7G70ME-GA10
The MAN 7G70ME-GA10 is a high‑power, low‑speed 2‑stroke marine diesel engine with dual‑fuel capability (HFO/VLSFO/MDO and ethane/LNG), delivering up to 48 MW at 91 rpm while meeting IMO Tier III emission limits.
Engine Specifications
Inspector Detail
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Designation decoded
7 stands for 7 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 7 cylinders combines Green Ultra-Long-Stroke (S/B 4.65) with ethane-capable gas injection. Maximum efficiency for VLEC/VLGC. 3256 mm stroke at 700 mm bore.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.65 — extremely high side forces PLUS gas cold corrosion wear — double challenge
- Piston rings: Maximum side pressure under gas lubrication conditions
- Cylinder lubrication: BN adjustment at S/B 4.65 and gas especially critical
- Gas injection valves: Tightness — higher thermal load with G-type
- FGSS: Compressor, evaporator, safety valves
- Gas detectors
- Crosshead bearing: 3256 mm stroke — maximum forces
- Stuffing box: S/B 4.65 — maximum relative movement — check drainage even in gas operation
- Piston rod: Deflection
- ME control: FIVA, HPS/HCU, EICU
- Gas/diesel changeover
- Safety logic
- Scavenge air box: Accessible at 700 mm — despite gas, oil ingress via stuffing box with G-type
- Turbocharger
- Exhaust temperature
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
- 💡 G70ME-GA10 with 7 cylinders: Triple challenge — S/B 4.65, gas operation, torsional vibrations with 7 cylinders
- 💡 Cylinder oil management with G-type and gas: BN25 with precise feed rate — the electronic dosing must be exactly calibrated
- 💡 Inspect the scavenge air box despite gas — G-type stuffing boxes generate oil ingress regardless of fuel
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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