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Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 7G50ME-B9.5
MAN Energy Solutions

7G50ME-B9.5

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

Technical data from manufacturer or class sources · not yet verified by a person
21,700 kWPower
7Cylinders
500 mmBore
2,300 mmStroke
127 rpmMCR RPM

The MAN 7G50ME-B9.5 is a low‑speed, 2‑stroke marine main engine delivering 21 700 kW at 127 rpm, featuring camshaft‑driven exhaust valves and electronic fuel injection for high efficiency and Tier III emissions compliance.

Inspection

Inspector Detail ✓ verified

Designation decoded

7 steht für 7 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 7 Zylindern ist die Green-Ultra-Long-Stroke-Variante der 50er-Bohrungsklasse. S/B 4.6 für maximale Effizienz. 7 Zylinder für Handymax- bis Supramax-Leistungsanforderungen.

Calculated metrics

Stroke to bore ratio4.6

Inspector checklist

Laufzeug & Tribologie
  • Zylinderlaufbuchsen: S/B 4.6 — extrem hohe Seitenkräfte, Druckseiten-Verschleiß dominiert
  • Kolbenringe: Maximaler Seitendruck — Ring-Stabilität
  • Alpha-Lubricator: Kalibrierung bei 500 mm Bohrung
Kreuzkopf & Stopfbuchse
  • Kreuzkopflager: Temperatur über 7 Zylinder
  • Stopfbuchse: S/B 4.6 — Drainage überwachen
  • Kolbenstange: Rundlauf
Elektronische Steuerung
  • ME-B Steuerung: Sensoren und EICU
  • Nockenwelle: Kettenlängung
  • Software-Updates
Spülluft & Abgassystem
  • Spülluftkasten: Bei G-Typ Öleintrag-Risiko erhöht
  • Turbolader: Einzelner TC
  • Abgastemperatur über 7 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

  • Beschleunigter Liner-Verschleiß

    Symptoms: Hohe Wear-Rate, Druckseiten-Verschleiß

    Causes: S/B 4.6, Alpha-Lubricator fehlkalibriert

    Preventive: Alpha-Lubricator kalibrieren, Feed-Rate optimieren

  • Elektronik-Ausfall

    Symptoms: Zylinderabschaltung

    Causes: Sensor-Ausfall

    Preventive: Sensor-Kalibrierung

  • Stopfbuchsen-Verschleiß

    Symptoms: Steigende Drainage

    Causes: S/B 4.6 maximale Relativbewegung

    Preventive: Drainage wöchentlich loggen

Expert tips

  • 7×G50ME-B9.5 mit S/B 4.6: Torsionsschwingungen bei 7 Zylindern möglich — ME-B-Steuerung hat Barred Speed Range konfiguriert, Schwingungsdämpfer bei Inspektion kontrollieren
  • LDF (Load-Dependent-Feed) im Alpha-Lubricator: Bei G-Typ besonders wichtig — Seitenkräfte variieren stark mit der Last
  • Bei VLSFO-Betrieb: BN40-Zylinderöl mit reduzierter Feed-Rate, Alpha-Lubricator entsprechend konfigurieren

Related components

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

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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