Main Engine 4-Stroke · Main Engines (4-Stroke)
The Daihatsu 6DK‑20e is a vertical water‑cooled, direct‑injection 4‑stroke diesel auxiliary engine delivering up to 1 200 kW at 900 rpm, equipped with an electronic governor and capable of running on HFO or MDO.
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| Lube oil analysis | typically every 500 running hours |
|---|---|
| Fuel injector overhaul | typically every 4,000-8,000 running hours depending on fuel quality |
| Turbocharger water-wash | condition-based, commonly every 1,000-2,000 running hours, with full overhaul at a longer interval - confirm exact figures against Daihatsu's manual for the DK series |
| Top overhaul (piston/liner/valve inspection) | typically every 8,000-12,000 running hours |
| Cooling water treatment check | monthly or per the maker's chemical treatment schedule |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Piston ring gap | typically 0.8-1.5 mm depending on ring position for this bore class - confirm against Daihatsu's own manual |
|---|---|
| Main/big-end bearing clearance | typically in the region of 0.15-0.35 mm for an engine this size when renewal is due - confirm against the maker's manual |
| Cylinder liner bore wear | monitor closely and plan renewal as wear approaches roughly 0.3-0.5% of bore diameter (on a 200 mm bore this is on the order of 0.6-1.0 mm) - confirm against Daihatsu's actual limit |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Auxiliary generator engines have their governor and protective trips (overspeed, low lube oil pressure) function-tested at survey, crankcase explosion relief valves checked, generator insulation resistance tested, and parallel/load-sharing operation demonstrated; oil analysis and overhaul records are reviewed.
Estimated lifetime: Top overhaul intervals commonly fall in the 8,000-12,000 running-hour range, with a major overhaul/TBO commonly in the 24,000-32,000 running-hour range - treat as planning figures and confirm against the current Daihatsu DK-series manual and the engine's own maintenance history.
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