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Home >> Subaru >> 2005 >> Outback R VDC Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (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 one of the same size as the piston.
    CAUTION:
    • Mark is displayed on the end of top and second rings. When installing the rings to the 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: Locating Ring Marks
    G03828108Courtesy 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.
    RING GAP REFERENCE

      Standard mm (in)
    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 With A Thickness Gauge
    G03828109Courtesy of SUBARU OF AMERICA, INC.
  4. Measure the clearance between piston ring and piston ring groove with a thickness gauge.
CLEARANCE REFERENCE

  Standard mm (in)
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 With Thickness Gauge
G03828110Courtesy of SUBARU OF AMERICA, INC.
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