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 211).
2. Replace air filter (→ Page 209).
Fuel prefilter clogged.
1. Drain water and contaminants from fuel prefilter (→ Page 196).
2. Replace filter element (→ Page 200).
Easy-change fuel filter clogged.
u
Replace (→ Page 193).
Engine cabling faulty.
u
Injector defective.
u
Replace (→ Page 185).
Engine speed not stable.
Cause
Corrective action
Injector defective.
u
Replace (→ Page 185).
Speed sensor faulty.
u
Check and replace as necessary (→ Instructions for Exchange of
Sub-assemblies).
Engine Control Unit faulty.
1. Check plug connections (→ Page 249).
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 228).
2. Check engine coolant (MTU test kit) (→ Page 236).
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 211).
2. Replace air filter (→ Page 209).
Intercooler clogged.
u
Replace (→ Instructions for Exchange of Sub-assemblies).
Exhaust turbocharger defective.
1. Clean compressor wheel (→ Page 203).
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).
MS150045/03E 2018-08
| Troubleshooting | 129
TIM-ID: 0000044073 - 004
Summary of Contents for 12V4000M73 series
Page 1: ...Operating Instructions Diesel engine 12V4000M73x 16V4000M73x MS150045 03E...
Page 3: ......
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