A Series Diesel Engine Base Engine Components 165
A rod knock occurs when the engine is not loaded.
Verify by first applying load and then unloading and
listening for the knock.
Crankshaft and Main Bearings
Improper maintenance of the lubrication system is also
the primary cause of reduced main bearing life.
A malfunction of the crankshaft/main bearing will
usually be detected by reduced oil pressure. As with
rod bearings, continued operation with low oil pressure
will lead to a rapid deterioration of the bearings and
eventually will produce a knocking sound.
A main bearing will be heard when the engine is
loaded.
A damaged or worn thrust bearing flange of the upper
main bearing shell can be detected by measuring the
end play of the crankshaft .
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