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  Sonar Change, will old bracket work?

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Author Topic:   Sonar Change, will old bracket work?
66Sakonnet posted 06-22-2001 08:37 AM ET (US)   Profile for 66Sakonnet   Send Email to 66Sakonnet  
I'm moving from a Lowrance 1240 to a humminbird 100, I'm praying that the humminbird transducer will fit the bracket for the lowrance, has anyone made this change before that can offer some insight...


Whaletosh posted 06-22-2001 09:25 AM ET (US)     Profile for Whaletosh    
I haven't but you should be able to use at least one of the mounting hole. If the new backet covers the second hole, just fill it with 3M 5200. If not fill, clean it up good and then fill it with MarineTek or gelcoat repair.
triblet posted 06-22-2001 10:26 AM ET (US)     Profile for triblet  Send Email to triblet     
You will have a problem is the holes are
close, but not the same. The Humminbird has
three screws. It's assume that the Lowrance
does too, and you reuse one hole. That's
now five holes in a small area.

You may be able to install the Humminbird
bracket in the Lowrance holes by doing a l
little drilling or filing on the new bracket.
This would probably be better than making
fibreglas look like swiss cheese.

BTW, all the current Humminbirds seem to use
the same bracket. I upgraded from a real
cheap bird to the Wide Panorama 3D, and used
the same bracket.


Whaletosh posted 06-24-2001 07:56 AM ET (US)     Profile for Whaletosh    
another option is to get a small piece of 3/4" thick Starboard (marine grade plastic). Drill and countersink it so that you can re-use the holes currently in you transom. Then screw the new transudcer bracket to the Starboard using 3/4" SS screws.

You will need to seal the screws that hold the Starboard to the transom, but not the screws holding the transducer to the Starboard.

You will also need to pre-drill the Starboard for the mounting screws for the transducer, use a 9/64" or #23 drill for #10 screws. Do this before you permantantly mount the Starboard to the transom or make sure you don't drill deeper than 3/4"; you don't want to drill into the transom. that would negate the purpose of using the Starboard.

You can get Starboard at West Marine or Boat/US and other stores. Or if you measure waht you need I can send you a small piece, I have lots of scraps laying around. Let me know.

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