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Wärtsilä

Wärtsilä 8LW34DF

The Wärtsilä 8LW34DF is an eight‑cylinder, low‑speed (750 rpm) four‑stroke marine diesel engine that operates on dual‑fuel common‑rail technology, allowing seamless switching between LNG and conventional liquid fuels while delivering up to 8 MW of power.

Wärtsilä Wärtsilä 8LW34DF
4000.0 kW
Power

Engine Specifications

8
Cylinders
340 mm
Bore
400 mm
Stroke

Components & Design

Component data being added…

Technical Data

Power per cylinder (main engine 34DF) 500 kW @ 750 rpm
Power per cylinder (auxiliary 34DF) 520 kW @ 720-750 rpm
Mean effective pressure (main) 20.0-19.8 bar
Piston speed 9.6-10.0 m/s
Compression ratio (16V/20V) 12.6:1
Engine type 4-stroke, turbocharged intercooled non-reversible
Swept volume per cylinder 36.3 dm³
34DF Max output (16V main) 8000 kW
34DF/34SG Max output (20V genset) 9800 kW
34SG design Spark-ignited, lean-burn, pre-chamber
20V34SG dimensions L:12.7m × W:3.3m × H:4.65m
20V34SG weight 131,500 kg
configuration L
rpm 750
fuel type LNG/HFO/MGO
technology Dual-Fuel Common Rail (LNG/HFO/MGO)
displacement l per cyl 36.3

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Common failures & inspection points

Turbocharger bearing failure - bearing location pins can break, causing the shaft to rotate freely inside housing and potentially damaging the compressor wheel.
Fuel injector tip carbon deposits and clogging - when operating in backup fuel (diesel) mode, liquid fuel deposits on injector tip can thermally decompose ('cra
Gas valve unit (GVU) functionality criticality - GVU valve tightness and proper ventilation during stop sequences essential for safe operation; leakage prevents
Cylinder liner scuffing from insufficient lubrication - mirror polished finish and loss of crosshatch pattern indicate oil starvation; piston rings run dry caus
Load-sharing failures and abnormal shutdown sequences - improper sensor signals or fuel supply irregularities can trigger emergency stops; root causes (fuel sys

Type-general inspection and maintenance points for this equipment category — not model-specific.

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Equipment Model #66601 · ✓ still in production