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7G80ME-LGIM9.6

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

Technical data from manufacturer or class sources · not yet verified by a person
62,300 kWPower
7Cylinders
800 mmBore
3,450 mmStroke
78 rpmMCR RPM

The MAN 7G80ME-LGIM9.6 is a 7‑cylinder, low‑speed two‑stroke main engine delivering up to 62 MW at 78 rpm, featuring dual‑fuel operation with high‑pressure methanol injection and diesel pilot ignition for IMO Tier III NOx compliance.

Inspection

Inspector Detail ✓ verified

Designation decoded

7 = Zylinderzahl, G = Green Ultra Long Stroke, 80 = Bohrung 800 mm, ME = MAN Electronically controlled, LGIM = Liquid Gas Injection Methanol, 9.6 = Mark 9.6 Steuerungsgeneration.

Background

Die 7G80ME-LGIM ist fuer die groessten VLCCs und Containerschiffe (>15.000 TEU) mit Methanol-Antrieb konzipiert. 7 Zylinder bei 800mm Bohrung und 3450mm Hub liefern enorme Leistung. Die 7-Zylinder-Version bietet ca. 17% mehr Leistung als die 6-Zylinder-Variante bei gleichem S/B-Verhaeltnis.

Calculated metrics

Stroke to bore ratio4.31

Inspector checklist

Methanol-Kraftstoffsystem
  • Hochdruckpumpen: 7 x 800mm = sehr hohe Foerdermenge, Pumpenredundanz
  • Injektionsventile: 800mm-Brennraum, Spray-Penetration fuer alle 7 Zyl.
  • Double-Wall-Piping: Umfangreichstes System, viele Flansche
  • Bunkervolumen: Grosser Methanol-Verbrauch
Laufzeug und Tribologie
  • Laufbuchsen 800mm: BN 25-40, Bore-Polishing, Roundness
  • Kolbenringe: Extreme thermische Verformung 800mm Durchmesser
  • Kreuzkopf: S/B=4.31, 3450mm Hub, hohe Seitenkraefte, 7 LI-Aufnahmen
  • Stopfbuchse: 7 Drainage-Leitungen, langer Hub
Strukturelle Integritaet
  • Motorblock: 7 x 800mm, extreme Kraefte, Ankerschrauben
  • Kurbelwelle: Deflection bei Docking, 7 Kroepfungen
  • Fundament: Thermische Verformung
ME-Steuerung und Sicherheit
  • HPS: Maximale Hydraulik-Last fuer 7 Zylinder
  • FIVA: 7 x Methanol-Maps Mark 9.6
  • ESD, Detektoren, OMD: 7 Zylinder

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur290-380 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
Kurbelwellen-DeflectionLaut MAN-ToleranzFluchtung/Fundament

Common Failure Modes

  • Spray-Penetration unzureichend

    Symptoms: Formaldehyd, Pmax niedrig

    Causes: Duesenverschleiss, Druck niedrig

    Preventive: Spray-Pattern dokumentieren, strenge Intervalle.

  • Kreuzkopf-Lagerschaden

    Symptoms: Klopfen, LI, Temperatur

    Causes: 3450mm Hub, Oelversorgung

    Preventive: LI alle 8000 Bh.

  • Ankerschrauben

    Symptoms: Vibration, Risse

    Causes: Thermische Zyklen, Vorspannung

    Preventive: Ultraschall bei Docking.

Expert tips

  • 7G80 mit Methanol: Einer der leistungsstaerksten Dual-Fuel-Motoren — jede Inspektion ist wertvolles Pionierwissen, systematisch dokumentieren.
  • Bei 7 x 800mm: Ersatzteillogistik beachten — 7 Saetze aller Verschleissteile an Bord, Methanol-Injektoren als kritische Spares.
  • Abhitzekessel-Leistung bei Methanol 10-15% reduziert — bei 7-Zyl. ist die absolute Leistung groesser, Dampfversorgung dennoch pruefen.

Related components

  • Turbolader (Surge-Ueberwachung)
  • Methanol-Bunkertank (grosses Volumen)
  • Pilot-Fuel-System (Redundanz)
  • Alpha Lubricator (7)
  • Abhitzekessel
  • SCR/EGR
  • Motorblock-Struktur

Classification & regulatory

IGF Code, LFPF-Notation. EEDI Phase 3, CII. Bei VLCC: CAS beachten.

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

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