5G70ME-GA10
The MAN 5G70ME-GA10 is a high‑power, low‑speed 2‑stroke main engine delivering up to 34 350 kW at 91 rpm, designed for dual‑fuel operation (HFO, VLSFO, MDO, ethane and LNG) with Tier III emission compliance.
Engine Specifications
Inspector Detail
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Designation decoded
5 stands for 5 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 is the Green Ultra-Long-Stroke variant of the 70 bore class with ethane-capable gas injection. S/B 4.65 at 700 mm for maximum efficiency. For VLEC/VLGC with the highest efficiency requirements.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.65 — extremely high side forces plus gas operation cold corrosion wear risk — double challenge
- Piston rings: Maximum side pressure under gas-specific lubrication conditions
- Cylinder lubrication: BN adjustment in gas operation critical at S/B 4.65
- Gas injection valves: Tightness and function — higher thermal load with G-type long stroke
- FGSS: Compressor, evaporator, safety valves
- Gas detectors: Calibration, especially near the floor
- ME control: FIVA valves, HPS/HCU, EICU
- Test gas/diesel changeover
- Safety logic: Gas trip functions
- Crosshead bearing: 3256 mm stroke — inertia and side forces maximal
- Stuffing box: S/B 4.65 maximum relative movement
- Piston rod: Deflection and surface
- Scavenge air box: Cleaner in gas operation, but stuffing box oil ingress possible with G-type
- Turbocharger: Less fouling with gas
- Exhaust temperature: Lower in gas than diesel
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 injection |
| 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: The combination of extreme S/B and gas operation is a double challenge — high side forces PLUS missing HFO ash film require precise cylinder oil calibration
- 💡 In gas operation: Keep cooling water temperature >65 °C — gas lacks sulfur-related acid formation, but the lower combustion temperature can still lead to condensation
- 💡 5 cylinders with G-type: Severe torsional vibrations possible — vibration damper is top priority
Related components
Classification & regulatory
IMO Tier II/III. IGC Code. SOLAS gas requirements. MARPOL — gas operation nearly SOx-free, CO2 reduction ~20%.
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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