8G70ME-GA10
The MAN 8G70ME-GA10 is an eight‑cylinder, low‑speed two‑stroke main engine delivering up to 55 MW (≈54 960 kW) at 91 rpm, notable for its dual‑fuel capability (LNG/ethane plus conventional marine fuels) and Tier III emission compliance.
Engine Specifications
Inspector Detail
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Designation decoded
8 stands for 8 cylinders, G for Green Ultra-Long-Stroke, 70 for 700 mm bore, ME-GA for ethane-capable gas injection, 10 for Mark 10.
Background
The G70ME-GA10 with 8 cylinders is one of the most powerful and efficient ME-GA engines. S/B 4.65 at 700 mm and 3256 mm stroke. 8 cylinders for maximum power and the best vibration behavior. For the largest VLEC/VLGC.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.65 — extremely high side forces plus gas cold corrosion wear
- Piston rings: Maximum side pressure under gas conditions
- Cylinder lubrication: BN25, calibrate Alpha Lubricator exactly, test quills at 700 mm
- Gas injection valves: Tightness at all 8 cylinders — higher thermal load with G-type
- FGSS: Compressor, evaporator, safety valves
- Gas detectors
- Crosshead bearing: 3256 mm stroke — maximum forces at 8 bearings
- Stuffing box: S/B 4.65 — maximum relative movement even in gas operation
- Piston rod: Deflection at all 8 crank throws
- ME control: FIVA, HPS/HCU, EICU
- Gas/diesel changeover
- Safety logic
- Scavenge air box: Accessible at 700 mm — despite gas, oil ingress with G-type
- Turbocharger: 2 TC
- Exhaust temperature across 8 cylinders
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature by cylinder | 320–380 °C (gas); 340–410 °C (diesel) | Spread >15 °C → check gas/pilot |
| Gas injection pressure | 250–300 bar | Deviation → compressor/valve |
| Crosshead bearing temperature | 55–65 °C | Rise → investigate immediately |
| Pmax | ±2 bar | Deviation → control system |
Common Failure Modes
Expert tips
- 💡 8×G70ME-GA10 is one of the most powerful and efficient ME-GA engines — the combination of G-type, gas, and 8 cylinders offers highest efficiency with stable operation
- 💡 Cylinder oil management at S/B 4.65 and gas: BN25 with LDF (Load-Dependent Feed) — the electronic dosing must be calibrated differently for gas than for diesel
- 💡 8 cylinders with 2 TC: Test the TC cut-out procedure during slow steaming, also relevant in gas operation
Related components
Classification & regulatory
IMO Tier II/III. IGC Code. SOLAS. MARPOL — maximum emissions reduction.
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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