Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 159
Effect Cause Troubleshooting Action
Faulty injector
Low charge air pres-
sure
Adjusted injection
pump
Manner of driving, oper-
ating/load conditions
Check in a pump test
bench that the amount
(Q-mm
3
/stroke) corre-
sponds to specification
High fuel consumption
Low compression
Low engine output
Worn engine
Broken piston rings
Incorrectly adjusted/
defective valves
Hydrostatic lock/bent
connecting rod
Check the compres-
sion
Take compression readings on a hot engine, with all
injectors removed, at starter motor speed
Check cylinders 1 - 6, then cylinder 1 again
Check that starter motor speed does not drop
Correct reading: 20 - 30 bar
Max. 3 bar difference between cylinders
Effect
Troubleshooting
Effect Cause Troubleshooting Action
Low fuel supply pres-
sure (below 0.3 bar)
Faulty injector
Check the feed pump and overflow valve for leakage
as described in the workshop manual
Look for leakage in the suction pipe between tank
and feed pump
Clogged fuel filter/Paraffin precipitation in fuel
Effect Cause Troubleshooting Action
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