TRUCK SERVICE MANUAL
Field Troubles (Continued)
Probable Cause
Remedy
Trouble
Insufficient fuel supply from fuel
Check fuel rate and reset pump.
pump.
Back pressure on turbocharger
Reduce restriction in exhaust stack.
exhaust too high.
Remove turbocharger and make
Turbocharger rotor rubbing.
necessary repairs or replace with new
turbocharger.
Engine receiving insufficient air due
Remove restriction.
8. Turbocharger speed slightly
to restricted air inlet.
high, exhaust smoking.
Exhaust
temperature high.
Dirty air cleaner.
Clean air cleaner.
Fuel pump delivering too much fuel
Reset fuel pump.
to engine.
Leaking exhaust valves.
Reset or repair bad valves.
High-altitude operation.
Derate engine fbr continuous duty at
9. Turbocharger speed high,
this altitude.
intake manifold pressure correct.
Improper fuel pump setting.
Reset fuel pump.
10. Drooping torque
characteristic.
Remove turbocharger and make
Turbocharger rotor rubbing.
necessary repairs or replace with new
11. Loss of engine power, smoky
turbocharger.
exhaust. Exhaust temperature high.
Dirty compressor wheel.
Clean compressor wheel.
Air intake restricted.
Remove restriction.
Insufficient fuel supply to engine.
Reset fuel pump.
12. Low turbocharger speed, low
power, clean exhaust.
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