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Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 8G50ME-B9.5
MAN Energy Solutions

8G50ME-B9.5

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

Technical data from manufacturer or class sources · not yet verified by a person
24,800 kWPower
8Cylinders
500 mmBore
2,300 mmStroke
127 rpmMCR RPM

The MAN 8G50ME-B9.5 is an eight‑cylinder, low‑speed 2‑stroke diesel main engine delivering 24 800 kW at 127 rpm, featuring camshaft‑driven exhaust valves and electronic fuel injection for Tier III NOx compliance.

Inspection

Inspector Detail ✓ verified

Designation decoded

8 steht für 8 Zylinder, G für Green Ultra-Long-Stroke, 50 für 500 mm Bohrung, ME-B für elektronisch gesteuerte Kraftstoffeinspritzung mit nockenwellengesteuertem Auslassventil, 9.5 für Mark 9.5.

Background

Die G50ME-B9.5 mit 8 Zylindern maximiert die Leistung in der 50er-Bohrungsklasse bei gleichzeitig bestem Schwingungsverhalten. S/B 4.6 für maximale Effizienz. Einsatz in Supramax- bis Panamax-Schiffen.

Calculated metrics

Stroke to bore ratio4.6

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchsen: S/B 4.6 — extrem hohe Seitenkräfte
  • Kolbenringe: Ring-Stabilität bei maximalem Seitendruck
  • Alpha-Lubricator: Kalibrierung
Kreuzkopf & Stopfbuchse
  • Kreuzkopflager: Temperatur über 8 Zylinder
  • Stopfbuchse: S/B 4.6 Drainage
  • Kolbenstange: Rundlauf
Elektronische Steuerung
  • ME-B: Sensoren, EICU
  • Nockenwelle: Kettenlängung
  • Software
Spülluft & Abgassystem
  • Spülluftkasten: G-Typ Öleintrag-Risiko
  • Turbolader: 1-2 TC
  • Abgastemperatur über 8 Zylinder

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur nach Zylinder350–420 °C bei MCRSpread >15 °C → Einspritzung prüfen
Spülluftdruck2.5–3.2 barAbfall → TC/Kühler
Pmax±2 bar ZylindergleichgewichtAbweichung → Steuerung
Zylinderöl-Feed-Rate0.5–0.8 g/kWhAlpha-Lubricator kalibrieren

Common Failure Modes

  • Liner-Verschleiß durch S/B 4.6

    Symptoms: Hohe Wear-Rate, Druckseiten-Verschleiß

    Causes: Maximale Seitenkräfte, Schmierung

    Preventive: Alpha-Lubricator kalibrieren

  • Elektronik-Ausfall

    Symptoms: Zylinderabschaltung

    Causes: Sensor

    Preventive: Kalibrierung

  • Stopfbuchsen-Verschleiß

    Symptoms: Steigende Drainage

    Causes: S/B 4.6

    Preventive: Drainage wöchentlich

Expert tips

  • 8×G50ME-B9.5: Bestes Schwingungsverhalten aller Zylinderkonfigurationen, keine Barred Speed Range
  • LDF im Alpha-Lubricator bei G-Typ ist essentiell — bei Volllast höhere Feed-Rate als bei Teillast
  • 8 Zylinder bei 500 mm Bohrung: Kolbenziehung an Bord möglich — effiziente Wartungsplanung in 2er-Gruppen

Related components

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

Classification & regulatory

IMO Tier II. 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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