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Wärtsilä

7LW31-GS-50Hz

Wärtsilä 31 (W31) — Viertakt-Marinediesel, Bohrung 310 x Hub 430 mm, 720, 750 rpm, 4880–9760 kW (8V31–16V31 @ 750 rpm); 4700–9400 kW @ 720 rpm. Brennstoff: Diesel (HFO, MDO, LFO), Dual-Fuel LNG/Diesel (W31DF), Natural Gas (W31SG). Status: In production (2024–present). First introduced 2015. Over 1,000 MW installed globally and >1 million running hours logged.. Verifiziert, Datenblatt verlinkt.

2065.0 kW
Power

Engine Specifications

7
Cylinders
310 mm
Bore
430 mm
Stroke
4-stroke
Stroke Type

Components & Design

Component data being added…

Technical Data

Cylinder power 610 kW/cyl (diesel)
Mean effective pressure (BMEP) 30 bar
SFOC (diesel) 167.7 g/kWh (optimal point)
Weight (8V31) ~57.1 tonnes (dry, diesel)
Weight (16V31) ~89–92.5 tonnes (dry, diesel)
Piston speed 10.75 m/s
Turbocharging Two-stage turbocharging with intercooling
Fuel injection Common rail direct injection
Valve layout 2 inlet, 2 exhaust valves per cylinder
power kw 2065
rpm 750
fuel type HFO/MDO
configuration L
genset kw 1962
genset kva 2452
frequency hz 50

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Common failures & inspection points

Low-load operation: Poor combustion, carbon deposit accumulation in cylinders, turbocharger fouling, economizer fouling. Wärtsilä offers Slow Steaming Upgrade K
chiefengineerlog.com/2022/08/22/wha...
Cylinder liner wear and scuffing (general 4-stroke diesel pattern, not W31-specific): Exacerbated by inadequate lubrication oil film, excessive cylinder tempera
www.marineinsight.com/main-engine/m...
Fuel injection system: Common rail system generally robust; however, HP fuel pump overhaul intervals are extended to 24,000 hrs (vs. 12,000 in prior-gen engines
www.wartsila.com/insights/article/c...
Scavenge space deposit accumulation and fire risk (class-wide diesel phenomenon): Carbonized lube oil and unburnt fuel residues accumulate in scavenge space. Ex
marinersspace.com/complete-guide-to...

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

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Equipment Model #124646 · ✓ still in production