MTU 20 V 4000 G23 Technical Publication page 76

Troubleshooting
Exhaust gas black
Component
Air supply
Fuel injection equipment
Engine
Exhaust gas blue
Component
Engine oil
Exhaust turbocharger, cylinder
head, piston rings, cylinder
liner
Exhaust gas white
Component
Engine
Fuel system
Intercooler
M015715/00E 06-08
Probable Cause
Air filter clogged
Injector defective
Overloaded
Probable Cause
Too much oil in engine
Oil separator of crankcase
breather contaminated
Defective
Probable Cause
Not at operating temperature
Water in fuel
Leaking
Task
Check signal ring position of service
indicator (→ Page 125).
Replace (→ Page 106).
Contact Service.
Task
Drain engine oil (→ Page 128).
Replace (→ Page 99).
Contact Service.
Task
Run engine to reach operating temperature.
Check fuel system on fuel prefilter.
Drain fuel prefilter (→ Page 115).
Contact Service.
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