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Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 7S50ME-C9.6
MAN Energy Solutions

7S50ME-C9.6

Main Engine 2-Stroke · Main Engines (2-Stroke)

Technical data from manufacturer or class sources · not yet verified by a person
26,110 kWPower
7Cylinders
500 mmBore
2,000 mmStroke
127 rpmMCR RPM

The MAN 7S50ME-C9.6 is a low‑speed, 7‑cylinder, two‑stroke main engine delivering 26 110 kW at 127 rpm, featuring hydraulic valve actuation and advanced electronic control for high efficiency and Tier III emissions compliance.

Inspection

Inspector Detail

Designation decoded

7 = Zylinderzahl, S = Super-Long-Stroke, 50 = Bohrung 500 mm, ME = elektronisch gesteuert, C = Compact, 9.6 = Engine Mark.

Background

Die 7S50ME-C mit 2000 mm Hub (Ratio 4.0) und 7 Zylindern. Super-Long-Stroke-Variante für höhere Drehzahlen. Beliebte Konfiguration für Short-Sea und Küstenfahrt mit guter Laufruhe.

Calculated metrics

Stroke to bore ratio4

Inspector checklist

Brennstoffsystem
  • Injektoren: Cat-Fines, 7 Stück
  • Fuel-System
  • ME Timing
Laufzeug & Tribologie
  • Ratio 4.0: Moderate Seitenkräfte
  • Laufbuchsen: Verschleiß, Cold Corrosion
  • Zylinderöl: BN
Steuerung & Hydraulik
  • 7 HCUs: 200-300 bar
  • EICU
  • Hydrauliköl
Abgassystem
  • TC (1-2x)
  • Abgaskessel
  • Spülluft-Receiver
Dichtungen
  • 7 Stopfbuchsen
  • Abgasventile
  • Spülluft-Klappen

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur nach Zylinder345-415 °C>25 °C → Einspritzung
P-max±5 barTiming
Spülluftdruck2.0-3.0 barTC
Zylinderöl-Feed-Rate0.8-1.2 g/kWhFuel-abhängig
Hydrauliköl-Druck200-300 barHCU

Common Failure Modes

  • Cat-Fine-Schäden

    Symptoms: Verschleiß

    Causes: Cat-Fines

    Preventive: Separator

  • Cold Corrosion

    Symptoms: Liner-Verschleiß

    Causes: BN niedrig

    Preventive: BN anpassen

  • TC-Surging bei Teillast

    Symptoms: Pumpgeräusche

    Causes: S50 höhere Drehzahl, häufige Lastwechsel

    Preventive: TC-Bypass bei <35% Last

Expert tips

  • 7S50 auf Short-Sea: Häufige Lastwechsel durch Hafenmanöver. EICU-Tuning auf Teillast prüfen.
  • 7 Zylinder S50: Sehr gutmütiges Schwingungsverhalten bei moderaten Seitenkräften — problemloser Motor.
  • VLSFO-Kompatibilität bei jedem Bunker prüfen — Short-Sea-Schiffe bunkern häufig bei verschiedenen Lieferanten.

Related components

  • Turbolader (1-2x)
  • Separator
  • Alpha Lubricator
  • Fuel-System
  • TC-Bypass

Classification & regulatory

IMO Tier II. Tier III in ECA. MARPOL Annex VI. EU ETS für EU-Fahrten.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.

Documentation

Manuals

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