The crankshaft changes the combustion forces in the cylinder into usable rotating torque which powers the equipment. A vibration damper is used at the front of the crankshaft to reduce torsional vibrations (twist on the crankshaft) that can cause damage to the engine.
The crankshaft drives a group of gears on the front of the engine. The gear group drives the oil pump, camshaft, hydraulic oil pump, and the gear driven air compressor and/or power steering pump. In addition to this, the front belt pulleys on the crankshaft drive the radiator fan, water pump, alternator and freon compressor.
Hydrodynamic seals are used at both ends of the crankshaft to control oil leakage. The hydrodynamic grooves in the seal lip move lubrication oil back into the crankcase as the crankshaft turns. The front seal is located in the front housing. The rear seal is installed in the flywheel housing.
Schematic Of Oil Passages In Crankshaft
Pressure oil is supplied to all main bearings through drilled holes in the webs of the cylinder block. The oil then flows through drilled holes in the crankshaft to provide oil to the connecting rod bearings. The crankshaft is held in place by seven main bearings. A thrust main bearing next to the rear main bearing controls the end play of the crankshaft.