8S40ME-LGIM9.6
The MAN 8S40ME-LGIM9.6 is an 8‑cylinder, low‑speed 2‑stroke main engine delivering 12.56 MW at 146 rpm, designed for Tier III emissions and capable of running on HFO, VLSFO, MDO or methanol via high‑pressure injection.
Engine Specifications
Inspector Detail
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Designation decoded
8 cylinders, Super-Long-Stroke, 400 mm bore, ME (electronically controlled), LGIM (Liquid Gas Injection Methanol), Mark 9.6 – dual-fuel methanol + pilot-diesel two-stroke engine
Background
The 8S40ME-LGIM9.6 is a compact methanol dual-fuel engine with a 400 mm bore in Super-Long-Stroke design. The 8-cylinder configuration offers the best vibration behaviour. With an S/B ratio of 4.0, typical for the S series. Methanol injection at 600-700 bar, pilot diesel 3-8%. The small size allows maintenance without a dry dock; components can be handled with onboard equipment. Methanol has only about half the energy content of HFO, so greater tank capacity is required.
Calculated metrics
Inspector checklist
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature, methanol operation | ||
| Exhaust temperature, diesel operation | ||
| Methanol injection pressure | ||
| Pilot diesel oil fraction | ||
| Pmax deviation between cylinders | ||
| Cylinder oil BN |
Common Failure Modes
Expert tips
- 💡 The 8-cylinder configuration offers optimal vibration behaviour – nevertheless inspect the vibration damper
- 💡 The compact 400 mm bore allows onboard maintenance without a dry dock – keep special tools for methanol injectors on board
- 💡 Methanol energy content approx. 50% of HFO – consider tank capacity and bunkering planning
Related components
Classification & regulatory
IMO IGF Code (MSC.391(95)) for methanol operation. SOLAS II-1/II-2 fire protection. Class guidelines for dual-fuel. Methanol toxic – appropriate protective measures. No SOx/PM in methanol operation; CO2-neutral with green methanol.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 47
Components & Design
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Technical Data
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