MTU 20V4000M93 series, Operating Instructions Manual

Page: 100 / 275

Engine does not reach rated speed.
Cause Corrective action
Engine: Overload.
u
Reduce load.
Air filter clogged. 1. Check signal ring position of service indicator (→ Page 181).
2. Replace air filter (→ Page 179).
Fuel prefilter clogged. 1. Drain water and contaminants from fuel prefilter (→ Page 166).
2. Replace filter element (→ Page 170).
Easy-change fuel filter clogged.
u
Replace (→ Page 163).
Engine cabling faulty.
u
Check (→ Page 244).
Injector defective.
u
Replace (→ Page 155).
Engine speed not stable.
Cause Corrective action
Injector defective. u Replace (→ Page 155).
Speed sensor faulty. u Check and replace as necessary (→ Instructions for Exchange of
Sub-assemblies).
Engine Control Unit faulty. 1. Check plug connections (→ Page 251).
2. Replace Engine Control Unit (→ Page 252).
3. Contact Service.
Charge-air temperature too high.
Cause Corrective action
Engine: Overload.
u
Reduce load.
Air inlet temperature too high.
u
Check fans and air supply/ventilation ducts for engine room.
Incorrect engine coolant
concentration. 1. Check engine coolant level (→ Page 225).
2. Check engine coolant (MTU test kit) (→ Page 234).
Intercooler clogged. u Replace (→ Instructions for Exchange of Sub-assemblies).
Charge-air pressure too low.
Cause Corrective action
Air filter clogged. 1. Check signal ring position of service indicator (→ Page 181).
2. Replace air filter (→ Page 179).
Intercooler clogged. u Replace (→ Instructions for Exchange of Sub-assemblies).
Exhaust turbocharger defective. 1. Clean compressor wheel (→ Page 173).
2. Replace exhaust turbocharger (→ Instructions for Exchange of Sub-
assemblies).
Engine coolant escapes at intercooler.
Cause Corrective action
Intercooler leaky, major coolant
discharge.
u
Replace intercooler (→ Instructions for Exchange of Sub-
assemblies).
98 | Troubleshooting | MS150048/05E 2018-03
TIM-ID: 0000044073 - 004