5S70ME-GI10
The MAN 5S70ME-GI10 is a 5‑cylinder, low‑speed 2‑stroke main engine delivering up to 40.4 MW at 91 rpm, featuring high‑pressure gas injection for dual‑fuel operation (HFO/LNG) and Tier III emission compliance.
Engine Specifications
Inspector Detail
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Designation decoded
5 stands for 5 cylinders, S for Super-Long-Stroke, 70 for 700 mm bore, ME-GI for high-pressure gas injection (LNG), 10 for Mark 10.
Background
The S70ME-GI10 is a large LNG dual-fuel engine. S/B 4.0 at 700 mm. For large LNG carriers. High-pressure gas injection at 300 bar.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.0 at 700 mm — side forces, LNG cold corrosion wear
- Piston rings: Gas conditions
- Cylinder lubrication: BN25, quills at 700 mm
- Gas injection valves: 300 bar tightness
- HP compressor: Condition and redundancy
- Gas detectors
- ME control
- Gas/diesel changeover
- Safety logic
- Scavenge air box: Accessible at 700 mm
- Turbocharger
- Exhaust temperature
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature by cylinder | 310–370 °C (LNG); 350–420 °C (diesel) | Spread >15 °C → check gas/pilot |
| Gas injection pressure | 280–320 bar | Deviation → HP compressor |
| Pmax | ±2 bar | Deviation → control system |
Common Failure Modes
Expert tips
- 💡 S70ME-GI10: Quill checks at 700 mm in LNG operation — lubrication requirements differ from diesel
- 💡 Install HP compressor vibration monitoring and track the trend
- 💡 5 cylinders: Watch for torsional vibrations during gas/diesel changeover
Related components
Classification & regulatory
IMO Tier II/III. IGC Code. SOLAS. MARPOL — LNG SOx-free, CO2 -25%.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 36
Components & Design
Component data being added…
Technical Data
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