The role of the camshaft is to control the opening and closing of the valves to meet the requirements of the engine's working sequence and the changing law of valve opening.
QSB3.9 camshaft is for Cummins QSB Series 4 Cylinder electronic control engines. When you have to replace the camshaft, then you may need to replace the parts below:
Valve Tappets
Push Rods
Rocker Arm Assy
Upper Gasket Kit
Lower Gasket Kit
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