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Home >> Acura >> 2009 >> TSX Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Block (4-CYL) >> Piston Ring Replacement

Piston Ring Replacement

  1. Remove the piston from the engine block (see CRANKSHAFT AND PISTON REMOVAL )
  2. Using a ring expander (A), remove the old piston rings (B)
    3. Fig 1: Removing Old Piston Rings Using Ring Expander
    G05991975Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. 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 the new rings yet
  4. 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
    Fig 2: Pushing Ring Into Cylinder Bore
    G05991976Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. 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 BLOCK AND PISTON INSPECTION ) 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 75 mm (0.030 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) 

  6. Install the top ring and the second ring as shown The top ring (A) has a 1R or 1N mark, and the second ring (B) has a 2RN or 2N mark The manufacturing marks (C) must face upward
    Fig 3: Identifying Top Ring And Second Ring Grooves
    G05991977Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Rotate the rings in their grooves to make sure they do not bind
  8. Position the ring end gaps as shown.
    Fig 4: Positioning Of Ring End Gaps
    G05991978Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. After installing a new set of rings, measure the ring-to-groove clearances

    Top Ring Clearance 

    Standard (New). 0.060-0 085 mm (0 0024-0 0033 in) 

    Service Limit. 0 13 mm (0 005 in) 

    Second Ring Clearance 

    Standard (New) 0 040-0.065 mm (0 0016-0 0026 in) 

    Service Limit 0.13 mm (0.005 in.) 

    Fig 5: Measuring Ring-To-Groove Clearances
    G05991979Courtesy of AMERICAN HONDA MOTOR CO., INC.
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