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Old 30-10-2014, 14:09   #1
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Yanmar seal alarm fault

We have recently had the seal alarm go off, I have removed the sensor and it all looks dry inside. I replace the sensor and the alarm went away, now then the alarm came back, once again I inspected the sensor, all clean no water. The alarm has stopped for now, just wondering if anyone else has experienced this?
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Old 31-10-2014, 01:07   #2
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Re: Yanmar seal alarm fault

Check your wiring for a ground. I had an alarm go off for oil pressure, but I have gauges as well and knew it was false. It would quit and then while heavy motoring it would come on again. I found the sensor wire rubbing against a sharp metal edge. And the smoother action of the motor at higher RPMs allowed the wire to settle on the metal.
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Old 31-10-2014, 06:29   #3
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Re: Yanmar seal alarm fault

False alarms on the Yanmar saildrive seal sensor are quite common. Usually, removing it, drying, and replacing solves it for a while.

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Old 31-10-2014, 07:10   #4
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Re: Yanmar seal alarm fault

I would have thought ground fault as it did go away at different RPM, but would then come back. It does go away for a while when I remove sensor and reinstall. Just a nuisance when I get underway early in the morning and trying not to wake everyone up of course there is no way to mute the alarm other than switching engine off.
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Old 31-10-2014, 08:34   #5
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Re: Yanmar seal alarm fault

Mine just did this also (less than 50 hours on new seals). I unplugged the connection. Adding a switch is on my list - that alarm is LOUD!!!
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Old 02-11-2014, 06:32   #6
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Re: Yanmar seal alarm fault

Happened to me on my non saildrive boat. Discovered that a wire from the saildrive plug was pinched under my forward port motor mount, it took 20 years to chafe through and make a contact.
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Old 02-11-2014, 23:22   #7
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Re: Yanmar fuel alarm fault

Same issue here, new Yanmar 75 hp and daily we get a "water in fuel filter"
No end of searching reveals any water in fuel supply.

Might try disconnecting enjoying alarm Anybody any experience??
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