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Engine hours are the marine equivalent of kilometres on a car odometer. They determine maintenance intervals for oil changes, impeller replacement, heat exchanger inspection, and injector service. d3kOS tracks engine hours automatically.
How d3kOS tracks hours. d3kOS reads engine RPM from the NMEA 2000 bus. When RPM is above idle (approximately 200 RPM), the engine is considered running. Hours accumulate in the local database and are displayed on the dashboard engine panel.
Maintenance intervals for typical marine diesel. Oil and filter: every 100 hours or annually. Raw water impeller: every 200–300 hours or annually. Fuel filters (primary and secondary): every 200–300 hours. Heat exchanger inspection: every 500 hours. Injector service: consult your engine manual, typically 1,000–1,500 hours.
Exporting engine hours. Engine hour data is stored in the Pi’s local database and can be accessed via the AI Engine Diagnostic report (T2/T3 feature). The report includes cumulative hours alongside the health analysis.
If your hours were not tracked from new. You can enter a starting hour value in d3kOS settings to match your engine’s existing hour meter. This ensures the maintenance reminders are based on accurate accumulated hours rather than hours since d3kOS was installed.
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