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Library› Engine Room› Main Engines (2-Stroke)› Main Engine 2-Stroke› MAN Energy Solutions 7S90ME-LGIM9.6
MAN Energy Solutions

7S90ME-LGIM9.6

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

Technical data from manufacturer or class sources · not yet verified by a person
90,090 kWPower
7Cylinders
900 mmBore
3,260 mmStroke
76 rpmMCR RPM

The MAN 7S90ME-LGIM9.6 is a high‑power, low‑speed two‑stroke main engine delivering up to 90 MW at 76 rpm, featuring dual‑fuel capability (HFO/VLSFO/MDO) and methanol injection for Tier III emissions compliance.

Inspection

Inspector Detail

Designation decoded

7 = 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 7S90ME-LGIM ist die Super-Long-Stroke-Variante der 90er-Plattform mit 7 Zylindern. 3260mm Hub (vs. 3720mm G90), hoehere Drehzahl. Fuer sehr grosse Tanker und Bulker. S/B=3.62 — niedrigstes Verhaeltnis in der gesamten LGIM-Serie, was geringere Kreuzkopf-Seitenkraefte aber auch etwas niedrigeren thermodynamischen Wirkungsgrad bedeutet.

Calculated metrics

Stroke to bore ratio3.62

Inspector checklist

Methanol-Kraftstoffsystem
  • Hochdruckpumpen: 7 x 900mm, hohe Foerdermenge
  • Injektionsventile: 900mm Brennraum, Spray-Penetration
  • Double-Wall-Piping: Umfangreiches System
  • Changeover: 7 Injektoren synchron
Laufzeug und Tribologie
  • Laufbuchsen 900mm: BN 25-40, Wear-Rate, Rundheit
  • Kolbenringe: 900mm thermische Variation
  • Kreuzkopf: S/B=3.62, niedrigstes Verhaeltnis ergibt geringste Seitenkraft der Serie
  • Stopfbuchse: 7 Drainage-Leitungen
Strukturelle Integritaet
  • Motorblock: 7 x 900mm, Ankerschrauben
  • Kurbelwelle: 7 Kroepfungen, Deflection
  • Fundament: Verformung
ME-Steuerung und Sicherheit
  • HPS: 7 FIVA, hohe Last
  • Mark 9.6 Methanol
  • ESD, 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
OMD<2.5% LELLeckage — STOPP
DeflectionMAN-ToleranzFluchtung

Common Failure Modes

  • Spray-Penetration

    Symptoms: Formaldehyd, Pmax niedrig

    Causes: 900mm Brennraum, Duesenverschleiss

    Preventive: Spray-Pattern, strenge Intervalle.

  • Injektor-Verkokung

    Symptoms: Pmax-Spread, Pilot-Verbrauch

    Causes: Pilot-Rueckstaende

    Preventive: Alle 4000-6000 Bh.

  • Stopfbuchsen-Leckage

    Symptoms: OMD, Oelkontamination

    Causes: Dichtringe

    Preventive: Drainage taeglich.

Expert tips

  • 7S90 mit S/B=3.62: Niedrigstes Verhaeltnis der gesamten LGIM-Serie — Kreuzkopf weniger belastet als bei G-Varianten, aber Methanol-Einspritzfenster am kuerzesten bei hoechster Drehzahl.
  • Bei 900mm Bohrung bleibt Spray-Penetration die zentrale Herausforderung unabhaengig von G oder S.
  • Strukturelle Inspektionspunkte bei 7 x 900mm nicht vernachlaessigen — Motorblock, Fundament, Kurbelwelle.

Related components

  • Turbolader
  • Methanol-Bunkertank
  • Pilot-Fuel-System
  • Alpha Lubricator (7)
  • Abhitzekessel
  • Motorblock-Struktur
  • Kurbelwelle

Classification & regulatory

IGF Code, LFPF-Notation. IMO Tier II. 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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