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MTU
20V 4000 M73L
The MTU 20V 4000 M73L is a medium‑speed, 20‑cylinder, four‑stroke diesel engine delivering up to 4 300 kW at 2 100 rpm, primarily used for ship propulsion and high‑power generator sets.
4300.0 kW
Power
Engine Specifications
20
Cylinders
170 mm
Bore
190 mm
Stroke
4,300 kW
MCR Power
2100.0 rpm
MCR RPM
4-stroke
Stroke Type
Family: MTU (Rolls-Royce Power Systems) Series 4000
· Tier: IMO Tier II
· Fuel: MDO, MGO
Other Cylinder Configurations 3
Components & Design
Component data being added…
Technical Data
Bohrung
165-170 mm je Variante
Hub
190-210 mm je Variante
Leistungsbereich
746-4300 kW
Drehzahl
1600-2100 rpm
Zylinder pro Motor
8/12/16/20 cylinders
Hubraum
32-86 Liter je Konfiguration
Bremsleistung M90
2040 kW (12V), 2720 kW (16V)
Bremsleistung M73
1920 kW (12V), 2560 kW (16V), 3200-3600 kW (20V)
Bremsleistung M93
1680 kW (12V), 2240 kW (16V), 2800-3150 kW (20V)
Bremsleistung M63
1840-2080 kW (16V)
Trockengewicht 12V M93
8410 kg
Trockengewicht 16V M93
9600 kg
Trockengewicht 20V M73
12080 kg
Spezifischer Verbrauch M60
185 g/kWh
Spezifischer Verbrauch M63
195-203 g/kWh
Spezifischer Verbrauch M73
213-216 g/kWh
Spezifischer Verbrauch M93
224-230 g/kWh
Einspritzsystem
Common Rail, elektronisch gesteuert
Ventile pro Zylinder
4 valves per cylinder
Turboaufladung
Sequentielle Turboaufladung mit 2 wassergekuehlten Turboladern
Emissionen
IMO Tier II, EPA-konform, M05 mit SCR (IMO III, EPA Tier 4)
Treibstoff
Marinediesel ISO 8217
unified from engine model
True
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Common failures & inspection points
Raw water pump seals: Leaking raw water pumps lead to saltwater corrosion; leaking water can clog the seal bore and enter the bearing oil
Turbocharger failures: Approximately 90% of turbocharger failures are caused by lubrication problems (oil throttling, contaminated oil, incorrect viscosity)
Fuel contamination: Water in fuel, fouling and biological growth damage high-pressure common-rail injection systems (>2,000 bar)
Water-cooled exhaust elbows: Internal corrosion and blockage of flow passages by corrosion products
Cooling system neglect: Fouled heat exchangers, detached sacrificial anodes (zinc), weak impellers lead to overheat events and cavitation
Type-general inspection and maintenance points for this equipment category — not model-specific.
Suppliers & Spare Parts
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Equipment Model #38571
· ✓ still in production