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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Mechanical (H4SO)) >> Cylinder Block >> Inspection >> Piston Ring

Piston Ring

WARNING: This page is about a different variant/trim than selected.
  1. If the piston ring is broken, damaged or worn, or if its tension is insufficient, or when the piston is replaced, replace the piston ring with a new part of the same size as the piston.
    CAUTION:
    • Marks are displayed on the end of top and second rings. When installing the rings to piston, face these marks upward.
    • Oil ring consists of the upper rail, expander and lower rail. Be careful about the direction of rail when installing the oil ring to piston.
      Fig 1: Identifying Piston Pin Snap Ring Gap
      G05017200Courtesy of SUBARU OF AMERICA, INC.
  2. Clean the piston ring groove and piston ring.
  3. Squarely place the piston ring and oil ring in cylinder, and measure the piston ring gap with a thickness gauge.
    PISTON RING GAP CHART

    mm (in)
      Standard
    Piston ring gap Top ring 0.20 - 0.35 (0.0079 - 0.0138)
    Second ring 0.37 - 0.52 (0.0144 - 0.0203)
    Oil ring rail 0.20 - 0.50 (0.0079 - 0.0197)
    Fig 2: Measuring Piston Ring Gap
    G04997778Courtesy of SUBARU OF AMERICA, INC.
  4. Measure the clearance between piston ring and piston ring groove with a thickness gauge.
    PISTON RING GAP CHART

    mm (in)
      Standard
    Clearance between piston ring and piston ring groove Top ring 0.040 - 0.080 (0.0016 - 0.0031)
    Second ring 0.030 - 0.070 (0.0012 - 0.0028)
    Fig 3: Measuring Clearance Between Piston Ring And Piston Ring Groove
    G04997779Courtesy of SUBARU OF AMERICA, INC.
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