Piston Rings

WARNING: This page is about a different variant/trim than selected.

Check clearance between piston rings and ring grooves. If the limit is exceeded, replace piston rings or piston, or both.
Standard value:

Number 1 ring: 0.03 - 0.07 mm (0.001 - 0.003 inch)

Number 2 ring: 0.03 - 0.07 mm (0.001 - 0.003 inch)

Limit: 0.1 mm (0.004 inch)

Fig 1: Checking Clearance Between Piston Rings And Ring Grooves
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Put piston rings into the cylinder bore, press them against the piston top face, and push them in. After achieving squareness, measure the end gap with a free gauge. If the end gap is excessive, replace piston rings.
Standard value:

Number 1 ring: 0.15 - 0.25 mm (0.006 - 0.011 inch)

Number 2 ring: 0.25 - 0.40 mm (0.010 - 0.016 inch)

Oil ring: 0.10 - 0.35 mm (0.004 - 0.014 inch)

Limit:

Number 1 ring: 0.8 mm (0.03 inch)

Number 2 ring: 0.8 mm (0.03 inch)

Oil ring: 1.0 mm (0.04 inch)

Fig 2: Identifying End Gap With Free Gauge
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.