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Piston, Pin & Connecting Rod: Inspection

  1. Measure the diameter of the piston pin. See Fig 1 and PISTON PIN DIAMETER  table.
  2. Zero the dial indicator to the piston pin diameter. See Fig 2.
  3. Check the difference between the piston pin diameter and piston pin hole diameter on the piston. See Fig 3 and PISTON PIN-TO-PISTON CLEARANCE  table.
  4. Measure the piston pin-to-connecting rod clearance. See Fig 4 and PISTON PIN-TO-CONNECTING ROD CLEARANCE  table.
    Fig 1: Measuring Diameter Of Piston Pin
    G00294838Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 2: Zeroing Dial Indicator For Piston Pin Diameter
    G00294839Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 3: Measuring Piston Pin bore Diameter
    G00294840Courtesy of AMERICAN HONDA MOTOR CO., INC.
    Fig 4: Measuring Connecting Rod Piston Pin Bore Diameter
    G00294841Courtesy of AMERICAN HONDA MOTOR CO., INC.
    PISTON PIN DIAMETER

    Application Specification - In. (mm)
    Standard (New) .8646-.8648 (21.962-21.965)
    Service Limit .8643 (21.954)
    PISTON PIN-TO-PISTON CLEARANCE

    Application Specification - In. (mm)
    Standard (New) -.00020 To +.00004 (-.0050 To +.0010)
    Service Limit .0002 (.004)
    PISTON PIN-TO-CONNECTING ROD CLEARANCE

    Application Specification - In. (mm)
    Standard (New) .0002-.0006 (.005-.014)
    Service Limit .0007 (.019)