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MAN Energy Solutions

6S46ME-B9.5

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

Technical data from manufacturer or class sources · not yet verified by a person
18,600 kWPower
6Cylinders
460 mmBore
1,932 mmStroke
129 rpmMCR RPM

The MAN 6S46ME‑B9.5 is a medium‑speed, six‑cylinder, two‑stroke main engine delivering up to 18 600 kW at 129 rpm, designed for compact installation on small‑to‑mid size container, bulk and product tanker vessels.

Inspection

Inspector Detail ✓ verified

Designation decoded

6 steht für 6 Zylinder, S für Super-Long-Stroke, 46 für 460 mm Bohrung, ME-B für elektronisch gesteuerte Kraftstoffeinspritzung mit nockenwellengesteuertem Auslassventil, 9.5 für Mark 9.5.

Background

Die S46ME-B9.5 mit 6 Zylindern ist die Super-Long-Stroke-Variante der 46er-Bohrungsklasse. S/B 4.2 für niedrige Drehzahlen. ME-B-Technologie. Typisch für Handysize/Supramax-Bulker. 6 Zylinder als populäre Konfiguration mit gutem Schwingungsverhalten.

Calculated metrics

Stroke to bore ratio4.2

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchsen: S/B 4.2 — hohe Seitenkräfte, Druckseiten-Verschleiß
  • Kolbenringe: Stoßspiel und Ring-Stabilität
  • 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
  • Nockenwelle: Kettenlängung
  • Software-Stand
Spülluft & Abgassystem
  • Spülluftkasten: Inspektionsöffnungen
  • Turbolader: Einzelner TC — Reinigung
  • Abgastemperatur über 6 Zylinder

Logbook reference values

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

Common Failure Modes

  • Kaltverschleiß

    Symptoms: Erhöhte Wear-Rate, raue Oberfläche

    Causes: Kühlwasser unter Taupunkt, Feed-Rate nicht abgestimmt

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

  • Elektronik-Fehler

    Symptoms: Zylinderabschaltung

    Causes: Sensor-Ausfall, EICU

    Preventive: Sensor-Kalibrierung

  • Düsenverschleiß

    Symptoms: Ungleichmäßige Verbrennung

    Causes: Kraftstoff-Qualität, Betriebsstunden

    Preventive: Düsen regelmäßig prüfen und tauschen

Expert tips

  • S46ME-B9.5 mit 6 Zylindern ist eine populäre Konfiguration für Supramax-Bulker — gute Ersatzteil-Verfügbarkeit und Service-Netz
  • ME-B erlaubt Variable-Injection-Timing (VIT) elektronisch — bei Teillast die Einspritzprofile auf Effizienz optimieren
  • 6-Zylinder-S46: Gutes Schwingungsverhalten, keine kritischen Barred Speed Ranges — dennoch Schwingungsdämpfer kontrollieren

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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