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rand49er 06-29-2013 10:32 AM

Want best way to get water temp from water intake fitting
Just bought a Faria depth sounder with air and water temp displays and, to avoid drilling through the hull/transom, I plan to mount the sounder in the bilge and get the lake water temperature from the engine cooling water intake fitting or hose. I did a search and found someone who's done this, but he hasn't responded to my PM.

I've casually looked at the fitting mounted on the floor of the bilge and DO NOT want to screw up this install. Ques: Has anyone else done this? Can you describe how you did it without creating a leak? Would cutting the hose and inserting a rigid segment (with the temp sensor epoxied in) be a sound approach?

Thanks, everyone!

mikeg205 06-29-2013 10:51 AM

That should work - rigid piece on hose... people put raw water strainers there.

rand49er 06-29-2013 11:01 AM

Good to know that "my idea" has actually been done before, Mike. Cut the hose an inch or so after the intake fitting, epoxy the sensor through a hole and into the side of the rigid segment, then insert the segment into either end of the freshly cut hose, and securely clamp it on both ends. Voila!

Dynamite Spike 06-29-2013 02:32 PM

Interesting to read this thread today as I am in the process of doing exactly the same thing.
I bought a digital temp meter (battery operated) on eBay which I will install in the dash. (The display is showing L because I cut the wire to the thermocouple)

We have aluminum adapters at work which are specifically designed for repairing automotive water hoses. We use them to make prototype hose assemblies.

I then drilled a hole in the adapter and used JB Weld to epoxy the temp sensor in. It's not pretty but is water tight.

Had some help from my boy too

I plan on continuing with the installation tonight. The positioning of the adapter in the raw water inlet hose is critical. It needs to be above the waterline in case of a leak...but not too close to the trans oil cooler.

thatsmrmastercraft 06-29-2013 04:54 PM

Very cool project. One more thing to add to the To Do List......

Dynamite Spike 07-02-2013 06:02 PM

I completed my lake temp meter install today. Haven't been in the water yet but it's reading the air temp accurately. It took me a while to decide on a location for the display. Initially I wanted to to install it in the dash but there wasn't any available space. I was looking for a position that would be readable from most parts of the boat ( except the bow of course) and finally settled on putting it next to the clock near the glove box. This meant I had to cut a hole in the fiberglass but I'm pretty happy with the result.

mikeg205 07-02-2013 07:30 PM


Originally Posted by thatsmrmastercraft (Post 952388)
Very cool project. One more thing to add to the To Do List......

oh cripe... +1 - looks like the employee is very satisfied too ;)

rand49er 07-03-2013 09:21 AM

Looks good, Dynamite Spike!

I collected a few items (clamps, silicone, etc) yesterday and hope to launch into mine today. Bought a new length of intake hose (1-1/4" ID) so I could retain the original one intact just in case. I didn't measure accurately so just estimated that three feet would be enough. Darn stuff cost $0.92 per inch! I will post pics maybe by this weekend.

Barefooter92 07-04-2013 10:49 PM

Sorry, I was MIA for a few days...

Yours looks great and pretty much the same way I did mine.

rand49er 07-07-2013 08:33 AM

Just to complete my thoughts here, I took some rather poor photos of my finished product. It took several hours spread over several days to complete this project mainly because I didn't have all the necessary items. If I had to do this a second time, it would take MAYBE two hours not including JB Weld and silicone drying time. Such it is with many of these kinds of projects.

This is the "T" fitting in the water intake hose used to read the water temp. I removed the "mounting wings" from the sensor itself using a hacksaw and used JB Weld to adhere it to the inside wall where the water flows past it.

You can just see the transducer itself mounted on the bilge floor just to the port side and forward slightly of the drain hole.

I removed this floor panel (after removing the captain's seat) to gain better access to the floor of the bilge to mount the transducer. The floor there is very smooth and only needed to be cleaned a bit to provide an excellent mounting location and application of the silicone.

I removed the bulkhead panel under the helm and after purchasing a wire "fishing" tool at Lowe's for $11 and running the water temp wire and the transducer wire through the hull passage where the other wires and steering cable run, I removed the two screws holding the wood-grained panel holding the clock and the fuel gauge then removed the clock and wired in the Faria gauge. This photo was taken while still on the hoist and under the canopy so lighting is not the best nor is the focus.

Took the boat for a ride to check for leaking (there wasn't any), and it worked just fine. Hooray!

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