5X72DF-M2
The WinGD 5X72DF-M2 is a low‑speed, inline‑five 2‑stroke dual‑fuel main engine capable of running on methanol and marine diesel oil, delivering up to roughly 80 MW with reversible operation.
Engine Specifications
Inspector Detail
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Common issues
- Cylinder liner and piston ring wear accelerated in methanol mode if the cylinder lubrication feed rate is not adjusted for the fuel's different combustion characteristics
- Fuel injection/methanol admission valve wear affecting cylinder balance
- Pilot fuel (MGO) injector fouling
- Crosshead and guide shoe wear from long-term operation, as with any low-speed two-stroke
- Scavenge port fouling or deposit buildup
- Exhaust valve spindle and seat wear from thermal cycling between fuel modes
- Methanol fuel supply system corrosion where materials are not matched to the fuel
- Turbocharger fouling on the exhaust side
Inspection checklist
- Record cylinder-to-cylinder exhaust temperature and firing pressure spread in both fuel modes
- Inspect crosshead bearings and guide shoes per the running-hour schedule
- Check scavenge ports for deposits during scavenge space inspection
- Verify methanol fuel supply system integrity, including double-walled piping and vapour detection
- Inspect pilot fuel injectors and methanol admission valves
- Check cylinder liner wear by calibrated gauging at scheduled intervals
- Inspect exhaust valve spindle, seat and rotator condition
- Review the engine control system fault log for both fuel modes
- Check turbocharger condition and cleanliness
- Verify crankcase and stuffing box oil mist/vapour detection function
Service intervals
| Cylinder oil feed rate check/adjustment | condition-based, adjusted for fuel mode - confirm against the engine's own manual |
| Scavenge space inspection | engine-hour based per the manufacturer's schedule for two-stroke crosshead engines of this class - confirm against the manual |
| Exhaust valve overhaul | engine-hour based per the manufacturer's schedule - confirm against the manual |
| Crosshead bearing inspection | per the manufacturer's running-hour schedule for two-stroke crosshead engines - confirm against the manual |
| Methanol fuel system safety function test | per class and IGF Code requirements at defined intervals |
| Turbocharger inspection | condition-based, typically several thousand hours between overhauls for two-stroke main engines - confirm against the manual |
Typical wear limits
| Cylinder liner wear (diametral) | commonly assessed against roughly 0.6-1.0% of bore diameter as a renewal guide for low-speed two-stroke engines - confirm against the manufacturer's own limit, as dual-fuel operation can shift the wear pattern |
| Piston ring end gap (new) | typically in the 4-8 mm range for engines in this large bore class - confirm against the engine's own manual |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Cylinder liners and piston ring sets
- Exhaust valve spindle and seat
- Methanol admission valves
- Pilot fuel injectors
- Crosshead bearing shells
- Turbocharger repair kit
- Fuel system seals compatible with methanol service
- Scavenge drain valves
Safety
- Methanol is toxic and flammable with a nearly invisible flame - fuel system leaks are a serious fire and health hazard, not just an explosion risk
- Double-walled fuel piping and the ventilated interbarrier space must be verified intact before methanol-mode operation
- Crankcase explosion risk on any two-stroke engine with degraded bearings - relief doors and oil mist detection must be verified
- Hot exhaust and turbocharger surfaces at this size of main engine
- Confined-space hazards in the scavenge space and crankcase during internal inspection
Class survey
As a methanol dual-fuel main engine under the IGF Code, class survey includes periodic testing of the fuel gas/vapour detection, ventilation and double-walled piping systems alongside the engine's own Continuous Survey Machinery items, and closer initial survey scrutiny should be expected given the more limited fleet-wide service history of methanol dual-fuel two-stroke engines compared to LNG dual-fuel.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Verify fuel rail pressure within spec; check power supply and wiring to fuel control
Inspect nozzle tips at ~8,000–10,000 operating hours; replace spare kit per schedule
Verify centrifugal separator bypass operation; monitor oil condition via sampling; check crankcase drain integrity
Monitor cylinder pressure diagrams; verify pilot fuel injection timing/quantity; track exhaust temps and emission compliance
Install filtration for dust-prone routes; schedule periodic cooler inspection and cleaning; monitor scavenge air temperature trend
Type-general inspection and maintenance points for this equipment category — not model-specific.
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