7G90ME-LGIM9.6
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.
Engine Specifications
Inspector Detail
▸
Designation decoded
7 = number of cylinders, G = Green Ultra Long Stroke, 90 = bore 900 mm, ME = MAN Electronically controlled, LGIM = Liquid Gas Injection Methanol, 9.6 = Mark 9.6 control generation.
Background
The 7G90ME-LGIM is one of the most powerful methanol engines of all. 7 cylinders at 900 mm bore and 3720 mm stroke deliver enormous power for the largest container ships (>20,000 TEU) and ULCCs. Only a few shipyards can build engines of this size — HHI, DSME, SWS, CSSC.
Calculated metrics
Inspector checklist
- High-pressure pumps: 7 x 900 mm = maximum delivery quantity, multiple pump units
- Injection valves: 900 mm combustion chamber, spray penetration the most extreme requirement
- Double-wall piping: longest lines, most flanges
- Methanol bunker: enormous volume, tank management
- Liners 900 mm: extreme dimension, BN 25-40, roundness
- Piston rings: 900 mm diameter, thermal variation
- Crosshead: 3720 mm stroke, S/B=4.13, extreme loading, 7 LI shell impressions
- Stuffing box: longest piston rod, 7 drainage lines
- Engine block: 7 x 900 mm, holding-down bolts ultrasonically checked
- Crankshaft: deflection, 7 webs, largest dimensions
- Foundation: thermal cycles methanol/diesel
- HPS: maximum system demand, 7 FIVA
- Mark 9.6 methanol calibration
- ESD, detectors, OMD: 7 cylinders, full coverage
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature | 295-385 °C | >25 °C spread |
| Methanol injection pressure | 600-700 bar | Pump/filter |
| Cylinder oil consumption | 0.5-0.8 g/kWh | Dosing |
| Pmax spread | ±5 bar | Injection/compression |
| OMD | <2.5% LEL | Leakage — STOP IMMEDIATELY |
| Crankshaft deflection | MAN tolerance | Alignment, foundation |
Common Failure Modes
Expert tips
- 💡 The 7G90 with methanol: the absolute top segment — every inspection generates pioneering experience, document it carefully and share it with the class society.
- 💡 At these dimensions: structural integrity is at least as important as the methanol specifics.
- 💡 Methanol part load below 30% MCR: the pilot fraction becomes so high that the CO2 advantage nearly disappears — optimize route and loading.
Related components
Classification & regulatory
IGF Code, LFPF notation. EEDI Phase 3, CII. Green-methanol certification for the CII calculation. ESP applies to large engines.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 47
Components & Design
Component data being added…
Technical Data
🤖 Ask about this model
One free question — answered like a marine engineer. No account needed.
Suppliers & Spare Parts
Direct links to manufacturer, datasheet, spare-parts portal and dealers — request access below.
📄 Request sourcing links & documentsCases, daily reports, timesheets and AI troubleshooting in the OceanSphere Marine app — free for 14 days.
Start free trial →Find manufacturers, repair shops and spare-part dealers in the Maritime Network — our global company directory.
Maritime Network →