5G80ME-GI10
The MAN 5G80ME-GI10 is a low‑speed, five‑cylinder two‑stroke dual‑fuel engine delivering up to 44.5 MW at 78 rpm, notable for its high‑pressure gas injection and instant switch between HFO/VLSFO and LNG.
Engine Specifications
Inspector Detail
✓ verified
▸
Designation decoded
5 stands for 5 cylinders, G for Green Ultra-Long-Stroke, 80 for 800 mm bore, ME-GI for high-pressure gas injection (LNG), 10 for Mark 10.
Background
The G80ME-GI10 is the Mark 10 version of the G80 LNG engine. 800 mm bore, 3450 mm stroke, S/B 4.31. For large LNG carriers. Latest electronics generation.
Calculated metrics
Inspector checklist
- Cylinder liners: S/B 4.31 at 800 mm — high side forces, LNG cold corrosion wear
- Piston rings: Gas conditions at a large bore
- Cylinder lubrication: BN25, quills at 800 mm
- Gas injection valves: 300 bar at 800 mm
- HP compressor
- Gas detectors
- Crosshead bearing: 3450 mm stroke — high inertia forces
- Stuffing box: Drainage
- Piston rod: Deflection
- ME control
- Gas/diesel changeover
- Safety logic
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Exhaust temperature by cylinder | 310–370 °C (LNG); 350–420 °C (diesel) | Spread >15 °C → check gas/pilot |
| Gas injection pressure | 280–320 bar | Deviation → HP compressor |
| Pmax | ±2 bar | Deviation → control system |
| Crosshead bearing temperature | 55–65 °C | Rise → investigate |
Common Failure Modes
Expert tips
- 💡 G80ME-GI10 with S/B 4.31: More moderate S/B than the 9.5 version (4.65) — lower side forces, but 3450 mm stroke remains considerable
- 💡 Mark 10 offers improved control electronics — implement MAN software updates promptly
- 💡 800 mm bore: Inspect gas injection valves at every piston withdrawal — the 300 bar high-pressure valves are wear-intensive
Related components
Classification & regulatory
IMO Tier II/III. IGC Code. SOLAS. MARPOL — LNG SOx-free, CO2 -25%.
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 36
Components & Design
Component data being added…
Technical Data
🤖 Ask about this model
One free question — answered like a marine engineer. No account needed.
Suppliers & Spare Parts
Direct links to manufacturer, datasheet, spare-parts portal and dealers — request access below.
📄 Request sourcing links & documentsCases, daily reports, timesheets and AI troubleshooting in the OceanSphere Marine app — free for 14 days.
Start free trial →Find manufacturers, repair shops and spare-part dealers in the Maritime Network — our global company directory.
Maritime Network →