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Home >> Subaru >> 2006 >> Baja Turbo, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Mechanical (H4SO)) >> Cylinder Block >> Inspection >> Piston Ring

Piston Ring

WARNING: This page is about a different variant/trim than selected.
  1. If piston ring is broken, damaged, or worn, or if its tension is insufficient, or when the piston is replaced, replace piston ring with a new one of the same size as the piston.
    CAUTION:
    • Marks are shown on the end of the top and second rings. When installing the rings to the piston, face this mark upward.
    • Oil ring consists of upper rail, expander and lower rail. When installing on piston, be careful of each rail's direction.
      Fig 1: Identifying Piston Ring Gap
      G04988416Courtesy of SUBARU OF AMERICA, INC.
  2. Clean piston ring grove and piston ring.
  3. Squarely place piston ring and oil ring in cylinder, and measure the piston ring gap with a thickness gauge.
    PISTON RING CHART (1 OF 2)

    Unit: mm (in)
        Standard Limit
    Piston ring gap Top ring 0.20 - 0.35 (0.0079 - 0.0138) 1.0 (0.039)
    Second ring 0.37 - 0.52 (0.0146 - 0.0205) 1.0 (0.039)
    Oil ring rail 0.20 - 0.50 (0.0079 - 0.0197) 1.5 (0.059)
    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 CHART (2 OF 2)

    Unit: mm (in)
        Standard Limit
    Clearance between piston ring and piston ring groove Top ring 0.040 - 0.080 (0.0016 - 0.0031) 0.15 (0.0059)
    Second ring 0.030 - 0.070 (0.0012 - 0.0028) 0.15 (0.0059)
    Fig 3: Measuring Clearance Between Piston Ring And Piston Ring Groove
    G04997779Courtesy of SUBARU OF AMERICA, INC.
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