The crankshaft usually consists of the front end of the crankshaft, the main journal, the connecting rod journal, the crank arm, and the rear end of the crankshaft.
QSB3.9 Crankshaft is for Cummins QSB Series 4 Cylinder electronic control engines. When you have to replace the engine crankshaft, then you're supposed to replace the parts below:
Main Bearing Set (Upper Bearing , Lower Bearing & Thrust Bearing)
Connecting Rod Bearing Set (Upper and Lower Bearsings)
Upper Gasket Kit
Lower Gasket Kit
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