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Replacing transducer #18851
07/18/21 09:20 PM
07/18/21 09:20 PM
Joined: Jun 2021
Posts: 9
Falmouth, MA
R
Ryan Anderson Offline OP
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Ryan Anderson  Offline OP
Forum Newbie
R
Joined: Jun 2021
Posts: 9
Falmouth, MA
Is there no balsa core where the head's seacock is? I'm going to replace a transducer that is in that area and want to know what I'm getting into. It seem that there is a square area where the inner skin dips down, my guess is there is no balsa core in this square?

If anyone has any tips on replacing the existing transducer that would be helpful. The new one will be the exact same diameter. It seems the biggest challenge is getting the old one out. I would like to avoid hammering it out, so I was thinking of cutting it up with a rotary tool.

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Re: Replacing transducer [Re: Ryan Anderson] #18852
07/18/21 10:33 PM
07/18/21 10:33 PM
Joined: May 2007
Posts: 2,635
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,635
Portsmouth, RI
That area should be without core. If the old transducer is scrap, drill through the center of it from the bottom to make a pilot hole, then use a circle cutter the diameter of the housing threads. The transducer and old housing will pull out easily from inside the boat. Clean up the area and bed the new transducer housing.

Re: Replacing transducer [Re: Ryan Anderson] #18853
07/19/21 07:15 AM
07/19/21 07:15 AM
Joined: Jun 2021
Posts: 9
Falmouth, MA
R
Ryan Anderson Offline OP
Forum Newbie
Ryan Anderson  Offline OP
Forum Newbie
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Joined: Jun 2021
Posts: 9
Falmouth, MA
Thanks Bill, that's useful information.

The old thru-hole is actually a speed sensor. I'll put in the plug and drill a pilot hole in that.

Any favorite bedding products? 4200?

A separate question, does the cockpit bulkhead have a core?

Re: Replacing transducer [Re: Ryan Anderson] #18854
07/19/21 07:44 AM
07/19/21 07:44 AM
Joined: May 2007
Posts: 2,635
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,635
Portsmouth, RI
You can use closed cell pipe foam with a wooden dowel in the center, then pushed in the insert to provide a place to drill the pilot hole. That is what I did.

Use Sikaflex-291 for bedding the insert. It is quick setting marine grade polyurethane and cleans up with mineral spirits.

The cockpit bulkhead is cored. If you drill to mount something there, be sure to properly epoxy isolate.

Re: Replacing transducer [Re: Rhapsody #348] #18868
08/04/21 06:55 PM
08/04/21 06:55 PM
Joined: Jun 2021
Posts: 9
Falmouth, MA
R
Ryan Anderson Offline OP
Forum Newbie
Ryan Anderson  Offline OP
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R
Joined: Jun 2021
Posts: 9
Falmouth, MA
The wooden dowel trick worked. I only drilled through the flange, then was able to rotate the old sensor out. It wasn't bedded with a permanent material.

Re: Replacing transducer [Re: Ryan Anderson] #18871
08/05/21 07:44 AM
08/05/21 07:44 AM
Joined: May 2007
Posts: 2,635
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,635
Portsmouth, RI
Ryan - what hull number do you have? You aren't shown on the boat list and I can fix that.

Re: Replacing transducer [Re: Rhapsody #348] #18872
08/05/21 10:47 AM
08/05/21 10:47 AM
Joined: Jun 2021
Posts: 9
Falmouth, MA
R
Ryan Anderson Offline OP
Forum Newbie
Ryan Anderson  Offline OP
Forum Newbie
R
Joined: Jun 2021
Posts: 9
Falmouth, MA
456, I recently purchased her from Bill. Haven't changed the name, you can put me down for MA for state.

Re: Replacing transducer [Re: Ryan Anderson] #18874
08/06/21 09:28 AM
08/06/21 09:28 AM
Joined: May 2007
Posts: 2,635
Portsmouth, RI
Rhapsody #348 Offline
Past J/30 Class President
Rhapsody #348  Offline
Past J/30 Class President
Joined: May 2007
Posts: 2,635
Portsmouth, RI
Got it - That explains why I haven't seen Bill out on Tuesday nights. Dave Erwin is fixing the database SW and as soon as he does, I'll make the update.

Re: Replacing transducer [Re: Ryan Anderson] #18889
08/21/21 10:28 AM
08/21/21 10:28 AM
Joined: Jun 2000
Posts: 129
Melbourne, FL, USA
Rob Van Name Offline
Senior Member
Rob Van Name  Offline
Senior Member
Joined: Jun 2000
Posts: 129
Melbourne, FL, USA
What kind of transducer?
If it is depth just silicon it to the center area under the vee berth.

Re: Replacing transducer [Re: Ryan Anderson] #18891
08/22/21 11:27 AM
08/22/21 11:27 AM
Joined: Jun 2021
Posts: 9
Falmouth, MA
R
Ryan Anderson Offline OP
Forum Newbie
Ryan Anderson  Offline OP
Forum Newbie
R
Joined: Jun 2021
Posts: 9
Falmouth, MA
It has a paddle wheel for water speed so had to be thru-hull mounted. The job ended up being pretty straight forward.


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