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4B3.9
The crankshaft has sufficient strength and rigidity, and the surface of the journal needs to be wear-resistant, work uniformly, and have good balance.
4B3.9 Crankshaft is for Cummins B Series 4 Cylinder mechanical engines. When you have to replace the engine crankshaft, then you will have 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
