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Author Topic:   Transom Mount Transducer on Montauk 170
Maximus posted 04-24-2006 08:47 PM ET (US)   Profile for Maximus   Send Email to Maximus  
I'd like to see some pictures of transducer mounting options on a Montauk 170. I will be installing a transducer shortly.

After searching, I think the best method described is to use a transom mounting plate constructed of 1/2 to 3/4 inch thick starboard. This minimizes the holes into the hull and provides an upgrade path.

From what I've found, directly below the starboard drain hole is the right spot. If you have pictures, please send them my way.

davej14 posted 04-24-2006 08:53 PM ET (US)     Profile for davej14  Send Email to davej14     
Just my opinion, but not much sticks to starboard. I worry that if it comes off at speed you are going to have one heck of a boomerang flying back into the boat. Be sure to secure the cable to the transom. If you seal the two small screws that are required for the transducer you won't have a problem without the starboard.
bsmotril posted 04-25-2006 10:00 AM ET (US)     Profile for bsmotril  Send Email to bsmotril     
You can bond starboard to gelcoat with 3m 5200, but only if you put some grooves on the back of the starboard to give the adhesive a mechanical bite. Dovetail grooves are best because the undercut edges hold the cured 5200 in place. I've done a couple of installations like this for transducers and they've lasted over 10 years, no problems or detachment.


nydealer posted 04-25-2006 10:11 AM ET (US)     Profile for nydealer  Send Email to nydealer     
I think Maximus is planning on screwing a Starboard block to the transom and then screwing the transducer to the Starboard. This is a good idea as you can change where the transducer is mounted without putting more holes in the transom. You will also be able to replace the Starboard plate and install a new one using the same holes. This is how ours is mounted as we change equipment on occasion.
Maximus posted 04-25-2006 10:40 AM ET (US)     Profile for Maximus  Send Email to Maximus     
I'd prefer no holes in the transom, but the transom plate was an option to minimize the number.

I think I'll try the 5200 method first, though.

bsmotril posted 04-25-2006 12:37 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
Search the discussion archives here for Starboard + Transducer + 5200 and you should get some good hits where this method was discussed in great detail a year or so ago. BillS
ivansfo posted 04-26-2006 01:38 PM ET (US)     Profile for ivansfo  Send Email to ivansfo     
Another way is to use 3/16" ABS plastic in addition to starboard. Fasten 3/16" the ABS plastic sheets (in white or black) to your piece of starbard with counter-sunk stainless steel screws. Then now you have a piece of starboard where one side is plastic. With the two pieces together, trim to the size you need. Then just glue the plastic side with 5200 to your transom.

I've been is buying 3/16" ABS plastic sheets from the scrap bins of my local Tap Plastic store.

Barney posted 04-26-2006 07:06 PM ET (US)     Profile for Barney  Send Email to Barney     
Hey Maximus, here is my photo, the transducer is on top of the transition and works great at all speeds:
jimh posted 04-26-2006 08:31 PM ET (US)     Profile for jimh  Send Email to jimh     
Barney--What sort of water do you boat in? It looks like you are about to launch that Whaler into a cup of coffee!
Barney posted 04-26-2006 08:42 PM ET (US)     Profile for Barney  Send Email to Barney     
jimh, That is "Bayou Bernard" after a lot of rain, you remember this photo right:

Photo from the same dock.

After a drought the sharks visit the area. After a rain bass visit the area. If you are skiing or fishing you have to know what water you are dealing with. Muddy is better less sharks, for skiing. Clear is better more trout for fishing. So confusing.<G> Jim

Maximus posted 04-26-2006 09:54 PM ET (US)     Profile for Maximus  Send Email to Maximus     
Thanks Barney, glad to see you and your whaler made it through the storms.
Knot at Work posted 04-28-2006 06:54 AM ET (US)     Profile for Knot at Work  Send Email to Knot at Work     
Damn I miss my Whaler!
Barney posted 04-28-2006 09:37 AM ET (US)     Profile for Barney  Send Email to Barney     
Knot, where is your transom photo? I copied it a long time ago for reference. Jim
Beaner posted 04-28-2006 09:43 AM ET (US)     Profile for Beaner  Send Email to Beaner     


I'll try to email you a photo of my transducer by tomorrow, but I can tell you its riged through the tunnel, through the bottom hole (under the tunnel opening) in the splashwell, and down the back of the boat in line with the splash well hole. Its a pretty clean rigging job that was done by the dealer.

divefan posted 06-12-2006 04:36 PM ET (US)     Profile for divefan  Send Email to divefan
Maximus posted 06-12-2006 05:27 PM ET (US)     Profile for Maximus  Send Email to Maximus     
I happy to report my transom mounted depth gauge installation was a success. I bit the bullet and drilled holes in the transom to mount the transducer.

My first high speed run with the transducer showed that I got accurate readings while underway.

FWIW, Divefan, I mounted the transducer further outboard, under the second drain hole.

Thanks for the help.

divefan posted 06-12-2006 06:33 PM ET (US)     Profile for divefan  Send Email to divefan     
Glad it worked out for you. I think either place is good. A few inches further outboard or so shouldn't make any difference. Drilling the holes shouldn't be any problem for you. Post a few pix so we can see your work.

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