The crankshaft consists of several cranks, free ends, flywheel ends, and balance weights. QSB4.5 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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