Main Engine 4-Stroke · Main Engines (4-Stroke)
The Wärtsilä 34DF is a medium‑speed, four‑stroke dual‑fuel main engine capable of running on LNG, MDO, HFO or biofuels, delivering up to 500 kW per cylinder (8 000 kW total in the 16‑cylinder version) with intercooled turbocharging.
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What our service work and the manufacturer documentation say about keeping this model running.
Service schedule includes pilot fuel system, gas admission system and normal cylinder unit inspections.
| Pilot Injector Overhaul | 4,000 - 8,000 hours |
|---|---|
| Gas Admission Valve Overhaul | 4,000 - 8,000 hours |
| Cylinder Unit Top Overhaul (Piston, Liner, Valves) | 8,000 - 12,000 hours |
| Turbocharger Inspection | 4,000 hours |
| Turbocharger Overhaul | 12,000 - 16,000 hours |
| Major Overhaul (Bottom End, Crankshaft Inspection) | 24,000 - 36,000 hours |
| Cylinder Liner Wear (Max. Ovality/Taper) | 0.6 - 0.8 mm from nominal bore |
|---|---|
| Piston Ring Groove Wear (Max. Axial Clearance Increase) | 0.15 - 0.20 mm over new specification |
| Crankshaft Deflection (Max. between adjacent throws) | 0.05 - 0.08 mm |
| Main/Connecting Rod Bearing Clearances (Max. Increase) | 0.15 - 0.25 mm over new specification |
| Exhaust Valve Seat Recession (Max. from reference) | 0.8 - 1.2 mm |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors will rigorously check compliance with the IGF Code for LNG-fuelled vessels. Key areas include: verification of all safety systems (gas detection, ESD, ventilation, fire suppression) functionality; integrity and leak testing of the entire fuel gas supply system (FGSS) and engine gas lines; review of engine performance records (power, fuel consumption, exhaust temperatures, cylinder pressures) to ensure stable operation on all fuel types; inspection of maintenance records and spare parts inventory; crankshaft deflection measurements; spot checks of bearing clearances; and overall engine room cleanliness and condition. Special attention is given to the condition of exhaust valves and turbochargers, and the functionality of pilot fuel injection systems.
Estimated lifetime: 24,000 - 36,000 hours (before first major engine overhaul requiring full disassembly and bottom-end inspection)
Keep pilot injector kits, gas admission valve kits, exhaust valves, filters and electronic sensor spares.
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