Dimension & Clearance Specifications - Piston

Allowance for Honing 0.02 mm (0.0008 inch)
Piston Diameter Measurement Point 24.5 mm (0.965 inch) from top
Piston Diameter:
Standard (Mark 1) 80.905-80.915 mm (3.1852-3.1856 inch)
Standard (Mark 2) 80.915-80.925 mm (3.1856-3.1860 inch)
Standard (Mark 3) 80.925-80.935 mm (3.1860-3.1864 inch)
0.50 Undersize 81.405-81.435 mm (3.2049-3.2061 inch)
Piston Oil Clearance:
Standard 0.085-0.105 mm (0.0033-0.0041 inch)
Maximum 0.13 mm (0.0051 inch)
Piston Ring End Gap:
Measurement Point 104 mm (4.09 inch) from top of bore
Top Ring (Standard) 0.25-0.35 mm (0.0098-0.0138 inch)
Top Ring (Maximum Limit) 1.05 mm (0.0413 inch)
Lower Ring (Standard) 0.35-0.50 mm (0.0138-0.0197 inch)
Lower Ring (Maximum Limit) 1.2 mm (0.0472 inch)
Oil Ring (Standard) 0.10-0.40 mm (0.0039-0.0157 inch)
Oil Ring (Maximum Limit) 1.05 mm (0.0413 inch)
Piston Ring Groove Clearance:
Upper Compression Ring 0.045-0.085 mm (0.0018-0.0033 inch)
Lower Compression Ring 0.030-0.070 mm (0.0012-0.0028 inch)