Stopping a run-away Yanmar 3JH4 Engine

[Webmaster] Yes, there is an emergency shutdown for a 3JH4 Engine.

Emergency Shutdown JH4E


I had an incident yesterday afternoon that stumped me for awhile, and concerned me too.  As some background I had wired in a warning light at the helm to alert me when the Racor filter is filing with water.  Since completing this project last week, I had not had an opportunity to use the engine.

Yesterday, I wanted to run the engine for a bit and maybe finally take Alderu out for a day cruise.  I placed the key in the ignition (and possibly turned it, not sure) and the engine just came right on.  No hitting any start buttons, nothing, just key in and RUN.  At first I didn’t even comprehend what was going on, but realized that the Yanmar was running.  None of the instruments were alive; the tach, temp, fuel gauge, etc, all dead. But

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