Main Engine 4-Stroke · Main Engines (4-Stroke)
In marine auxiliary applications, diesel engines are essential for providing reliable power and propulsion. The Daihatsu 6DE-18 is a robust 6-cylinder engine designed to operate on both Marine Diesel Oil (MDO) and Heavy Fuel Oil (HFO). With a bore of 185 mm and a stroke of 280 mm, this 4-stroke engine delivers maximum power outputs of 815 kWe at 900 rpm and 665 kWe at 750 rpm. The Daihatsu 6DE-18 is part of the current DE series, which is Tier 2 compliant, ensuring environmental standards are met. To maintain optimal performance, it is crucial to follow Daihatsu's maintenance plan, which includes regular inspections and cleaning of injectors, valves, coolers, and the turbocharger. Spare parts such as fuel injectors, exhaust valves, filters, gasket kits, and cooler seals should be kept on hand for timely replacements. Common issues, like the need for improved atomization in fuel injection nozzles and critical maintenance of fuel injection valves, are addressed in Daihatsu's service bulletins. The engine’s reliability is further enhanced by ensuring that vibration reinforcement is applied to the fuel main pipe and that high-pressure block mounting bolts are torqued to specific specifications.
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What our service work and the manufacturer documentation say about keeping this model running.
Follow Daihatsu maintenance plan for injectors, valves, coolers and turbocharger cleaning.
| Fuel Injectors (overhaul/replacement) | 3000-4000 hours |
|---|---|
| Exhaust Valves (inspection/grinding) | 6000-8000 hours |
| Turbocharger (cleaning) | 3000-4000 hours |
| Turbocharger (major overhaul) | 12000-16000 hours |
| Lube Oil Cooler (cleaning) | 3000-4000 hours |
| Piston Withdrawal (inspection/ring replacement) | 12000-16000 hours |
| Main & Connecting Rod Bearings (inspection) | 12000-16000 hours |
| Cylinder Head (overhaul) | 6000-8000 hours |
| Fuel Oil Filters (replacement) | 500-1000 hours |
| Lube Oil Filters (replacement) | 500-1000 hours |
| Cylinder Liner (max ovality/taper) | 0.6 - 0.8 mm (total) |
|---|---|
| Piston Ring Groove (max clearance) | 0.15 - 0.25 mm (over nominal) |
| Crankshaft Deflection (max) | 0.05 mm |
| Main Bearing Clearance (max over nominal) | 0.20 - 0.25 mm |
| Connecting Rod Bearing Clearance (max over nominal) | 0.15 - 0.20 mm |
| Exhaust Valve Seat Recession (max) | 1 mm |
| Turbocharger Rotor Axial Play (max) | 0.15 - 0.25 mm (refer to specific TC manual) |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on the engine's overall condition, maintenance records, and compliance with statutory requirements. Key checks include: verification of engine logbook entries (running hours, maintenance performed, fuel/lube oil consumption), inspection of safety devices (overspeed trip test, low lube oil pressure alarm/shutdown, high cooling water temperature alarm/shutdown), general visual inspection for leaks, corrosion, and cleanliness. They will check the integrity of high-pressure fuel oil piping and shielding, crankcase relief doors, and exhaust gas system insulation. Depending on the survey cycle (e.g., intermediate or special survey), they may require opening of specific components such as cylinder heads, pistons, or bearings for internal inspection, often based on running hours or condition monitoring data. Lube oil analysis reports and fuel oil bunkering records are also scrutinized.
Estimated lifetime: 60,000 - 80,000 hours before first major overhaul (e.g., crankshaft out inspection), with a total design life exceeding 150,000 hours with proper maintenance.
Keep fuel injectors, exhaust valves, filters, gasket kits and cooler seals.
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