7S60ME-GI10
The MAN 7S60ME-GI10 is a low‑speed, 2‑stroke, 7‑cylinder dual‑fuel main engine delivering up to 39 550 kW at 105 rpm, able to run on HFO, VLSFO, MDO or LNG with instantaneous fuel switching.
Engine Specifications
Inspector Detail
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Designation decoded
{'7': 'Number of cylinders: 7', 'S': 'Super-long-stroke – stroke/bore ratio approx. 4.0', '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 7S60ME-GI10 is a super-long-stroke two-stroke engine with 600 mm bore and high-pressure gas injection, designed for medium to large LNG-powered ships such as Aframax tankers and container ships. It offers a balanced ratio between speed and power in the mid power segment of the MAN ME-GI portfolio. The 7-cylinder configuration requires particular attention to torsional vibration.
Calculated metrics
Inspector checklist
- Document cylinder liner wear at 600 mm bore – compare wear patterns in gas vs. diesel operation
- Check piston rings for end gap, wear and gas blow-by formation
- Inspect piston crown for erosion, thermal cracks and condition of gas sealing surfaces
- Alpha Lubricator – ensure correct dosing and BN25 oil in gas operation
- Document running surface condition and assess scuffing risk after fuel switchover
- Check ELGI gas injection valves for tightness and correct opening/closing behaviour
- Inspect double-wall piping system for leaks and mechanical damage
- Monitor HP compressor operating parameters and compare with reference values
- Check sealing oil system – pressure, quality and consumption
- Test safety valves and the Master Gas Fuel Valve
- FIVA valves – check hydraulic tightness and response time
- HPS/HCU – check system pressure, oil level and filter condition
- EICU – read out fault memory, document software version and latest updates
- Cylinder pressure monitoring – check sensor calibration and reading plausibility
- Test gas/diesel switchover and emergency procedures
- Inspect turbocharger – bearing clearance, compressor wheel, turbine wheel and seals
- Compare exhaust temperature profiles gas/diesel and assess cylinder balance
- Check charge air cooler for fouling and condensate drainage
- Check scavenge air duct for oil and water deposits
- Measure crosshead bearing – wear and bearing clearance
- Check stuffing box for gas tightness – safety-critical in ME-GI operation
- Check oil scraper rings and leak-off oil quantity
- Inspect telescopic pipe seals
- Check torsional vibration damper for function, oil level and temperature
- Monitor 7-cylinder-specific vibration orders
- Document the barred speed range and verify compliance
- Compare torsional vibration record with operating data
Logbook reference values
| Parameter | Expected | Deviation means |
|---|---|---|
| Gas injection pressure | 280–320 bar | Deviation indicates HP compressor wear or gas valve leakage |
| Exhaust temperature after cylinder (gas operation) | 330–410 °C | Spread >50 °C between cylinders indicates uneven gas distribution or ignition problems |
| Exhaust temperature after cylinder (diesel operation) | 350–430 °C | Individual deviation indicates injector nozzle or valve fault |
| Pmax (firing pressure) | 140–165 bar (load-dependent) | Low Pmax in gas mode can indicate a pilot oil ignition problem |
| Pilot oil share | 3–8% of total energy | Increased share indicates ignition problems in gas operation |
| Cylinder oil dosing | 0.6–0.8 g/kWh (gas operation) | Overdosing leads to scale deposits, underdosing to increased wear |
Common Failure Modes
Expert tips
- 💡 For the 7-cylinder configuration, treat the torsional vibration damper as a critical component – regular inspection and oil change per manufacturer specification.
- 💡 Use BN25 cylinder oil in gas operation and switch promptly to a higher BN value (40–70) on fuel change to diesel – document the transition period.
- 💡 Methane is lighter than air – calibrate gas detectors in the upper areas of the engine room and in double-wall spaces with particular care.
Related components
Classification & regulatory
['IMO Tier II – NOx emission limits, Tier III achievable with EGR or SCR', 'IGC Code – mandatory regulations for gas-fuelled ships', 'SOLAS Chapter II-1 – fire protection and safety requirements for dual-fuel installations', 'MARPOL Annex VI – emission limits, LNG operation eases ECA compliance', 'Classification society – 7-cylinder torsional vibration analysis and special approval 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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