Auxiliary Engine (Generator Set) · Auxiliary Engines
Engineered to stand the test of time, the Daihatsu 6DE(M)-20(F)(L) is a testament to reliability and durability in maritime propulsion systems. With a robust power output of 720 kW, this engine delivers consistent performance that vessel operators can depend on, even in the most demanding conditions at sea. The design emphasizes ease of maintenance, ensuring that downtime is minimized and operational efficiency is maximized. Whether powering commercial fishing trawlers or large workboats, the Daihatsu 6DE(M)-20(F)(L) provides a powerful and reliable solution that meets the rigorous demands of modern maritime operations. Its robust construction and high power output make it an ideal choice for vessel owners and operators who require a dependable engine that can handle heavy loads and long operating hours without compromising on performance. Trust Daihatsu to deliver the power and reliability you need to keep your vessels running smoothly, day in and day out.
Every value below comes from the manufacturer datasheet or class-society record on file for this model.
What our service work and the manufacturer documentation say about keeping this model running.
Servicing per the manufacturer's manual and classification society requirements. Annual inspection at class survey. Stock spare parts as specified by the manufacturer.
| Daily | Engine room rounds, visual checks, lube oil level check. |
|---|---|
| 250-500 operating hours | Lube oil change, lube oil filter replacement. |
| 500-1000 operating hours | Fuel filter replacement (primary & secondary), air filter cleaning/replacement. |
| 1000-2000 operating hours | Fuel injector overhaul (nozzle tips, cleaning, pressure test), valve clearance adjustment. |
| 4000-6000 operating hours | Cylinder head overhaul (valves, seats, springs, guides), turbocharger inspection/overhaul (bearings, cleaning), fuel injection pump inspection. |
| 8000-12000 operating hours | Piston and connecting rod inspection/overhaul (piston rings, connecting rod bearings), main bearing inspection. |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder Liner Wear | Max 0.6 - 0.8 mm increase in diameter at the top ring reversal point. |
|---|---|
| Piston Ring Groove Wear | Max 0.15 - 0.20 mm increase in axial clearance for the top compression ring. |
| Crankshaft Main Bearing Clearance | Max 0.15 - 0.20 mm (check against specific manufacturer data for exact values). |
| Connecting Rod Bearing Clearance | Max 0.12 - 0.18 mm (check against specific manufacturer data). |
| Valve Seat Recession | Max 0.8 - 1.0 mm from the original valve seat position. |
| Fuel Injector Opening Pressure | +/- 5-10 bar from the nominal setting (e.g., if nominal is 300 bar, acceptable range 290-310 bar). |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
During annual or periodical DNV surveys, the inspector will typically check: 1. General Condition: Overall cleanliness, absence of leaks (fuel, lube oil, water, exhaust), and secure fastening of all components. 2. Safety Devices: Verification of overspeed trip, low lube oil pressure shutdown, high cooling water temperature shutdown, and emergency stop functionality. 3. Governor System: Assessment of governor operation, stability, and response to load changes. 4. Fuel System Integrity: Inspection for leaks, proper shielding of high-pressure fuel lines (spray protection), and overall fire hazard mitigation. 5. Exhaust System: Integrity of the exhaust manifold, bellows, and silencer; absence of exhaust gas leaks. 6. Starting System: Functionality of the air start system (if applicable) or electric start, including air receiver pressure/battery condition. 7. Monitoring & Alarms: Verification that all critical engine parameters (pressures, temperatures, speed) are monitored and that associated alarms function correctly. 8. Maintenance Records: Review of engine logbook, maintenance records, and spare parts inventory to ensure compliance with manufacturer's recommendations and class requirements. 9. Operational Test: Witnessing engine start-up, stable running, and load acceptance to confirm satisfactory performance.
Estimated lifetime: 12,000 - 18,000 hours before major overhaul (e.g., piston/liner renewal, main/con-rod bearing renewal). Total engine life can exceed 50,000 hours with proper maintenance and successive overhauls.
Spare parts via Daihatsu Diesel Mfg. Co., Ltd. Moriyama Division or authorised distribution partners. Lead time: 2-6 weeks.
Listed in the DNV Approval Finder at the time we recorded it. The certificate is issued by DNV, not by us; check its current status at DNV.
Free of charge — send us your request for Daihatsu equipment. Our team checks it and replies by e-mail.
Other models of the same equipment type, Daihatsu first.
Tell us what you need for this Daihatsu 6DE(M)-20(F)(L) — a part, a service call, a second opinion. Are you Daihatsu? Claim this brand page.
Service engineer? Write the day report for this 6DE(M)-20(F)(L) in OceanSphere Work — photos, hours and parts, as a PDF for the owner. Try it free for 14 days →
Yes. Specifications, documents and service notes for this model are readable without an account. An account adds saved searches and requests, nothing is taken away.
Yes. Tell us the manufacturer, the model and what you need — a person reads every request and replies by e-mail.
Send us the nameplate or the correct value. We check it against the manufacturer datasheet or class-society record and update the page.