Main Engine 4-Stroke · Main Engines (4-Stroke)
The Wärtsilä 8L46TS is an eight‑cylinder, medium‑speed (600 rpm) four‑stroke main propulsion engine with a turbo‑sequential system and dual‑fuel capability, delivering up to 8 400 kW while achieving high thermal efficiency.
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| Lube oil sample analysis | every 500 running hours |
|---|---|
| Fuel injector overhaul | typically every 8,000-12,000 h |
| Turbocharger overhaul | typically every 12,000-18,000 h, each stage per maker schedule |
| Cylinder head/valve overhaul | typically every 12,000-16,000 h |
| Charge air cooler cleaning | every 4,000-6,000 h |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner bore wear | typically 0.3-0.5 mm increase per 1,000 running hours as a rough guide - confirm against the maker's wear table |
|---|---|
| Piston ring gap growth | makers commonly set a scrap limit at several times the as-new gap - confirm against engine manual |
| Main bearing clearance | typically 0.2-0.4 mm depending on bore class - confirm against maker's limits |
| Crankshaft deflection | commonly limited to a few hundredths of a mm per metre of crank throw - confirm against the engine-specific table |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Typically surveyed under Continuous Machinery Survey where enrolled, with crankshaft deflection, cylinder condition and turbocharger overhaul records reviewed; IMO Tier compliance records should be kept with the engine's technical/NOx file.
Estimated lifetime: Medium-speed four-stroke main engines of this bore class are typically designed for top overhaul intervals in the order of 12,000-20,000 running hours, with total engine life well beyond 100,000 hours achievable under good maintenance and fuel quality control.
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