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Connecting Rod Big End Bore Code Locations

  1. 2. Each rod has a tolerance range from 0 to 0.024 mm (0.0009 in.), in 0.006 mm (0.0002 in.) increments, depending on the size of its big end bore. It is then stamped with a number or bar (1,2,3, or 4/I, II, III, or IIII) indicating the range. You may find any combination of numbers and bars in any engine. (Half the number or bar is stamped on the bearing cap, the other half is on the rod.)

    If you can't read the code because of an accumulation of oil and varnish, do not scrub it with a wire brush or scraper. Clean it only with solvent or detergent.

    Normal Bore Size 

    K20Z2:48.0 mm (1.89 in.) 

    K20Z3:51.0 mm (2.01 in.) 

    Fig 1: Identifying Connecting Rod Big End Bore Code Locations
    G06264342Courtesy of AMERICAN HONDA MOTOR CO., INC.
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