Main Engine 4-Stroke · Main Engines (4-Stroke)
The Baudouin 12M26.3 is a 12‑cylinder, high‑speed four‑stroke diesel engine designed for main propulsion or as a genset, notable for its compact bore‑and‑stroke (150 mm) design and dual‑fuel capability (diesel/MGO).
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The Baudouin 12M26.3 marine propulsion engines provide exceptional power and reliability for passenger catamarans.
What our service work and the manufacturer documentation say about keeping this model running.
Service includes oil, filters, valve clearance, injector checks, cooling system and turbocharger inspection.
| Engine Oil & Filters | 250-500 operating hours or annually, whichever comes first |
|---|---|
| Fuel Filters (Primary/Secondary) | 250-500 operating hours or as indicated by differential pressure |
| Air Filters | 500-1000 operating hours or as indicated by restriction indicator |
| Valve Clearance Adjustment | 1000-2000 operating hours |
| Injector Inspection/Overhaul | 2000-4000 operating hours (depending on fuel quality and duty cycle) |
| Cooling System Flush & Inhibitor Renewal | 2000-4000 operating hours or every 2 years |
| Turbocharger Inspection & Cleaning | 2000-4000 operating hours |
| Turbocharger Overhaul | 8000-12000 operating hours |
| Major Overhaul (Top End) | 8000-12000 operating hours |
| Major Overhaul (Bottom End) | 15000-25000 operating hours |
| Cylinder Liner Wear (Max Ovality/Taper) | 0.09 - 0.15 mm (for 150mm bore) |
|---|---|
| Piston Ring End Gap (Wear Limit) | New gap + 50-100% (e.g., if new 0.4mm, wear limit 0.6-0.8mm) |
| Crankshaft Deflection (Max Deviation) | < 0.05 mm between adjacent main bearings |
| Valve Seat Recession (Max) | 0.2 - 0.3 mm from original position |
| Turbocharger Bearing Play (Axial) | 0.15 - 0.25 mm (manufacturer specific) |
| Turbocharger Bearing Play (Radial) | 0.25 - 0.40 mm (manufacturer specific) |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Class surveyors will typically focus on the overall condition and operational integrity of the engine and its associated systems. Key checks include: verification of engine room cleanliness and fire safety arrangements (e.g., insulation, fire dampers, emergency stops); functional testing of engine safety devices (overspeed trip, low oil pressure alarm/shutdown, high coolant temperature alarm/shutdown); integrity of fuel oil supply and return lines, including shut-off valves and leak detection; exhaust system integrity (no leaks, proper insulation); condition of engine mounts and vibration levels; review of engine logbook entries, maintenance records, and oil analysis reports; and general observation of engine performance during a brief operational test (e.g., starting, idling, load response).
Estimated lifetime: 15,000 - 25,000 hours before first major overhaul (depending on maintenance and operating conditions)
Keep filters, injectors, belts, sensors, water pump kit and turbocharger parts.
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