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6S90ME-LGIM9.6

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

Technical data from manufacturer or class sources · not yet verified by a person
77,220 kWPower
6Cylinders
900 mmBore
3,260 mmStroke
76 rpmMCR RPM

The MAN 6S90ME-LGIM9.6 is a low‑speed, six‑cylinder, two‑stroke main engine delivering up to 77 MW at 76 rpm, featuring dual‑fuel operation with high‑pressure methanol injection and diesel pilot ignition.

Inspection

Inspector Detail

Designation decoded

6 = Zylinderzahl, S = Super Long Stroke, 90 = Bohrung 900 mm, ME = MAN Electronically controlled, LGIM = Liquid Gas Injection Methanol, 9.6 = Mark 9.6 Steuerungsgeneration.

Background

Die S90ME-LGIM ist die Super-Long-Stroke-Variante der 90er-Plattform. Kuerzerer Hub (3260 vs. 3720mm) als die G90, hoehere Drehzahl. Fuer sehr grosse Tanker (VLCCs) und Bulker. Die S90-Plattform ist bewaehrt und wird jetzt als LGIM fuer die Methanol-Transition angeboten.

Calculated metrics

Stroke to bore ratio3.62

Inspector checklist

Methanol-Kraftstoffsystem
  • Hochdruckpumpen 600-700 bar: Grosse Foerdermengen, Redundanz
  • Injektionsventile: 900mm-Brennraum, Spray-Penetration
  • Double-Wall-Piping: Leckage-Detektion
  • Changeover: Vollstaendiger Spuelzyklus
Laufzeug und Tribologie
  • Laufbuchsen 900mm: BN 25-40, Wear-Rate, Bore-Polishing
  • Kolbenringe: Thermische Verformung bei 900mm Durchmesser
  • Kreuzkopf: S/B=3.62, niedrigstes Verhaeltnis in der Serie ergibt geringere Seitenkraefte
  • Stopfbuchse: Drainage-Monitoring
ME-Steuerung
  • HPS: Hohe Volumenstroeme, mehrere Einheiten
  • FIVA: Methanol-Kalibrierung Mark 9.6
  • Zylinderdruckueberwachung: Pmax-Messung
Sicherheit
  • Methanol-Detektoren: Grosser ER
  • ESD: Auto-Diesel-Fallback
  • Fuel-Prep-Room: UV/IR
  • OMD: Alle Zylinder

Logbook reference values

ParameterExpectedDeviation means
Abgastemperatur (Methanol)290-380 Grad C>25 Grad C Spread: Injektor
Methanol-Einspritzdruck600-700 barPumpe/Filter
Zylindeloelverbrauch0.5-0.8 g/kWhDosierung
OMD<2.5% LELLeckage — STOPP
Pmax Spread+/-5 barInjektion/Kompression

Common Failure Modes

  • Injektor-Verkokung

    Symptoms: Pmax-Spread, T_exh ungleich

    Causes: Pilot-Fuel-Rueckstaende, Spuelung unvollstaendig

    Preventive: Alle 4000-6000 Bh pruefen.

  • Spray-Penetration

    Symptoms: Formaldehyd, Pmax niedrig

    Causes: Duesenverschleiss, Druck niedrig

    Preventive: Spray-Pattern dokumentieren.

  • Stopfbuchsen-Leckage

    Symptoms: OMD, Oelkontamination

    Causes: Dichtringe, Verformung

    Preventive: Drainage taeglich, Oel alle 500 Bh.

Expert tips

  • Die S90 mit S/B=3.62 hat das niedrigste Hub-Bohrungs-Verhaeltnis dieser Batch — das bedeutet geringere Kreuzkopf-Belastung, aber auch weniger thermodynamischen Wirkungsgrad bei niedrigen Drehzahlen vs. G90.
  • Bei 900mm Bohrung bleibt die Methanol-Zerstaeubung im grossen Brennraum die zentrale Herausforderung — unabhaengig von G oder S.
  • S90 bei Methanol-Teillast: Hoehere Drehzahl als G90, daher kuerzeres Einspritzfenster — Timing-Kontrolle ueber ECS priorisieren.

Related components

  • Turbolader
  • Methanol-Bunkertank
  • Pilot-Fuel-System
  • Alpha Lubricator
  • Abhitzekessel
  • Leckage-Detektionssystem

Classification & regulatory

IGF Code, LFPF-Notation. IMO Tier II im Methanol-Modus. Tier III erfordert SCR/EGR.

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

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