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MAN Energy Solutions

6S50ME-B9.5

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

Technical data from manufacturer or class sources · not yet verified by a person
22,380 kWPower
6Cylinders
500 mmBore
2,000 mmStroke
127 rpmMCR RPM

The MAN 6S50ME‑B9.5 is a six‑cylinder, low‑speed two‑stroke diesel main engine delivering up to 22 380 kW at 127 rpm, featuring camshaft‑driven exhaust valves and electronic fuel injection for Tier III emissions compliance.

Inspection

Inspector Detail

Designation decoded

6 steht für 6 Zylinder, S für Super-Long-Stroke, 50 für 500 mm Bohrung, ME-B für elektronisch gesteuerte Kraftstoffeinspritzung mit nockenwellengesteuertem Auslassventil, 9.5 für Mark 9.5.

Background

Die S50ME-B9.5 mit 6 Zylindern ist eine der populärsten ME-B-Konfigurationen. S/B 4.0 als bewährter Kompromiss. Weit verbreitet in Handymax-Bulkern, MR-Tankern und mittelgroßen Containerfeedern. 6 Zylinder für ausgewogenes Leistungs- und Schwingungsverhalten.

Calculated metrics

Stroke to bore ratio4

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchsen: S/B 4.0 — signifikante Seitenkräfte, Verschleiß dokumentieren
  • Kolbenringe: Stoßspiel und Höhenverschleiß
  • Alpha-Lubricator: Dosierung und Timing
Kreuzkopf & Stopfbuchse
  • Kreuzkopflager: Temperatur über 6 Zylinder
  • Stopfbuchse: Drainage kontrollieren
  • Kolbenstange: Rundlauf
Elektronische Steuerung
  • ME-B Steuerung: Sensoren und EICU auf Funktion
  • Nockenwelle: Kettenlängung
  • SaCoSone Software
Spülluft & Abgassystem
  • Spülluftkasten: Inspektionsöffnungen
  • Turbolader: Einzelner TC
  • Abgastemperatur über 6 Zylinder

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur nach Zylinder350–420 °C bei MCRSpread >15 °C → Einspritzung prüfen
Spülluftdruck2.3–3.0 barAbfall → TC/Kühler
Pmax±2 bar ZylindergleichgewichtAbweichung → Steuerung
Zylinderöl-Feed-Rate0.5–0.8 g/kWhAlpha-Lubricator kalibrieren
Kühlwasser-Temperatur80–85 °CAbweichung prüfen

Common Failure Modes

  • Kaltverschleiß

    Symptoms: Erhöhte Wear-Rate

    Causes: Kühlwasser unter Taupunkt, Feed-Rate nicht abgestimmt

    Preventive: Kühlwasser >65 °C, Alpha-Lubricator kalibrieren

  • Auslassventil-Verschleiß

    Symptoms: Steigende Abgastemperatur

    Causes: Heißkorrosion, Nockenverschleiß

    Preventive: Ventilsitz prüfen, Nockenprofile kontrollieren

  • Elektronik-Fehler

    Symptoms: Zylinderabschaltung

    Causes: Sensor-Ausfall

    Preventive: Sensor-Kalibrierung

Expert tips

  • 6×S50ME-B9.5 ist eine der meistverbreiteten ME-B-Konfigurationen — breite Erfahrungsbasis und gutes Service-Netz
  • ME-B erlaubt elektronische Optimierung des Einspritztimings — bei Kraftstoffwechsel (HFO→VLSFO) die Einspritzparameter anpassen
  • 6-Zylinder S50 mit S/B 4.0: Ausgewogene Konfiguration ohne besondere Schwingungsprobleme — Standard-Wartungsintervalle gelten

Related components

  • Turbolader (einzelner TC)
  • Alpha-Lubricator
  • EICU
  • Kraftstoff-Aufbereitung
  • Hilfsbläser

Classification & regulatory

IMO Tier II konform. Mit EGR/SCR Tier III. EEDI-optimiert. MARPOL Annex VI — VLSFO.

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

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