SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 154
Vibration, no driven components engaged
Effect Cause Troubleshooting Action
Wrong injection timing
Broken delivery valve
spring
Disconnect one delivery pipe at a time and listen for
changes in the engine sound.
WARNING!
Be careful when disconnecting the delivery
pipes as the pressure is extremely high and
could cause injury
Individual injectors not
operating
Fan imbalance
Flywheel has come
loose
Crankshaft hub loos-
ened
Abnormally worn main
bearings
Vibration or unusual
noise at 1500 - 1700
r/min
Drive belts run off pul-
leys
Defective vibration
damper
Only when compressed
air compressor is
charging, worst at
about 1000 r/min, see
also page xx
Compressor operates
with excessive counter-
pressure (e.g. clogged
piping/air dryer) or
excessively high safety
valve opening pressure
Alignment fault
Check engine align-
ment
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