Main Engine 4-Stroke · Main Engines (4-Stroke)
The Daihatsu 5LDK‑20 is a 5‑cylinder vertical water‑cooled direct‑injection diesel engine delivering up to 925 kW at 900 rpm, capable of running on both marine diesel oil (MDO) and heavy fuel oil (HFO).
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| Lube oil sample analysis | monthly |
|---|---|
| Lube oil and filter change | per maker specification and oil analysis trend |
| Fuel injector overhaul | every 4,000-6,000 running hours |
| Piston/liner inspection (top overhaul) | every 8,000-10,000 running hours |
| Main/big-end bearing inspection | every 10,000-14,000 running hours |
| Turbocharger overhaul | every 6,000-10,000 running hours, per maker interval |
| Cylinder liner wear | commonly limited to roughly 0.3-0.5% of bore diameter for this class of medium-speed trunk piston engine before renewal is considered - confirm the exact figure against Daihatsu's DK-20 manual |
|---|---|
| Piston ring end gap | wear limit is maker-specific for this bore/stroke - confirm against Daihatsu's manual rather than a generic figure |
| Main/big-end bearing clearance | typically a few tenths of a millimetre depending on journal size - confirm against the maker manual before condemning a bearing |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Main propulsion engines are Continuous Survey Machinery items; class attends crankshaft deflection readings, bearing clearance records and governor/overspeed trip tests at survey, with running hours since major overhaul reviewed where the vessel is enrolled in a Continuous Machinery Survey scheme.
Estimated lifetime: Medium-speed trunk piston engines of this smaller bore class typically run to a major overhaul in the 20,000-28,000 running hour range, with overall engine life exceeding 80,000-100,000 hours through successive parts renewal - typical for this engine family.
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