6S70ME-LGIM9.6
The MAN 6S70ME-LGIM9.6 is a low‑speed, six‑cylinder two‑stroke main engine delivering up to 48 MW at 91 rpm, featuring dual‑fuel operation with diesel pilot ignition and high‑pressure methanol injection for Tier III emissions compliance.
Engine Specifications
Inspector Detail
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Designation decoded
6 = number of cylinders, S = Super Long Stroke, 70 = bore 700 mm, ME = MAN Electronically controlled, LGIM = Liquid Gas Injection Methanol, 9.6 = Mark 9.6 control generation.
Background
The S70ME-LGIM is the Super-Long-Stroke variant of the 70 platform. Shorter stroke (2800 vs. 3256 mm) than the G variant, higher rated speed. Typical for medium-to-large container ships and tankers with fixed-pitch propellers. The S70 platform is one of MAN's best-selling series and is now increasingly ordered as an LGIM variant.
Calculated metrics
Inspector checklist
- High-pressure pumps 600-700 bar: tightness, leak sensors
- Injection valves: spray pattern for the 700 mm combustion chamber, check for coking
- Double-wall piping: leak detection, ventilation
- Fuel changeover: run the complete purge cycle
- Liners 700 mm: BN 25-40, document liner wear
- Piston rings: bore-polishing risk with clean methanol combustion
- Crosshead: S/B=4.0, moderate side forces vs. the G variant
- Stuffing box: methanol leakage creates an explosion hazard in the crankcase
- HPS 300 bar: oil quality, filtration
- FIVA: methanol fuel maps, Mark 9.6 software
- Methanol injection timing: tolerance ±0.5 degrees CA
- Methanol detectors (flame ionization/IR)
- ESD: automatic diesel fallback, function test
- Fuel prep room: UV/IR detectors for the invisible methanol flame
- OMD: threshold <2.5% LEL
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature (methanol) | 285-365 °C | >25 °C spread: injector problem |
| Methanol injection pressure | 600-700 bar | Deviation: check pump/filter |
| Cylinder oil consumption | 0.5-0.8 g/kWh (BN 25-40) | Incorrect dosing: liner damage |
| Pilot fuel fraction | 3-5% | >8%: methanol injector defective |
| OMD | <2.5% LEL | Rise: methanol leakage, STOP IMMEDIATELY |
Common Failure Modes
Expert tips
- 💡 S70 vs. G70: the S variant has 400 mm less stroke and therefore less crosshead stress, but is less efficient at low speeds — monitor combustion particularly closely during slow steaming in methanol mode.
- 💡 During methanol operation on the S70, the injection window is shorter than on the G70 — injector timing precision is more critical.
- 💡 Advantage of the S70: a more compact engine at the same bore, simpler crosshead maintenance due to the shorter stroke.
Related components
Classification & regulatory
IGF Code, LFPF class notation. IMO Tier II without after-treatment in methanol mode. 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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