Connecting Rod Big End Bore Code Locations

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 Connecting Rod Big End Bore Code

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Identifying Connecting Rod Journal Code Chart

Courtesy of AMERICAN HONDA MOTOR CO., INC.