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Wärtsilä
7LW22
The Wärtsilä 7LW22 is a 7‑cylinder, 4‑stroke trunk piston diesel main engine delivering about 1 015 kW at 1 000 rpm, designed for HFO/MDO fuel and known for its robust mid‑speed performance.
1015.0 kW
Power
Engine Specifications
7
Cylinders
220 mm
Bore
320 mm
Stroke
4-stroke
Stroke Type
Components & Design
Component data being added…
Technical Data
Typ
4-stroke, direct injection, turbocharged and charge air cooling
Verdichtungsverhältnis (Vasa 32)
13.8:1
Mittlerer Druck (D-Rating)
21.9 bar
Mittlerer Druck (E-Rating)
24 bar
Spezifischer Brennstoffverbrauch (100% Last HFO)
187 g/kWh
Spezifischer Brennstoffverbrauch (85% Last HFO)
185 g/kWh
Mittlere Kolbengeschwindigkeit (Vasa 32)
8.4 m/s
Verdrängervolumen je Zylinder (Vasa 32)
28.15 dm³
Ventile je Zylinder
2 Einlass + 2 Auslass (Vasa 22: 4-Ventil-Technologie)
Schmiersystem
Circulation oil (gear and rotary pumps)
power kw
1015
rpm
1000
fuel type
HFO/MDO
configuration
L
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Common failures & inspection points
Fuel injection pump plunger sticking at HFO 380: Missing heat storage in the pumps leads to insufficient fuel viscosity at low load (~10%) or
Connecting rod bearings (piston pin and big end bearing): Wärtsilä service letters document wear-dependent failure modes. Replacement required at wear limit
Cylinder liner wear and cross-cracks: Leakage at O-ring grooves, cracks in liner, blow-by require immediate action (piston + liner replacement). Class general
Turbocharger wear (VTR loader): Spent turbos increase SFOC, reduce max power. Wärtsilä offers performance upgrade (modern, more efficient loader,
Fuel injection pump bushing wear: Leakage from worn bushings + plungers reduces power. Replacement recommended at 12,000–16,000 h
Type-general inspection and maintenance points for this equipment category — not model-specific.
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Equipment Model #123072
· ✓ still in production