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d3kOS displays live engine data from your NMEA 2000 bus. Here is what each sensor reading means and what to watch for.
Engine RPM. Revolutions per minute. Idle is typically 650–800 RPM for most inboard diesels. Wide-open throttle depends on your engine spec — check your engine manual for maximum rated RPM. Consistently running above rated RPM damages the engine. Consistently running below normal idle suggests a fuel or air delivery issue.
Coolant temperature. Normal operating temperature for most marine diesels is 160°F to 185°F (71°C to 85°C). Above 200°F (93°C) is a warning. Above 220°F (104°C) — shut down the engine immediately. Overheating is most commonly caused by a failed raw water impeller, blocked sea strainer, or thermostat failure.
Oil pressure. At operating temperature and normal RPM, most marine diesels run between 40 and 60 PSI. Below 20 PSI at operating RPM is a critical warning — shut down. Oil pressure is near zero at idle and rises with RPM; this is normal.
Alternator / battery voltage. With the engine running and alternator charging, you should see 13.5 to 14.8V on a 12V system. Below 13V with the engine running suggests the alternator is not charging. Below 12V with the engine off and no loads is a low battery warning.
d3kOS AI Engine Diagnostic (T2/T3). The AI Engine Diagnostic feature reads these values over time and generates a plain-English health report. It identifies trends — gradual coolant temperature rise, declining oil pressure — before they become failures.
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