Main Engine 4-Stroke · Main Engines (4-Stroke)
The Daihatsu 5DK-20 is a vertical, water‑cooled, direct‑injection 4‑stroke diesel engine delivering 925 kW at 900 rpm, designed primarily for shipboard auxiliary power generation with dual fuel capability (HFO/MDO).
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| Valve clearance check | per maker manual, typically every 2,000 running hours |
|---|---|
| Injector service | typically every 4,000-6,000 running hours |
| Turbocharger inspection/overhaul | typically every 8,000-12,000 running hours |
| Lube oil analysis | every 250-500 running hours or per PMS |
| Piston/liner inspection | typically every 8,000-12,000 running hours per the maker's scheme |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner bore wear | typically up to about 0.3-0.4% of nominal bore for this class before renewal is considered - confirm against the engine's own manual |
|---|---|
| Piston ring gap | typically 0.6-1.2 mm for this bore class - confirm against the engine's own manual |
| Main bearing clearance | typically 0.10-0.25 mm depending on journal size - confirm against the maker's tolerance table |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Generator engines are typically surveyed under Continuous Machinery Survey or at periodic renewal survey; class reviews running hours against the maker's maintenance scheme and any open overdue maintenance items. Insulation resistance and protective device testing on the connected generator is usually checked alongside the engine.
Estimated lifetime: Auxiliary generator engines of this class typically achieve 80,000-120,000+ running hours between major overhauls with proper maintenance; actual life depends on load factor and maintenance history.
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