Engine
SHOP MANUAL MT26-31 - 06.2005
Tier-3 710655-
Ch 1 page 147
Black smoke when running/under load
“Adjusted” injection
pump, attempt to boost
Too much fuel in rela-
tion to air at high com-
bustion temperatures
Injection timing too late
Inlet valve does not
open properly. Valve
adjustment disturbed
Broken delivery valve
spring, uncontrolled
injection
Leaky injector, drip-
ping?
Nozzle tip jams
More than 1 washer
under injector
Fault in turbo
Clogged air filter
High exhaust counter-
pressure
Worn intake valves
Clogged intake port
Check the lead seal Test in test bench
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
Check charge air pres-
sure
See page 48
Effect Cause Troubleshooting Action
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