Engine Vibration
"Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point."
Causes:
1.
Foundation condition
The foundation bolts on driving end and free end are the
most vulnerable. Schedule checking and tightening sequence with specified load
required. Also check for cracks on the foundation and the leveling screw and
shims condition.
2.
Crankshaft alignment
Crankshaft alignment is very much important for engine stability.
Crankshaft deflection is indicate the alignment between the crankshaft bearings
and the bearing of the driving shaft. Following are the possible causes –uneven
wear of crankshaft bearings, change in the position of driven shaft or change
in the engine seating on the foundation.
Read about crankshaft deflection measurement
3.
Vibration damper
The function of vibration damper is to absorb torsional
vibration. Sleeve spring pack used to absorb vibration. If the spring pack broken
of wear down then vibration occurs.
4.
Looses or broken parts
This is a common cause of engine vibration. To prevent
vibration due to loosen or broken parts schedule nut-bolt tighten checking necessary.
Specially check the Turbocharger foundation nut-bolts.
5.
Exhaust gas back pressure
If exhaust manifold or boiler (in case of EGB) clogged with
carbon deposit or some broken part then due to back pressure engine vibration
can occurs.
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