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MAN Energy Solutions

6L21/31DF-GS-50Hz

MAN Energy Solutions L 21/31 — Viertakt-Marinediesel, Bohrung 210 x Hub 310 mm, 900 / 1000 rpm, 950-1980 kW (GenSets 900/1000 rpm); 1290-1935 kW (Propulsion). Brennstoff: Heavy Fuel Oil (HFO), Marine Gas Oil (MGO), Marine Diesel Oil (MDO), Biofuels, Methanol (DF-M Variante). Status: Active production (Mk2 und DF-M Varianten mit Methanol-Retrofit ab 2025); Legacy Engines im Betrieb - über 290 Millionen Betriebsstunden kumulativ mit L27/38. Verifiziert, Datenblatt verlinkt.

1110.0 kW
Power

Engine Specifications

6
Cylinders
210 mm
Bore
310 mm
Stroke
4-stroke
Stroke Type

Components & Design

Component data being added…

Technical Data

Swept volume per cylinder 10.74 L / 10.7 dm³
Compression ratio 15.5:1
Maximum combustion pressure 200 bar
Specific Fuel Oil Consumption (SFOC) 183-192 g/kWh (genauere Werte: 183 g/kWh bei 85% Last, 180 g/kWh Part-Load optimiert, 189-192 g/kWh je nach Konfiguration)
Specific lubrication oil consumption <0.8 g/kWh
Power per cylinder 220 kW
Stroke/Bore ratio 1.48:1
Turbocharging system MAN TCR constant pressure mit Jet Assist und Interkühlung
Power-to-weight ratio 18.4-22.5 kg/kW
Emission compliance IMO Tier II + IMO Tier III (mit MAN SCR)
power kw 1110
rpm 750
fuel type LNG/HFO (Dual-Fuel)
configuration L
genset kw 1054
genset kva 1318
frequency hz 50

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Common failures & inspection points

Piston ring stiction and breakage due to carbon deposits in grooves - Rings may seize and rupture causing severe liner damage. Residue buildup between ring groo
Cylinder liner scuffing and wear due to inadequate lubrication film - occurs when lubricant breaks down between piston rings and liner, leading to micro-welding
Exhaust valve deposits and carbon buildup - Salt deposits in fuel increase combustion space fouling. L21/31 design includes valve rotators to ensure even temper
Water contamination in fuel system - Four-stroke fuel-injected engines rely entirely on fuel for high-pressure pump lubrication; water kills the fuel pump faste
Turbocharger fouling and excessive play - Turbocharger inspection required for fouling, bearing play exceeding limits, or oil leakage (class-wide issue for all

Type-general inspection and maintenance points for this equipment category — not model-specific.

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Equipment Model #125060 · ✓ still in production