SHOP MANUAL MT26-31 - 06.2005
Engine
Tier-3 710655-
Ch 1 page 160
Fuel too hot
Incorrect fuel specifica-
tion
Low charge air pres-
sure
Abnormal pressure
drop in intake piping
Worn engine
Leaky valves
Wrong injection timing
Intake air temperature
too high
Exhaust counterpres-
sure too high
Intake counterpressure
too high
Incorrectly adjusted
injection pump
Blocked fuel consump-
tion gauge
Binding injector
Exhaust brake/white
smoke limiter throttle in
closed position
Check density and vis-
cosity
Check charge air pres-
sure
Check the vacuum before the turbocharger, max.
500 mm wc. Check the air filter
Check “blow-by” in crankcase
Correct value for new engine: 0 - +10 mm wc
(flow rate 60 - 100 l/min.)
Worn crankcase ventilation: -50 - +20 mm wc
Take compression
readings and compare
those of the different
cylinders
Check the temperature
of the air before the
engine.
Above +25 °C reduces
engine power
Take a reading, recom-
mended counterpres-
sure:
500 mm wc,
max. 1000 mm wc
See “Low charge air
pressure”, page 48
Check in a pump test
bench
Injector’s nozzle nut
tightened too hard
Effect Cause Troubleshooting Action
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