7G60ME-GI10
The MAN 7G60ME-GI10 is a 7‑cylinder, low‑speed 2‑stroke dual‑fuel main engine delivering up to 34.3 MW at 105 rpm, notable for its high‑pressure LNG injection and instant fuel switching capability.
Engine Specifications
Inspector Detail
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Designation decoded
{'7': 'Number of cylinders: 7', 'G': 'Green ultra-long-stroke – stroke/bore ratio approx. 4.65', '60': 'Cylinder bore 600 mm', 'ME': 'Electronically controlled two-stroke engine (MAN Electronic)', 'GI': 'Gas Injection – high-pressure gas injection (approx. 300 bar, diesel cycle)', '10': 'Design version / Mark number 10'}
Background
The 7G60ME-GI10 is a green ultra-long-stroke two-stroke engine with 600 mm bore, optimised for the lowest speeds and maximum propeller efficiency on LNG-powered ships. The G series offers the highest stroke/bore ratio in the MAN portfolio and is particularly suited to slow-running applications such as bulk carriers and tankers. The 7-cylinder configuration requires special torsional vibration analysis.
Calculated metrics
Inspector checklist
- Cylinder liners at 600 mm bore and ultra-long-stroke – increased thermal and mechanical loading from the long stroke (2790 mm)
- Check piston rings for wear and gas blow-by formation – long stroke increases stress
- Inspect piston crown for thermal crack formation and erosion
- Check Alpha Lubricator dosing for gas operation (BN25)
- Document running surface pattern – G-type shows specific wear patterns due to high piston speed in the mid-stroke range
- Check ELGI gas injection valves for tightness and function at 300 bar operating pressure
- Inspect double-wall piping system for leaks and mechanical integrity
- Evaluate HP compressor operating data (pressure, temperature, vibration)
- Check sealing oil system of the gas valves for pressure retention and oil quality
- Function-test gas safety valves and emergency shutdowns
- Check FIVA valves for response behaviour and freedom from leakage
- HPS/HCU – check hydraulic pressure, oil level, filter elements
- EICU – read out fault memory, document software version
- Calibrate cylinder pressure sensors – particularly important for the G type due to the long expansion phase
- Test gas/diesel switchover behaviour and safety interlocks
- Check turbocharger – bearings, compressor, turbine and seals
- Compare exhaust temperatures in gas and diesel operation
- Inspect scavenge air duct for deposits and water ingress
- Check charge air cooler for fouling and corrosion
- Crosshead bearing – increased loading from ultra-long-stroke (2790 mm), check wear and clearance
- Check crosshead pin and guide rails for scoring marks
- Check stuffing box for gas tightness – safety-critical in ME-GI operation
- Monitor oil scraper ring function – long stroke increases mechanical loading
- Check torsional vibration damper for condition, oil level and temperature
- Compare vibration measurements with manufacturer reference values
- 7-cylinder G-type – particularly critical combination of lowest speed and torsional vibration risk
- Strictly observe and document the barred speed range
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Gas injection pressure | 280–320 bar | Pressure drop indicates HP compressor degradation or valve leakage |
| Exhaust temperature after cylinder (gas operation) | 330–410 °C | Spread >50 °C indicates uneven gas distribution |
| Exhaust temperature after cylinder (diesel operation) | 350–430 °C | Individual deviation indicates injection or valve problem |
| Pmax (firing pressure) | 140–165 bar (load-dependent) | Low Pmax in gas operation indicates ignition problems |
| Pilot oil share | 3–8% of total energy | Increase indicates poor gas combustion |
| Cylinder oil dosing | 0.6–0.8 g/kWh (gas operation) | Incorrect dosing leads to wear or scale formation |
| Scavenge air pressure | 2.0–3.5 bar (load-dependent) | Too low – turbocharger problem or cooler fouled |
| Torsional vibration amplitude | Per manufacturer specification | Elevated values require immediate inspection of the vibration damper |
Common Failure Modes
Expert tips
- 💡 The G ultra-long-stroke with 7 cylinders combines two risk factors – lowest speed and torsional vibration susceptibility. Vibration damper and barred speed range require the highest attention.
- 💡 Consistently use BN25 cylinder oil in gas operation – the cold corrosion risk is particularly pronounced on the G-type due to lower combustion temperature.
- 💡 Methane is lighter than air – regularly calibrate and test gas detectors at ceiling level and in double-wall spaces.
Related components
Classification & regulatory
['IMO Tier II – NOx emission limits, Tier III achievable with EGR or SCR', 'IGC Code – mandatory requirements for gas fuel systems on ships', 'SOLAS Chapter II-1 – safety regulations for engine rooms with dual-fuel installations', 'MARPOL Annex VI – SOx/NOx emissions, LNG operation significantly simplifies ECA compliance', 'Classification society – observe 7-cylinder torsional vibration approval and G-type special conditions']
Reference content for inspector orientation. Always verify against manufacturer's manual, latest service letters and class society requirements.
Other Cylinder Configurations 36
Components & Design
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Technical Data
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