Piston: Testing and Inspection
INSPECTION1. Check the piston for distortion or cracks.
NOTE: If cylinder is bored, an oversized piston must be used.
2. Measure piston diameter at a point 17 mm (0.67 inch) from the bottom of the skirt.
NOTE: There are two standard-size pistons (A = no letter and B). The letter is stamped on the top of the piston. These letters are also stamped on the black as cylinder bore sizes.
- Piston A (no letter) Diameter
- Standard (New): 92.990 - 93.003 mm (3.6610 - 3.6615 inch)
- Service Limit: 92.97 mm (3.6602 inch)
- Piston B Diameter
- Standard (New): 92.980 - 92.993 mm (3.6606 - 3.6611 inch)
- Service Limit: 92.96 mm (3.6598 inch)
3. Calculate the difference between cylinder bore diameter and piston diameter.
- Piston-to-Block Clearance
- Standard (New): 0.007 - 0.030 mm (0.0002 - 0.0012 inch)
- Service Limit: 0.0785 mm (0.0031 inch)