Piston Ring Replacement
  1. Using a piston that has its rings removed, 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.
      If the bore is beyond the service limit, the engine 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:
    0.70 mm (0.028 in.)
    Oil Ring (RIKEN):
    Standard (New):
    0.20−0.50 mm (0.008−0.020 in.)
    Service Limit:
    0.55 mm (0.022 in.)
    Oil Ring (NIPPON PISTON RING):
    Standard (New):
    0.20−0.70 mm (0.008−0.028 in.)
    Service Limit:
    0.75 mm (0.030 in.)