Main Engine 4-Stroke · Main Engines (4-Stroke)
The Daihatsu 8DK-20 is an eight‑cylinder, medium‑speed (720–900 rpm) vertical trunk‑piston diesel engine designed for auxiliary power generation on merchant vessels, capable of running on both HFO and MGO.
Do you have the manufacturer datasheet for this model? Send it with the enquiry form — we check it and name the source.
| Lube oil analysis | every 250-500 running hours |
|---|---|
| Fuel injector inspection/overhaul | typically 4,000-6,000 hours, shorter than main engine duty due to typical continuous genset running |
| Turbocharger inspection | typically 6,000-10,000 hours |
| Cylinder liner/piston overhaul | typically 12,000-18,000 hours, condition-based |
| Valve overhaul | typically 6,000-10,000 hours |
| Governor/load-sharing calibration check | typically annual or after any control system work |
Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.
| Cylinder liner wear (bore increase) | typically up to about 0.3-0.4% of nominal bore before renewal is considered - confirm against the engine manual |
|---|---|
| Piston ring gap | typically 0.6-1.2 mm for this bore class - confirm against maker's tables |
| Main bearing clearance | typically 0.10-0.25 mm depending on journal diameter - confirm against maker's tables |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Auxiliary engines this size are typically covered by the vessel's machinery survey scheme; where enrolled in Continuous Survey of Machinery, class will want running-hour logs, crankcase inspection records, and governor/overspeed trip test evidence, plus confirmation that load-sharing and blackout-recovery performance has been demonstrated.
Estimated lifetime: Medium-speed genset engines of this class are typically run to 60,000-90,000 hours between major overhauls when well maintained, though continuous-duty auxiliary generators often accumulate hours faster than main engines and may see shorter effective intervals - confirm against the maker's maintenance schedule for the specific duty profile.
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 8DK-20 — a part, a service call, a second opinion. Are you Daihatsu? Claim this brand page.
Service engineer? Write the day report for this 8DK-20 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.