View Full Version : scew holes behind transducer mounting board
1shooter
08-09-2009, 04:29 PM
I am installing a transducing mounting board on my boat and am going to end up with 5 screw holes behind it that came from the speedometer and the old transducer.
What is the best way to deal with these? Can I just fill the holes with silicone and mount the board over them or do I need to put screws in them and make holes in the back of the board that line up in order to make it mount flush?
toolboy
08-09-2009, 04:49 PM
The best way to fix this is to use a marine silicone first, then put the screws in, then add silicone over the top before installing the board. This will make the hull as watertight as possible.
1shooter
08-09-2009, 05:31 PM
I understand that but was hoping there was an alterntive of putting the screws in....reason being is I will have to line them up with the back of the mounting board then bore it out so the plate will mount flush.
I understand that but was hoping there was an alterntive of putting the screws in....reason being is I will have to line them up with the back of the mounting board then bore it out so the plate will mount flush.
you can use flat head screws and turn them in til they are flush
fisher-1
08-09-2009, 08:13 PM
The best way to fix this is to use a marine silicone first, then put the screws in, then add silicone over the top before installing the board. This will make the hull as watertight as possible.
That is what I did, worked good.
I put a little marine adhesive on screw heads, pressed it against the board and that gave me the marks I needed to make the dimples for scew heads, I just used a sharp point of knife to gouge them out, a drill would work too. make sure you use below water marine grade adhesive like 3M 4200.
hiwayman
08-09-2009, 09:30 PM
I just siliconed the holes shut, mounted the board and ran a bead of silicone around the outside edge of the board. Owned that boat another ten years and never had an issue!
1shooter
08-10-2009, 09:03 AM
I just siliconed the holes shut, mounted the board and ran a bead of silicone around the outside edge of the board. Owned that boat another ten years and never had an issue!
Good to hear that just filling the holes with silicone and covering with the mounting plate worked for you. I was thinking of going that route but wasn't sure if it would work.
Hit the holes with a countersink bit the run a flat hd in to flush..silicone before and after
1shooter
08-12-2009, 09:45 PM
Thanks for the reply. I never thought about flat head screws.