A Series Diesel Engine Base Engine Components 154
Crankshaft and Main Bearings
The crankshaft is a balanced, forged steel unit. Four
cylinder engines have a main bearing.
The lower bearing shells are all the same.
All of the upper bearing shells are all the same.
The two thrust bearings control the end thrust of the
crankshaft.
The upper bearings have two holes in them. The one
side hole receives oil from the main oil rifle.
One of the adjacent holes is aligned with drilling to the
camshaft journal and serves as an orifice for
lubrication flow to the journal and is used for piston
cooling.
The hole does not align perfectly with the cooling
nozzle. The hole is off-set to keep it away from the
highly loaded bearing area.
Note : Oversize service main bearings are available
for reground crankshafts.
Cylinder Block
We have discussed the cylinder block relative to cooling and lubrication in those respective systems. We have also
discussed the interfaces of some of the above power functions with the block. This discussion will cover the
remaining interfaces including the cylinder bores.
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