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Old 03-10-2015, 20:43   #31
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Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 2,528
Re: Raw Water flow sensor switch alarm

Quite happy with my engine watchdog TM 4. Probably an expensive way to do it, but it monitors engine head temp, exhaust elbow temp, and has user settable alarms that can be run just above the running temps. In my case it's been a good solution so far, and it's very nice to be able to look at the actual digital temp readouts as the engine warms up.

It was very easy to install, just hoseclamped one sensor onto the outside of the exhaust elbow, and the other bolted into the lifting lug on the head.
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Old 04-10-2015, 16:15   #32
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Join Date: Oct 2010
Location: The boat - New Bern, NC, USA; Us - Kingsport, TN, USA
Boat: 1988 Pacific Seacraft 34
Posts: 309
Re: Raw Water flow sensor switch alarm

I got AutoSketch running on an older Vista computer...

This is my wiring diagram for the engine wiring on my Yanmar 3HM35F. Sorry it is not of a better resolution, but AutoSketch 7 does not let me choose the pixel count when it converts SKF files to JPEGs. Down at the lower right you can find the Alarm Horn. It has one 12v+ connection and three 0v connections each with an internal diode which is not shown. If you follow the wires around, you will see that if any one (or more) of the Coolant Temp Switch, the Exhaust Temp Switch, or the Temperature Light and Horn Test switch grounds the W/Bl wire at the Alarm Horn, the horn will sound and the Temperature light will light. This is all as Wotname suggested.

Another thing I have done to monitor the raw water flow rate is to record in the boat's log the length of time necessary to collect a full 2-1/2 gallon bucket of water discharged from the exhaust with the engine running at 2000 rpm when everything was working well. Knowing that number, I've been able to fairly quickly identify engine overheating problems caused at different times by (1) the end of the pencil zinc that protects the refrigeration condenser corroding free of the fitting and plugging the raw water cooling hose, (2) a small family of barnacles building their new homes in my raw water intake thru hull fitting, and (3) several of the raw water pump impeller ends breaking off with one of them lodging in the raw water pump outlet pipe.

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Old 04-10-2015, 16:40   #33
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Posts: 316
Re: Raw Water flow sensor switch alarm

Could never immagine wanting water in the cockpit. Many times I bring a big blanket into the cockpit on night watch. Dropping it, and it being wet would be very bad.

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alarm, raw water, water

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