Main Engine 4-Stroke · Main Engines (4-Stroke)
This marine equipment belongs to the category of high-efficiency diesel engines. The Wärtsilä 8V31 is a prominent model in this class, designed for optimal performance and reliability. With a maximum continuous rating (MCR) of 4480 kW at 750 rpm, it is engineered to deliver efficient power output, boasting a specific fuel consumption (SFOC) of 165 g/kWh. The engine features a modular design that allows for flexible configurations, including dual-fuel capabilities with HFO, MDO, and LNG as fuel options. Its notable technical features include two-stage turbocharging with intercooling and common rail fuel injection, which contribute to its high efficiency. The engine is compliant with IMO Tier II emissions standards and has a bore of 310 mm and a stroke of 430 mm. Despite its robust design, common issues such as carbon deposit accumulation in cylinders and crankcase oil mist build-up may occur during low-load operations, though Wärtsilä provides upgrades to mitigate these issues.
Photos, drawings and page previews from this model’s datasheet or catalog.
“Service Agreement with fixed prices for everything from maintenance planning to availability of spare parts and manpower, and from technical support to training, enables excellent financial…”
| Lube oil analysis | every 500 hours or per maker's schedule |
|---|---|
| Valve clearance adjustment | typically every 2,000-4,000 hours |
| Fuel injection equipment overhaul | typically every 8,000-12,000 hours, duty dependent |
| Turbocharger overhaul | typically every 12,000-18,000 hours or per maker's schedule |
| Piston and liner inspection | per the Wartsila maintenance schedule, condition and running-hour based |
| Major overhaul | per the Wartsila 31-series maintenance manual, engine-hours and load-profile dependent |
| Cylinder liner wear | typically a few tenths of a millimetre per 1,000 running hours for engines this size, with the condemning limit set in Wartsila's manual - do not apply a generic figure without confirming |
|---|---|
| Big-end and main bearing clearance | wear limits are load and bearing-material specific; confirm against the Wartsila 31 maintenance manual rather than a fixed figure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class typically reviews crankshaft deflection trends, oil analysis records and completed condition-based maintenance items under Continuous Survey Machinery; the Wartsila 31 is commonly approved for extended overhaul intervals subject to condition monitoring being documented.
Estimated lifetime: This engine class is generally designed toward major overhaul intervals in the order of 24,000-32,000 running hours, strongly dependent on load factor and fuel or lube oil quality - confirm against Wartsila's maintenance schedule
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