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Wärtsilä
12VW34DF
The Wärtsilä 12VW34DF is a V‑type 12‑cylinder, 4‑stroke dual‑fuel main engine delivering up to 4 680 kW at 720 rpm, capable of running on LNG or HFO with low emissions.
4680.0 kW
Power
Engine Specifications
12
Cylinders
340 mm
Bore
400 mm
Stroke
4-stroke
Stroke Type
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
power kw
4680
rpm
720
fuel type
LNG/HFO (Dual-Fuel)
configuration
V
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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 #123133
· ✓ still in production
Wer liefert dieses Teil? 226 Betriebe im Verzeichnis · 15 aus Herstellerlisten
Wartsila Ships Repairing & Maintenance LLC (Repairs and Services only)
NoneUnited Arab Emirates
✓ autorisiert
Chongqing Chuanqing Marine Power Equipment Co., Ltd.
Chongqing, China
FM-Power Serviços e Peças
Rio de Janeiro, Brazil
MARE Supply & Services
Haarlem, Netherlands
Marine Ecology Equipment OÜ
Tallinn, Estonia
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