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HOMESERVICE MANUALSHONDA2011CR-V EX, 2.4 RE4, BZHAREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 71 (ENGINE BLOCK)PISTON RING REPLACEMENT
2011 Honda CR-V EX, 2.4 RE4, BZHA

Piston Ring Replacement

2011 Honda CR-V EX, 2.4 RE4, BZHASECTION Piston Ring Replacement
WARNING: This page is about a different car, the 2009 Honda CR-V, 2008 Honda CR-V, and 2007 Honda CR-V. However, it is still accessible from the selected car via links, so may be relevant.
  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).
    Fig 1: Removing Piston Using Ring Expander
    G06609394Courtesy 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 that fits 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 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
    G06609395Courtesy 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): 0.40-0.55 mm (0.016-0.022 in) 

    Service Limit: 0.70 mm (0.028 in) 

    Oil Ring: 

    Standard (New): 0.25-0.65 mm (0.010-0.026 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 mark, and the second ring (B) has a 2R mark. The manufacturing marks (C) must face upward.
    Fig 3: Identifying Top Ring And Second Ring
    G06609396Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. After installing a new set of rings, measure the ring-to-groove clearances:

    Top Ring Clearance 

    Standard (New): 0.035-0.060 mm (0.0014-0.0024 in) 

    Service Limit: 0.13 mm (0.005 in) 

    Second Ring Clearance 

    Standard (New): 0.030-0.055 mm (0.0012-0.0022 in) 

    Service Limit: 0.13 mm (0.005 in) 

    Fig 4: Measuring Ring-To-Groove Clearances
    G06609398Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Rotate the rings in their grooves to make sure they do not bind.
  9. Position the ring end gaps as shown:
    Fig 5: Positioning Ring End Gaps
    G06609397Courtesy of AMERICAN HONDA MOTOR CO., INC.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.