5X72DF-A
The WinGD X72DF‑A is a low‑speed, camshaft‑less 5‑cylinder, 2‑stroke main engine capable of running on diesel/HFO, methanol and ammonia (dual‑fuel), delivering up to 18 300 kW at 85 rpm while meeting IMO Tier III emissions in gas mode.
Engine Specifications
Inspector Detail
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Common issues
- Gas admission valve wear or leakage affecting gas-mode combustion
- Cylinder liner and piston ring wear over extended running hours
- Transient issues during fuel changeover between diesel and gas mode
- Crosshead/guide shoe wear
- Exhaust valve spindle burning or seat wear
- Scavenge air system fouling
- Corrosion in fuel system components exposed to methanol
Inspection checklist
- Borescope inspection of cylinder liner and piston crown condition
- Check exhaust valve spindle and seat condition and rotation
- Inspect gas admission valves for leakage and correct function
- Check crosshead bearing clearance and guide shoe wear
- Inspect scavenge air ports/receiver for fouling and deposits
- Monitor cylinder pressure indicator diagrams (Pmax, Pcomp) for cylinder balance
- Check camshaft-less electronic control system sensor function
- Inspect turbocharger condition and cleanliness
- Verify fuel changeover sequence and safety interlocks in dual-fuel mode
- Check tie-bolt/foundation bolt tightness per class-required intervals
Service intervals
| Cylinder oil feed rate | adjusted continuously based on running hours and condition monitoring |
| Piston overhaul/pulling for inspection | commonly in the 12000-18000 hour range for this engine class, condition-based |
| Exhaust valve overhaul | typically every 8000-16000 hours depending on fuel and duty |
| Turbocharger overhaul | per manufacturer interval, commonly 12000-24000 hours |
| Crankshaft deflection readings | at each survey, typically annually |
| Gas fuel system function test | per class/flag dual-fuel notation requirements, typically annual |
Typical wear limits
| Cylinder liner wear | modern low-speed engines typically wear only a small fraction of bore diameter per thousand running hours - the engine's own manual and class wear-limit table govern the actual condemning limit, do not use a generic figure |
| Piston ring gap | opens progressively over service life - assess against the engine's own manual tolerance rather than a fixed value |
| Crosshead bearing clearance | checked against manufacturer running-clearance tables specific to this bore/stroke - confirm before use, no generic figure applies |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Piston ring set (order against the engine's build specification - no generic part number)
- Exhaust valve spindle and seat
- Cylinder liner
- Gas admission valve
- Crosshead bearing shells
- Turbocharger repair kit
- Fuel injection/gas admission control unit spares
Safety
- Gas/methanol fuel system leak risk - verify gas detection and ventilation systems are functional
- Crankcase explosion risk - oil mist detection is critical on large low-speed engines
- High-pressure fuel system hazard
- Hot surfaces on exhaust manifold and turbocharger
- Methanol toxicity and flammability - PPE and ventilation required around the fuel system
Class survey
Continuous Survey Machinery for large 2-stroke engines typically requires crankshaft deflection records, indicator diagram/cylinder balance data, and documented piston/liner/bearing renewal history; for dual-fuel notation, class also checks gas safety system function tests and crew familiarisation records.
Other Cylinder Configurations 30
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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