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Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 8S50ME-B9.5
MAN Energy Solutions

8S50ME-B9.5

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

Technical data from manufacturer or class sources · not yet verified by a person
29,840 kWPower
8Cylinders
500 mmBore
2,000 mmStroke
127 rpmMCR RPM

The MAN 8S50ME-B9.5 is a low‑speed, 2‑stroke main propulsion engine delivering 29,840 kW at 127 rpm, featuring a camshaft‑driven exhaust valve and electronic fuel injection for improved efficiency and reduced part count.

Inspection

Inspector Detail ✓ verified

Designation decoded

8 steht für 8 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 8 Zylindern ist eine der meistverbreiteten ME-B-Konfigurationen. S/B 4.0 als bewährter Standard. Weit verbreitet in Supramax-Bulkern und MR-Tankern. 8 Zylinder für maximale Leistung bei exzellentem Schwingungsverhalten.

Calculated metrics

Stroke to bore ratio4

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchsen: S/B 4.0 — signifikante Seitenkräfte
  • Kolbenringe: Stoßspiel und Höhenverschleiß
  • Alpha-Lubricator: Dosierung
Kreuzkopf & Stopfbuchse
  • Kreuzkopflager: Temperatur über 8 Zylinder
  • Stopfbuchse: Drainage
  • Kolbenstange: Deflection
Elektronische Steuerung
  • ME-B: Sensoren, EICU
  • Nockenwelle: Kettenlängung
  • Software
Spülluft & Abgassystem
  • Spülluftkasten: Inspektionsöffnungen
  • Turbolader: 1-2 TC
  • Abgastemperatur über 8 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

Common Failure Modes

  • Kaltverschleiß

    Symptoms: Erhöhte Wear-Rate

    Causes: Kühlwasser unter Taupunkt, Feed-Rate

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

  • Auslassventil-Verschleiß

    Symptoms: Steigende Abgastemperatur

    Causes: Heißkorrosion, Nockenverschleiß

    Preventive: Ventilsitz prüfen

  • Elektronik-Fehler

    Symptoms: Zylinderabschaltung

    Causes: Sensor

    Preventive: Kalibrierung

Expert tips

  • 8×S50ME-B9.5 ist eine der meistverbreiteten ME-B-Konfigurationen — breite Erfahrungsbasis, alle Service Letters und Best Practices gut dokumentiert
  • 8 Zylinder S50 mit S/B 4.0: Ausgewogene Konfiguration ohne besondere Herausforderungen — Standard-ME-B-Wartung gilt
  • ME-B mit elektronischer Einspritzung: 3-5% Kraftstoff-Einsparung gegenüber MC möglich — sicherstellen, dass die Optimierung genutzt wird

Related components

  • Turbolader (1-2 TC)
  • Alpha-Lubricator
  • EICU
  • Kraftstoff-Aufbereitung
  • Hilfsbläser

Classification & regulatory

IMO Tier II. Mit EGR/SCR Tier III. EEDI. 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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