Engine Block

Piston Ring Replacement


  1. Remove the piston from the cylinder block (see page 7-13).
  1. Using a ring expander (A), remove the old piston rings (B).

  1. Clean all ring grooves thoroughly with a squared-off broken ring or ring groove cleaner with a blade to fit the piston grooves.

    The top and 2nd ring grooves are 1.2 mm (0.05 in.) wide. The oil ring groove is 2.0 mm (0.08 in.) wide.

File down a blade if necessary.

Do not use a wire brush to clean the ring grooves, or cut the ring grooves deeper with the cleaning tools.

NOTE: If the piston is to be separated from the connecting rod, do not install new rings yet.

  1. Using a piston, push a new ring (A) into the cylinder bore 15 - 20 mm (0.6 - 0.8 in.) from the bottom.

  1. Measure the piston ring end-gap (B) with a feeler gauge:
  • If the gap is too small, check to see if you have the proper rings for your engine.
  • If the gap is too large, recheck the cylinder bore diameter against the wear limits (see page 7-16).

    If the bore is over the service limit, the cylinder block must be rebored.

Piston Ring End-Gap:

Top Ring

Standard (New):

0.20 - 0.35 mm

(0.008 - 0.014 in.)

Service Limit:

0.60 mm (0.024 in.)

Second Ring

Standard (New):

0.50 - 0.65 mm

(0.020 - 0.026 in.)

Service Limit:

0.75 mm (0.030 in.)

Oil Ring

Standard (New):

0.20 - 0.70 mm

(0.008 - 0.028 in.)

Service Limit:

0.80 mm (0.031 in.)