Piston: Testing and Inspection

Piston Inspection

1. Check the piston for distortion or cracks.

NOTE: If a cylinder is bored, an oversized piston must be used.

2. Measure the piston diameter at a point 16.0 mm (0.63 inch) from the bottom of the skirt.
- Piston Diameter:
- Standard (New): 85.975-85.985 mm (3.3848-3.3852 inch)
- Service Limit: 85.965 mm (3.3844 inch)






3. Calculate the difference between the cylinder bore diameter (as shown) and piston diameter.
- Piston-to-Block Clearance:
- Standard (New): 0.015-0.040 mm (0.0006-0.0016 inch)
- Service Limit: 0.08 mm (0.003 inch)
- Oversize Piston Diameter:
- 0.25: 86.225 86.235 mm (3.3947-3.3951 inch)
- 0.50: 86.475-86.485 mm (3.4045-3.4049 inch)