrometer (1) and record the reading.
- With a micrometer (2) or caliper at a right angle to the piston (1), measure the piston 14 mm (0.570 in) from the bottom of the skirt.
- Subtract the piston diameter from the cylinder bore diameter in order to determine piston-to-bore clearance.
- For proper piston-to-bore clearance. Refer to Engine Mechanical Specifications (LEA, or LUK) .
- 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 Separating Parts .
NOTE:
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.