Usage:
3306B Truck Engines
Description of Change: A new camshaft with harder cam lobes, improved heat treat processing, and a larger diameter between No. 1 and No. 2 bearing journals is used in 3306B Truck Engines. The new camshaft has more resistance to lobe pitting and torsional vibration.
Adaptable To: The new camshaft with all three improvements is effective with 3306B Truck Engine 63Z3300 and 5KD398. It can be installed in earlier 3306B and in 3306 (76R) Truck Engines.
If the new camshaft is 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 new camshaft kit listed in the chart should be used when a new shaft is installed.