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Piston Ring

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

Check for side clearance.
If the limit is exceeded, replace the ring or piston, or both.
1. Standard value:
  1. No.1: 0.03 - 0.07 mm (0.0012 - 0.0028 inch)
  2. No.2: 0.02 - 0.06 mm (0.0008 - 0.0024 inch)
2. Limit:
  1. No.1: 0.1 mm (0.0039 inch)
  2. No.2: 0.1 mm (0.0039 inch)
Fig 1: Checking Side Clearance
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Install the piston ring into the cylinder bore. Force the ring down with a piston, the piston crown being in contact with the ring, to correctly position it at right angles to the cylinder wall. Then, measure the end gap with a feeler gauge.

Fig 2: Measuring Piston Ring End Gap
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

If the end gap is excessive, replace the piston ring.
1. Standard value:
  1. No.1 ring: 0.15 - 0.30 mm (0.0059 - 0.0118 inch)
  2. No.2 ring: 0.40 - 0.55 mm (0.0157 - 0.0217 inch)
  3. Oil ring: 0.10 - 0.35 mm (0.0039 - 0.0138 inch)
2. Limit:
  1. No.1, No.2 ring: 0.8 mm (0.031 inch)
  2. Oil ring: 1.0 mm (0.039 inch)