Piston Ring Gap and Groove Clearances

DIMENSIONS
Side Clearance
Standard Value:
No. 1 0.04-0.08 mm (0.00150-0.0031 inch)
No. 2 0.03-0.07 mm (0.00120-0.0027 inch)
Service Limit 0.10 mm (0.0040 inch)
End Gap:
Standard Value:
No. 1 0.23-0.38 mm (0.0090-0.0149 inch)
No. 2 0.33-0.48 mm (0.0130-0.0189 inch)
Oil Ring Side Rail 0.20-0.60 mm(0.0078-0.0236 inch)
Service Limit 1 mm (0.0394 inch)
Service (Over) Size
1st. 0.25 mm (0.0100 inch)
2nd. 0.50 mm (0.0200 inch)
3rd. 0.75 mm (0.0300 inch)
4th. 1.00 mm (0.0390 inch)