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7G90ME-LGIM9.6

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

Technical data from manufacturer or class sources · not yet verified by a person
78,400 kWPower
7Cylinders
900 mmBore
3,720 mmStroke
76 rpmMCR RPM

The MAN 7G90ME-LGIM9.6 is a low‑speed, 2‑stroke main engine delivering up to 78 400 kW at 76 rpm, featuring dual‑fuel capability with methanol injection (≈600 bar) and conventional diesel pilot ignition.

Inspection

Inspector Detail

Designation decoded

7 = Zylinderzahl, G = Green Ultra Long Stroke, 90 = Bohrung 900 mm, ME = MAN Electronically controlled, LGIM = Liquid Gas Injection Methanol, 9.6 = Mark 9.6 Steuerungsgeneration.

Background

Die 7G90ME-LGIM ist einer der leistungsstaerksten Methanol-Motoren ueberhaupt. 7 Zylinder bei 900mm Bohrung und 3720mm Hub liefern enorme Leistung fuer die groessten Containerschiffe (>20.000 TEU) und ULCCs. Nur wenige Werften koennen Motoren dieser Groesse bauen — HHI, DSME, SWS, CSSC.

Calculated metrics

Stroke to bore ratio4.13

Inspector checklist

Methanol-Kraftstoffsystem
  • Hochdruckpumpen: 7 x 900mm = maximale Foerdermenge, mehrere Pumpeneinheiten
  • Injektionsventile: 900mm-Brennraum, Spray-Penetration extremste Anforderung
  • Double-Wall-Piping: Laengste Leitungen, meiste Flansche
  • Methanol-Bunker: Enormes Volumen, Tank-Management
Laufzeug und Tribologie
  • Laufbuchsen 900mm: Extreme Dimension, BN 25-40, Rundheit
  • Kolbenringe: 900mm Durchmesser, thermische Variation
  • Kreuzkopf: 3720mm Hub, S/B=4.13, extreme Belastung, 7 LI-Aufnahmen
  • Stopfbuchse: Laengste Kolbenstange, 7 Drainage-Leitungen
Strukturelle Integritaet
  • Motorblock: 7 x 900mm, Ankerschrauben ultraschallgeprueft
  • Kurbelwelle: Deflection, 7 Kroepfungen, groesste Dimensionen
  • Fundament: Thermische Zyklen Methanol/Diesel
ME-Steuerung und Sicherheit
  • HPS: Maximale Systemanforderung, 7 FIVA
  • Mark 9.6 Methanol-Kalibrierung
  • ESD, Detektoren, OMD: 7 Zylinder, volle Abdeckung

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur295-385 Grad C>25 Grad C Spread
Methanol-Einspritzdruck600-700 barPumpe/Filter
Zylindeloelverbrauch0.5-0.8 g/kWhDosierung
Pmax Spread+/-5 barInjektion/Kompression
OMD<2.5% LELLeckage — SOFORT stoppen
Kurbelwellen-DeflectionMAN-ToleranzFluchtung, Fundament

Common Failure Modes

  • Spray-Penetration unzureichend

    Symptoms: Formaldehyd, Pmax niedrig, Verbrauch

    Causes: 900mm Brennraum, Duesenverschleiss, Druck

    Preventive: Strenge Duesen-Intervalle, Spray-Pattern.

  • Kreuzkopf-Schaden

    Symptoms: Klopfen, LI, Temperatur

    Causes: 3720mm Hub, Oelversorgung

    Preventive: LI alle 8000 Bh.

  • Fundament-Verformung

    Symptoms: Deflection ausser Toleranz

    Causes: Thermische Zyklen, Beladung

    Preventive: Deflection bei Docking, Chocks.

Expert tips

  • 7G90 mit Methanol: Absolutes Spitzensegment — jede Inspektion generiert Pionier-Erfahrung, sorgfaeltig dokumentieren und mit Klasse teilen.
  • Bei diesen Dimensionen: Strukturelle Integritaet ist mindestens so wichtig wie die Methanol-Spezifika.
  • Methanol-Teillast unter 30% MCR: Pilot-Anteil wird so hoch, dass CO2-Vorteil fast verschwindet — Route und Beladung optimieren.

Related components

  • Turbolader (groesste Einheiten, ggf. 2 parallel)
  • Methanol-Bunkertank (enormes Volumen)
  • Pilot-Fuel-System (hoechste Redundanz)
  • Alpha Lubricator (7)
  • Abhitzekessel
  • SCR/EGR (Tier III)
  • Motorblock, Kurbelwelle, Fundament

Classification & regulatory

IGF Code, LFPF-Notation. EEDI Phase 3, CII. Green-Methanol-Zertifizierung fuer CII-Kalkulation. ESP bei Grossmotoren.

Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.

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