Operation CHARM: Car repair manuals for everyone.

Piston Ring, Engine

Piston Ring Gap
-- Specification 82.4 mm diameter gauge
Compression (Top)-Gauge Diameter 0.100 - 0.250 Millimeter (mm)
Compression (Bottom)-Gauge Diameter 0.27 - 0.42 Millimeter (mm)
Oil Ring (Steel Rail)-Gauge Diameter 0.15 - 0.65 Millimeter (mm)
Compression (Top) Service Limit 0.50 Millimeter (mm)
Compression (Bottom)-Service Limit 0.65 Millimeter (mm)
Oil Ring (Steel Rail)-Service Limit 0.90 Millimeter (mm)
Side Clearance Compression (top) 0.040-0.075 Millimeter (mm)
Compression (bottom) 0.040-0.085 Millimeter (mm)
Oil Ring Snug Fit
Service Limit 0.010 Millimeter (mm)