Piston Ring, Engine

Ring groove width
Compression (top) 1.230-1.245mm (0.0484-0.0490 inch)
Compression (bottom) 1.530-1.545mm (0.0602-0.0608 inch)
Oil ring 3.030-3.055mm (0.1192-0.0120 inch)
Side clearance
Compression (top) 0.040-0.075mm (0.0015-0.0029 inch)
Compression (bottom) 0.040-0.085mm (0.0015-0.0033 inch)
Oil ring Snug Fit
Service limit 0.10mm (0.0039 inch)
Compression (top)-service limit 0.50mm (0.0196 inch) Max
Compression (bottom)-service limit 0.65mm (0.0255 inch) Max
Oil ring (steel rail)-service limit 0.90mm (0.0354 inch) Max
Piston ring gap (Specification 82.4 mm (3.2441 inch) diameter gauge.)
Compression (top)-gauge diameter 0.100-0.250mm (0.0039-0.0098 inch)
Compression (bottom)-gauge diameter 0.27-0.42mm (0.0106-0.0165 inch)
Oil ring (steel rail)-gauge diameter 0.15-0.65mm (0.0059-0.0255 inch)
Compression (top)-service limit 0.50mm (0.0196 inch) Max
Compression (bottom)-service limit 0.65mm (0.0255 inch) Max
Oil ring (steel rail)-service limit 0.90mm (0.0354 inch) Max