Main Engine 2-Stroke · Main Engines (2-Stroke)
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.
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| 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 |
| 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.
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.
Estimated lifetime: Low-speed 2-stroke main engines of this class are typically designed for 25+ years of service with periodic overhaul; individual components (liners, pistons, bearings) are renewed on a condition/running-hour basis rather than the whole engine being time-expired.
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