depth sounder
Moderator: Jim Walsh
depth sounder
has anyone replaced the original thru hull transducer on a 28? what size is the hole?how hard is it to remove the old transducer?all answers &comments will be welcomed. thanks
Re: depth sounder
i just did this job on our 33. I think your hole size will depend on the actual transducer brand and model. Mine was an old Signet depth. I had a rather deep transducer that stuck out of the fairing block a good two inches. The new one is flush with the block. One reason I went with the Raymarine was because someone on the board suggested the hole size would be the same. That was true for the speedo, for which I only needed to build up some epoxy along the rim of the hole as the old transducer was flush, leaving a concave bevel. Here is the old speedo hole before filling the bevel with epoxy.
![Image](http://i183.photobucket.com/albums/x198/Pablodanic/IMAG0246.jpg)
Here is the old sounder hole after removing the through hull and teak fairing block.
![Image](http://i183.photobucket.com/albums/x198/Pablodanic/IMAG0245.jpg)
The old hole was about 1 1/2" and the new one, for a Raymarine St60+ was to be two inches. I needed a deep 2" hole saw. I drilled the hole, sanded the area for a new fairing block and dry fitted the new one and then sealed with 4200. Here is the new sounder transducer and the speedo below.
![Image](http://i183.photobucket.com/albums/x198/Pablodanic/IMAG0259.jpg)
Be sure to give yourself extra time for this job in case you need to do multiple epoxy build ups. I didn't need multiple layups but I didn't expect to fill the speedo hole, I probably could have gotten away with not filling it but a little voice in the back of my head told me to do it right. Don't forget to map out the wire runs too, if you have a wheel and binnacle check to see how much room you have for wires to go up the pedestal. Mine just fit through a PVC tube when I pulled through the old wires. I can add no more electronics there!
![Image](http://i183.photobucket.com/albums/x198/Pablodanic/IMAG0258.jpg)
She's in the water now and all is good. This weekend will be the test when I get back up to the boat.
![Image](http://i183.photobucket.com/albums/x198/Pablodanic/IMAG0246.jpg)
Here is the old sounder hole after removing the through hull and teak fairing block.
![Image](http://i183.photobucket.com/albums/x198/Pablodanic/IMAG0245.jpg)
The old hole was about 1 1/2" and the new one, for a Raymarine St60+ was to be two inches. I needed a deep 2" hole saw. I drilled the hole, sanded the area for a new fairing block and dry fitted the new one and then sealed with 4200. Here is the new sounder transducer and the speedo below.
![Image](http://i183.photobucket.com/albums/x198/Pablodanic/IMAG0259.jpg)
Be sure to give yourself extra time for this job in case you need to do multiple epoxy build ups. I didn't need multiple layups but I didn't expect to fill the speedo hole, I probably could have gotten away with not filling it but a little voice in the back of my head told me to do it right. Don't forget to map out the wire runs too, if you have a wheel and binnacle check to see how much room you have for wires to go up the pedestal. Mine just fit through a PVC tube when I pulled through the old wires. I can add no more electronics there!
![Image](http://i183.photobucket.com/albums/x198/Pablodanic/IMAG0258.jpg)
She's in the water now and all is good. This weekend will be the test when I get back up to the boat.
Paul
CDSOA Member
CDSOA Member