New Product Release! New 4059429 connecting rods for Cummins ISX engines.
Connecting rod 4059429 replaces connecting rod 4923749. This is a drilled connecting rod. Cummins engine company has made a change in their connecting rod design. Many of the ISX engines were built with "non-drilled" connecting rods. These non-drilled Cummins ISX connecting rods have been replaced by drilled connecting rods. For further clarification on connecting rod changes on ISX engines look at Cummins Reference TSB100666. Newer ISX engines (starting with ESN 79614966) were built with fractured rods. Saw cut and fractured rods can be mixed in an engine per Cummins Engine Company TSB120067.