Big End Bore Code Locations

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Numbers or bars have been stamped on the side of each connecting rod as a code for the size of the big end. Use them, and the letters or bars stamped on the crank (codes for rod journal size), to choose the correct bearings. If the codes are indecipherable because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.

Fig 1: Identifying Big End Bore Code

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Bearing Identification Reference Chart

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Connecting Rod Journal Code Locations (Letters or Bars)

Fig 3: Connecting Rod Journal Code

Courtesy of AMERICAN HONDA MOTOR CO., INC.