Pistons, Pins and Rings

Piston Diameter (Std.) 3.1882-3.1886 inches
Piston Clearance 0.0004-0.0016 inches
Piston Pin Diameter 0.8265-0.8268 inches
Piston Pin To Piston Clearance 0.0004-0.0009 inches
Piston Ring End Gap:
Top [01]
Second 0.012-0.018 inches
Oil [02]

Piston Ring To Groove Clearance
Top Ring 0.0018-0.0028 inches
Second Ring [03]

[01] -- Riken piston ring, 0.008-0.014 inches; Teikoku piston ring, 0.008-0.014 inches.
[02] -- Riken piston ring, 0.008-0.020 inches; Teikoku piston ring, 0.0008-0.0018 inches.
[03] -- Riken piston ring, 0.0016-0.0026 inches; Teikoku piston ring, 0.0018-0.0028 inches.