7LW25DF
The Wärtsilä 7LW25DF is a medium‑speed, 7‑cylinder, 4‑stroke trunk piston main engine offering dual‑fuel operation on diesel, LNG and ammonia with up to 32 000 h TBO.
Engine Specifications
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Inspect fuel pressure curves; regularly check high-pressure lines for leaks; fuel analysis (water path, particle path)
Monitor crankcase ventilation; check sump oil analysis (iron Fe, chromium Cr, base number BN); piston ring wear during regular sump inspection
Monitor turbocharger pressure ratio and exhaust gas temperatures; check scavenge air temperature after charger; periodic ultrasonic inspection or borescope if suspected
Inspect urea inventory and metering system; check SCR catalyst for wear/fouling; exhaust gas testing per IMO Tier III standards
Type-general inspection and maintenance points for this equipment category — not model-specific.
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