6S60ME-GI10
The MAN 6S60ME-GI10 is a high‑power, low‑speed 2‑stroke dual‑fuel main engine delivering up to 33.9 MW at 105 rpm, capable of running on HFO/VLSFO/MDO or LNG with instant fuel switching.
Engine Specifications
Inspector Detail
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Designation decoded
{'6': 'Number of cylinders: 6', 'S': 'Super-Long-Stroke design (high stroke/bore ratio)', '60': 'Cylinder bore: 600 mm', 'ME': 'Electronically controlled (Man Electronic) two-stroke engine', 'GI': 'Gas Injection – high-pressure gas injection (approx. 300 bar) on the diesel principle', '10': 'Mark 10 – current engine generation'}
Background
The 6S60ME-GI10 is a Super-Long-Stroke dual-fuel engine with a 600 mm bore and 2400 mm stroke from MAN Energy Solutions' ME-GI series. Compared with the G variant, the S version offers a somewhat lower stroke/bore ratio and thus higher rated speeds at the same bore. It is suitable for LNG carriers and medium-sized gas-fuelled container ships.
Calculated metrics
Inspector checklist
- Check cylinder liner for wear and cloverleafing – 600 mm bore allows onboard maintenance
- Check piston rings for wear, gap clearance and seating
- Inspect piston crown for thermal cracking and deposits – fewer deposits in gas mode than diesel
- Verify BN25 cylinder oil dosing in gas operation
- Assess liner temperatures via drain analysis and TBO
- Check gas injection valves for tightness and function
- Check HP compressor for condition, vibration and operating hours
- Check double-wall piping system for leaks in the annulus
- Verify gas injection pressure in the range 280–320 bar
- Test safety valves and Master Gas Fuel Valve
- Check FIVA valves for response behaviour and internal leakage
- Check HPS/HCU system pressure and hydraulic oil quality
- Evaluate EICU alarm history and document software status
- Test gas/diesel switchover and emergency shutdown
- Calibrate knock sensors (if fitted) – ME-GI operates on the diesel principle, knock risk minimal
- Check turbocharger condition, bearing clearance and cleaning
- Inspect scavenge air duct for oil deposits and condensation
- Assess exhaust gas temperature spread cylinder by cylinder – S-type has somewhat higher speed than G-type
- Check exhaust valves for corrosion and seat condition
- Check EGR/SCR (if Tier III) for function and condition
- Check crosshead bearing for wear
- Check stuffing box for gas blow-by and oil leakage
- Inspect piston rod surface for scoring
- Regularly analyse scavenge drain
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Gas injection pressure | 280–320 bar | Pressure drop indicates HP compressor problem or valve leakage |
| Exhaust gas temperature after cylinder (gas mode) | 320–380 °C (load-dependent) | Spread >50 °C shows uneven gas distribution |
| Exhaust gas temperature after cylinder (diesel mode) | 350–420 °C (load-dependent) | Deviation >30 °C indicates injection problems |
| Pmax (firing pressure) | According to test protocol ±5 bar | Deviation mechanically stresses the running gear |
| Pilot fuel share (gas mode) | 3–8 % of total energy | Increased share indicates a gas injection fault |
| Cylinder oil feed rate (gas mode) | 0.6–0.8 g/kWh (BN25) | Incorrect dosing leads to wear or deposits |
Common Failure Modes
Expert tips
- 💡 Compared with the G60, the S60 variant has a lower stroke/bore ratio (4.0 vs. 4.65) and thus typically higher rated speeds – this affects propeller matching and vibration analysis.
- 💡 The HP compressor is the critical single component – check for redundant design and ensure spare parts stock. At 600 mm bore, GI valves can be handled with the ship's crane.
- 💡 Methane is lighter than air – all gas detectors must be mounted on the ceiling. Common inspection finding: incorrect mounting height after a shipyard stay.
Related components
Classification & regulatory
IMO Tier II as standard; Tier III with EGR or SCR. IGC Code fully applicable. SOLAS II-1 Reg. 55 for gas fuel installations. MARPOL Annex VI: LNG almost SOx-free, approx. 25 % CO2 reduction compared to HFO. Additional notation from the classification society required.
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
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