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Home >> Honda >> 2003 >> Civic HX, Standard >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Overhaul - 1.7L Engine >> Engine Block >> Block and Piston Inspection

Block and Piston Inspection

  1. Remove the crankshaft and pistons (see Oil Pan Removal  ).
  2. Check the piston for distortion or cracks.
  3. Measure the piston diameter at a point 13 mm (0.5 in) from the bottom of the skirt.

    Piston Diameter 

    1. Standard (New): 74.98-74.99 mm (2.9520-2.9524 in).
    2. Service Limit: 74.97 mm (2.9516 in.)

    Oversize Piston Diameter 

    1. 0.25: 75.23-75.24 mm (2.9618-2.9622 in.)
    2. 0.50: 75.48-75.49 mm (2.9716-2.9720 in.)
    Fig 1: Measuring Piston Diameter At A Point 13 mm (0.5 in) From Bottom Of Skirt
    G01397497Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Measure wear and taper in direction X and Y at three levels in each cylinder as shown. If measurements in any cylinder are beyond the oversize bore service limit, replace the block. If the block is to be rebored, refer to step 6 after reboring.

    Cylinder Bore Size 

    1. Standard (New): 75.00-75.02 mm (2.9528-2.9535 in.)
    2. Service Limit: 75.07 mm (2.9555 in.)

    Oversize: 

    1. 0.25: 75.25-75.27 mm (2.9626-2.9634 in.)
    2. 0.50: 75.50-75.52 mm (2.9724-2.9732 in.)

    Reboring limit:  0.5 mm (0.02 in.) max.

    Bore Taper: 

    Limit:  (Difference between first and third measurement) 0.05 mm (0.002 in.)

    Fig 2: Measuring Wear & Taper In Direction X & Y At Three Levels In Each Cylinder
    G01397498Courtesy of AMERICAN HONDA MOTOR CO., INC.
  5. Scored or scratched cylinder bores must be honed.
  6. Check the top of the block for warpage. Measure along the edges and across the center as shown.

    Engine Block Warpage 

    1. Standard (New): 0.07 mm (0.003 in.) max.
    2. Service Limit: 0.10 mm (0.004 in.)
    Fig 3: Measuring Along Edges & Across Center
    G01397499Courtesy of AMERICAN HONDA MOTOR CO., INC.
  7. Calculate the difference between the cylinder bore diameter and the piston diameter. If the clearance is near or exceeds the service limit, inspect the piston and cylinder block for excessive wear.

    Piston-to-Cylinder Clearance 

    1. Standard (New): 0.010-0.040 mm (0.0004-0.0016 in.)
    2. Service Limit: 0.05 mm (0.002 in.)
    Fig 4: Calculating Difference Between Cylinder Bore Diameter & Piston Diameter
    G01397500Courtesy of AMERICAN HONDA MOTOR CO., INC.
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