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Wärtsilä
Wärtsilä 8LW38
The Wärtsilä 8LW38 is an eight‑cylinder, medium‑speed (600 rpm) trunk‑piston diesel engine delivering roughly 5.3–5.8 MW of power, designed for dual‑fuel operation on HFO or MGO.
5600.0 kW
Power
Engine Specifications
8
Cylinders
380 mm
Bore
475 mm
Stroke
Components & Design
Component data being added…
Technical Data
Mean Effective Pressure (MEP)
2.7 MPa
Mean Piston Speed
9.5 m/s
Power per Cylinder
660–725 kW
Piston Displacement per Cylinder
53.9 liters
Valves per Cylinder
2 inlet + 2 exhaust
Engine Speed Class
Medium-speed (600 rpm)
Weight Range
90–200 tons (6L38 to 16V38)
Cylinder Bore Class
400 mm class
configuration
L
rpm
600
fuel type
HFO/MGO
technology
Medium-Speed Trunk Piston
displacement l per cyl
53.9
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Common failures & inspection points
Cold Corrosion of Cylinder Liners - Sulfuric acid formation from fuel sulfur content when liner temperatures fall below acid dew point; piston ring sticking in
Cylinder Liner Wear & Piston Ring Degradation - Chrome coating peeling from low residual alkalinity (BN) in cylinder oil; groove sticking allows combustion gas
Turbocharger Overhaul Cycle - Major service required every ~50,000 operating hours; rotating parts replacement mandatory; compressor wheel subject to foreign ob
Exhaust Valve Seat Recession - Gradual erosion of valve seat from combustion temperatures and abrasive exhaust gas erosion; valve sinks progressively deeper; de
Shaft Seal & Main Bearing Wear - Stern tube bearing clearance degradation from extended service; shaft seals subject to silt/sand ingestion in coastal/river ser
Type-general inspection and maintenance points for this equipment category — not model-specific.
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Equipment Model #66615
· ✓ still in production