5S70ME-GA10
The MAN 5S70ME-GA10 is a high‑power, low‑speed 2‑stroke main engine delivering up to 40 400 kW at 91 rpm, notable for its Tier III NOx compliance and dual‑fuel capability (HFO, VLSFO, MDO, ethane and LNG).
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-GA for electronically controlled two-stroke engine with ethane-capable gas injection, 10 for Mark 10.
Background
The S70ME-GA10 is a medium-to-large dual-fuel engine of the ME-GA series for VLEC/VLGC use. S/B 4.0 at 700 mm bore. Ethane-capable high-pressure gas injection. Mark 10 with fully electronic control.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.0 at 700 mm — watch side forces, cold corrosion wear risk in gas operation
- Piston rings: Different lubrication conditions in gas operation
- Cylinder lubrication: Reduce BN in gas operation
- High-pressure gas injection valves: Tightness safety-critical
- FGSS: Compressor, evaporator, safety valves
- Gas detectors: Function and calibration
- ME control: FIVA valves, HPS/HCU, EICU
- Gas/diesel changeover: Test procedure
- Safety logic: Gas trip, shutdown
- Scavenge air box: Cleaner in gas operation
- Turbocharger: Less fouling with gas
- Exhaust temperature: Lower in gas operation
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature by cylinder | 320–380 °C (gas); 350–420 °C (diesel) | Spread >15 °C → check gas/pilot injection |
| Gas injection pressure | 250–300 bar | Deviation → compressor/valve |
| Pmax | ±2 bar cylinder balance | Deviation → control system |
| Pilot fuel share | 3–8% of total energy | Too high → inefficient gas injection |
Common Failure Modes
Expert tips
- 💡 S70ME-GA10 with 700 mm bore: When checking quills in gas operation, note that the gas film on the liner differs from HFO — lubrication requirements differ
- 💡 Dual-fuel changeover: Avoid thermal shock at 700 mm bore — slow transition recommended
- 💡 5 cylinders at 700 mm: Watch for torsional vibrations at speed changes (e.g. during gas/diesel changeover)
Related components
Classification & regulatory
IMO Tier II/III-capable. IGC Code. SOLAS gas requirements. MARPOL — gas operation nearly SOx-free.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 15
Components & Design
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Technical Data
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