POWER
BALANCING OF ENGINE
for economy and efficient running of an engine
equal power should be produced from each cylinder this is then said to be a owe
balanced and it may be necessary to make some minor adjustment to achieve this
1.
power produced is related to the quantity of fuel injected and balancing is
carried out by small adjustment to individual fuel pump controls
2 .adjustments
are limited to ensure units are not overloaded ,exhaust temperature are not
excessive and that pump controls still cut off when brought to stop
3. fuel
pump rack positions and exhaust and cooling outlet temperatures from each
cylinder should be noted
4. equal exhaust
temperatures on their own do not necessary show on accurate balance
5. power balance can be checked by measurement
from indicator diagrams by calculating the area of mean high from each cylinder
6. if an engine
operates in an unbalanced condition some bearings and running gear may be
become overloaded this may cause overloading and bearing failure
7. overload in
cylinder may cause piston blow past with the corresponding dangers of
overheated or seized piston
8.unbalance will
also set up vibrations which if maintained for prolonged periods will cause fatigue
from the fluctuating stress induced this may in turn lead to fatigue cracking of metal in bearings fracture in studs or bolts, cracks on
crankshaft and bed plates,and slackening or failure of holding down bolts
9.for proper
balance engine running condition should be normal by observation of the
relevant temperatures and pressures particularly exhaust and cooling outlet
temperature lubricating oil and boost air pressure, the exhaust should be clear
of smoke and there should be no unusual noise or vibration
