6G70ME-GA10
The MAN 6G70ME-GA10 is a low‑speed, six‑cylinder, two‑stroke marine main engine delivering up to 41 MW (≈55,500 hp) at 91 rpm, notable for its dual‑fuel capability (HFO, VLSFO, MDO, ethane and LNG) and Tier III NOx compliance.
Engine Specifications
Inspector Detail
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Designation decoded
6 stands for 6 cylinders, G for Green Ultra-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 G70ME-GA10 with 6 cylinders is the Green Ultra-Long-Stroke variant of the 70 bore class with ethane-capable gas injection. S/B 4.65 for maximum efficiency. The combination of G-type and gas operation optimizes propulsion efficiency and maximizes emissions reduction.
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 and quill flow at 700 mm — especially critical with G-type and gas
- Gas injection valves: Tightness — higher thermal load with G-type long stroke
- FGSS: Compressor, evaporator, safety valves
- Gas detectors: Calibration
- ME control: FIVA valves, HPS/HCU, EICU
- Gas/diesel changeover
- Safety logic
- Crosshead bearing: 3256 mm stroke — maximum forces
- Stuffing box: S/B 4.65 — maximum relative movement
- Piston rod: Deflection
- Scavenge air box: Accessible at 700 mm — despite gas operation, 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 |
| Pmax | ±2 bar cylinder balance | Deviation → control system |
| Crosshead bearing temperature | 55–65 °C | Rise → investigate immediately |
Common Failure Modes
Expert tips
- 💡 G70ME-GA10 with S/B 4.65 and gas operation: Triple challenge — extreme side forces, gas-specific lubrication, and stuffing box loading. Cylinder oil management has the highest priority
- 💡 In gas operation with G-type: BN25 cylinder oil with precise feed rate — too much causes deposits, too little causes dry running
- 💡 Scavenge air box: Inspect despite cleaner gas operation — the G-type stuffing box loading generates oil ingress regardless of fuel
Related components
Classification & regulatory
IMO Tier II/III. IGC Code. SOLAS. MARPOL — maximum emissions reduction through G-type + gas.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 15
Components & Design
Component data being added…
Technical Data
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