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Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 8G45ME-B9.5
MAN Energy Solutions

8G45ME-B9.5

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

Technical data from manufacturer or class sources · not yet verified by a person
18,000 kWPower
8Cylinders
450 mmBore
2,070 mmStroke
129 rpmMCR RPM

The MAN 8G45ME-B9.5 is an 18 MW, low‑speed 2‑stroke diesel main engine featuring a camshaft‑driven exhaust valve and electronic fuel injection, aimed at compact power plants for smaller container and bulk vessels.

Inspection

Inspector Detail

Designation decoded

8 steht für 8 Zylinder, G für Green Ultra-Long-Stroke, 45 für 450 mm Bohrung, ME-B für elektronisch gesteuerte Kraftstoffeinspritzung mit nockenwellengesteuertem Auslassventil, 9.5 für Mark 9.5.

Background

Die G45ME-B9.5 mit 8 Zylindern maximiert die Leistung in der 45er-Bohrungsklasse. S/B 4.6 für niedrigste Drehzahlen. 8 Zylinder bieten ausgezeichnetes Schwingungsverhalten und hohe Leistung für kleine bis mittelgroße Schiffe.

Calculated metrics

Stroke to bore ratio4.6

Inspector checklist

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

    Causes: Maximale Seitenkräfte, Schmierung nicht optimal

    Preventive: Alpha-Lubricator kalibrieren

  • Elektronik-Ausfall

    Symptoms: Zylinderabschaltung

    Causes: Sensor-Ausfall

    Preventive: Sensor-Kalibrierung

  • Stopfbuchsen-Verschleiß

    Symptoms: Steigende Drainage

    Causes: S/B 4.6

    Preventive: Drainage wöchentlich

Expert tips

  • 8-Zylinder bieten das beste Schwingungsverhalten aller Zylinderkonfigurationen — keine Barred Speed Range nötig
  • 8×G45ME-B9.5: Bei kleiner Bohrung und vielen Zylindern die Kraftstoff-Aufbereitung besonders sorgfältig überwachen — kleine Düsenbohrungen sind empfindlich
  • LDF im Alpha-Lubricator bei G-Typ aktivieren und korrekt kalibrieren

Related components

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

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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