Piston Ring, Engine

PISTON RINGS
Piston Ring Gap Clearance
Compression Rings 0.25 - 0.51 mm (0.010 - 0.020 in.)
Oil Control Steel Rails 0.25 - 0.64 mm (0.010 - 0.025 in.)
Piston Ring Side Clearance
Compression Rings 0.025 - 0.081 mm (0.001 - 0.0032 in.)
Preferred 0.025 mm (0.001 in.)
Oil Control Ring 0.025 - 0.241 mm (0.001 - 0.0095 in.)
Preferred 0.08 mm (0.003 in.)
Piston Ring Groove Height
Compression Rings 2.019 - 2.045 mm (0.0795 - 0.0805 in.)
Oil Control Ring 4.78 - 4.80 mm (0.1880 - 0.1895 in.)
Piston Ring Groove Diameter
Compression Rings 88.30 - 88.55 mm (3.476 - 3.486 in.)
Oil Control Ring 90.35 - 90.60 mm (3.557 - 3.566 in.)