Main Engine 4-Stroke · Main Engines (4-Stroke)
The Daihatsu 6DK-28 is a medium-speed trunk piston marine diesel engine designed for heavy-duty applications. This engine, part of the DK-28 family, boasts a six-cylinder, L-configuration design with a bore of 280 mm and a stroke of 390 mm. Operating at 720 rpm, it delivers a power output of 2400 kW, fueled by HFO or MGO. The engine adheres to IMO Tier II/III emission standards and features a forced lubrication system with water-cooled exhaust manifolds. Specific fuel consumption ranges from 178 to 190 g/kWh, and the piston speed is 9.36 m/sec. Common maintenance issues include connecting rod bolts hitting the frame, ring groove wear requiring chromium plating, loosening of the fuel injection pump tappet adjustment screw, pulse absorber degradation, and crankshaft journal wear in high-service applications. Regular inspection and timely intervention can help mitigate these issues and ensure the engine's reliability and longevity.
Every value below comes from the manufacturer datasheet or class-society record on file for this model.
| 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 8,000-12,000 running hours |
| Main/big-end bearing inspection | every 12,000-16,000 running hours |
| Turbocharger overhaul | every 8,000-12,000 running hours, per maker interval |
| Cooling water treatment check | monthly |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| 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 manual |
|---|---|
| Piston ring end gap | wear limit typically in the low millimetres for this bore/stroke - confirm against Daihatsu's DK-28 manual rather than a generic figure |
| Main/big-end bearing clearance | typically in the range of 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 and oil analysis trends reviewed where the vessel is enrolled in a Continuous Machinery Survey scheme.
Estimated lifetime: Medium-speed trunk piston main engines of this class typically run to a major overhaul around 24,000-32,000 running hours with liner/piston renewal, with overall engine life exceeding 100,000 hours through successive parts renewal - typical for this engine family.
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