Main Engine 2-Stroke · Main Engines (2-Stroke)
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.
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.
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.
| Parameter | Expected | Deviation means |
|---|---|---|
| Abgastemperatur | 295-385 Grad C | >25 Grad C Spread |
| Methanol-Einspritzdruck | 600-700 bar | Pumpe/Filter |
| Zylindeloelverbrauch | 0.5-0.8 g/kWh | Dosierung |
| Pmax Spread | +/-5 bar | Injektion/Kompression |
| OMD | <2.5% LEL | Leckage — SOFORT stoppen |
| Kurbelwellen-Deflection | MAN-Toleranz | Fluchtung, Fundament |
Symptoms: Formaldehyd, Pmax niedrig, Verbrauch
Causes: 900mm Brennraum, Duesenverschleiss, Druck
Preventive: Strenge Duesen-Intervalle, Spray-Pattern.
Symptoms: Klopfen, LI, Temperatur
Causes: 3720mm Hub, Oelversorgung
Preventive: LI alle 8000 Bh.
Symptoms: Deflection ausser Toleranz
Causes: Thermische Zyklen, Beladung
Preventive: Deflection bei Docking, Chocks.
IGF Code, LFPF-Notation. EEDI Phase 3, CII. Green-Methanol-Zertifizierung fuer CII-Kalkulation. ESP bei Grossmotoren.
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