ELBOW 4R6450 - Caterpillar

3300 Series EnginesDescription of Change: There are two types of rocker arms used on 3300 Series Engines; cast iron and stamped steel. The cast iron rocker arms are an earlier part, and a replacement bushing is available for parts service of these rocker arms. A replacement bushing is not available for the later stamped steel rocker arms. If a bushing in a stamped steel rocker arm becomes worn too much, a new rocker arm must be installed. The Part Numbers for the cast iron and stamped steel rocker arms are the same, but identification can be made visually.Adaptable To: The 4F443 Bushing is available for replacement of bushings used in the cast iron 5S6854 Inlet Rocker Arm and 5S6855 Exhaust Rocker Arm used on 3300 Series Engines. The 4F443 Bushings are available in packages of four only.