7S90ME-LGIM9.6
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.
Engine Specifications
Inspector Detail
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Designation decoded
7 = number of cylinders, S = Super Long Stroke, 90 = bore 900 mm, ME = MAN Electronically controlled, LGIM = Liquid Gas Injection Methanol, 9.6 = Mark 9.6 control generation.
Background
The 7S90ME-LGIM is the Super-Long-Stroke variant of the 90 platform with 7 cylinders. 3260 mm stroke (vs. 3720 mm for the G90), higher speed. For very large tankers and bulkers. S/B=3.62 — the lowest ratio in the entire LGIM series, which means lower crosshead side forces but also somewhat lower thermodynamic efficiency.
Calculated metrics
Inspector checklist
- High-pressure pumps: 7 x 900 mm, high delivery quantity
- Injection valves: 900 mm combustion chamber, spray penetration
- Double-wall piping: extensive system
- Changeover: 7 injectors synchronously
- Liners 900 mm: BN 25-40, wear rate, roundness
- Piston rings: thermal variation at 900 mm
- Crosshead: S/B=3.62, the lowest ratio results in the lowest side force in the series
- Stuffing box: 7 drainage lines
- Engine block: 7 x 900 mm, holding-down bolts
- Crankshaft: 7 webs, deflection
- Foundation: deformation
- HPS: 7 FIVA, high load
- Mark 9.6 methanol
- ESD, OMD: 7 cylinders
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature | 290-380 °C | >25 °C spread |
| Methanol injection pressure | 600-700 bar | Pump/filter |
| Cylinder oil consumption | 0.5-0.8 g/kWh | Dosing |
| OMD | <2.5% LEL | Leakage — STOP |
| Deflection | MAN tolerance | Alignment |
Common Failure Modes
Expert tips
- 💡 7S90 with S/B=3.62: the lowest ratio in the entire LGIM series — the crosshead is less loaded than on G variants, but the methanol injection window is shortest at the highest speed.
- 💡 At 900 mm bore, spray penetration remains the central challenge regardless of G or S.
- 💡 Do not neglect structural inspection points at 7 x 900 mm — engine block, foundation, crankshaft.
Related components
Classification & regulatory
IGF Code, LFPF notation. IMO Tier II. Tier III requires SCR/EGR.
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
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