BOLT 1470266 - Caterpillar

3300 Family Of EnginesDescription of Change: New camshafts with harder cam lobes, improved heat treat processing, and a larger diameter between No. 1 and No. 2 bearing journals are used in the 3300 Family Of Engines. The new camshafts have more resistance to lobe pitting and torsional vibration.Adaptable To: The new camshafts with all three improvements are effective as follows: 3306B Vehicular Engine-8Z32529, 13Z117603306B Industrial Engine-64Z4626, 7JB18473306B Marine Engine-84Z8933306B Generator Set Engine-85Z2637, 5JC6453306B Truck Engine-63Z3300, 5KD3983304B Vehicular Engine-7Z16281, 12Z156833304B Industrial Engine-10E1710, 4XB3623304B Marine Engine-13E7423304B Generator Set Engine 83Z3131, 3TC884The improved camshafts can be installed in all earlier engines in the 3300 Family. If the new camshafts are installed, use a complete set of new lifters and coat the shaft lobes with the special cam lubricant. Used lifters probably will not have the same service life as the new camshaft, resulting in additional repairs and downtime. For this reason, the applicable camshaft kit listed in the chart should be used when a new shaft is installed.