Main Engine 4-Stroke · Main Engines (4-Stroke)
The Wärtsilä 6LW64 is a medium‑speed, four‑stroke trunk piston diesel engine delivering about 10.9 MW at ~333 rpm, known for its high specific power and L‑series version optimized for gear‑propulsion.
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| Lube oil analysis | every 500 running hours or per the maker's schedule |
|---|---|
| Fuel injector overhaul/nozzle exchange | typically every 4000-8000 running hours - confirm against the maker's schedule for this rating |
| Cylinder liner/piston inspection | typically every 12000-16000 running hours, varying with fuel quality and load profile |
| Turbocharger overhaul | typically every 12000-24000 running hours depending on the maker's service scheme |
| Main/big-end bearing inspection | commonly every 12000-16000 running hours per the manual |
| Valve seat and guide inspection | alongside scheduled piston/liner overhaul |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner wear | typically renewed when diametral wear reaches roughly 0.3-0.5% of nominal bore for this engine class - confirm the exact figure against the engine's own manual |
|---|---|
| Piston ring end gap | typically 0.8-1.5 mm as-new for this bore class; renew per the maker's wear limit table rather than a fixed figure |
| Main/big-end bearing clearance | renew when clearance approaches roughly double the as-new value stated in the manual - confirm against the manufacturer's limits |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Typically covered under Continuous Survey Machinery if enrolled; surveyors commonly check crankcase explosion relief devices, governor/overspeed trip function, and lube oil filter condition, and cross-check running-hour and overhaul records (liner, piston, bearing renewals) against the maker's recommended intervals.
Estimated lifetime: Medium-speed trunk piston engines of this class are commonly designed for a total service life well beyond 100,000 running hours across successive overhauls; a realistic interval between major liner/piston/bearing renewals is roughly 12,000-24,000 running hours depending on fuel quality and load profile.
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