Piston Dimensions & Clearances

DIMENSIONS
Piston Diameter:
Standard:
Piston Size 79.47 mm (3.1287 inch)
Bore Size 79.51 mm (3.1303 inch)
1st Oversize:
Piston Size 79.72 mm (3.1385 inch)
Bore Size 79.76 mm (3.1402 inch)
2nd Oversize:
Piston Size 79.97 mm (3.1484 inch)
Bore Size 80.01 mm (3.1500 inch)

Piston Ring Groove Clearance:
New:
1st Compression Ring 0.06-0.09 mm (0.0024-0.0036 inch)
2nd Compression Ring 0.05-0.08 mm (0.0020-0.0032 inch)
Oil Scraper Ring 0.03-0.06 mm (0.0012-0.0024 inch)
Wear Limit:
1st Compression Ring 0.25 mm (0.0098 inch)
2nd Compression Ring 0.25 mm (0.0098 inch)
Oil Scraper Ring 0.15 (0.0059 inch)

Piston Ring End Gap:
New:
1st Compression Ring 0.20-0.40 mm (0.0078-0.0157 inch)
2nd Compression Ring 0.20-0.40 mm (0.0078-0.0157 inch)
Oil Scraper Ring 0.25-0.50 mm (0.0098-0.01974 inch)
Wear Limit:
1st Compression Ring 1.0 mm (0.039 inch)
2nd Compression Ring 1.0 mm (0.039 inch)
Oil Scraper Ring 1.0 mm (0.039 inch)