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bdeliman
Last seen: 1 year 3 weeks ago
Joined: 8/24/15
Posts: 35
Replace depth transducer

Is it possible to remove the original depth transducer. The speed transducer comes out easily, but it isn't obvious, to me at least, if the depth transducer can be removed from it's housing. I'm updating the gauges. Has anyone done this, or should I just drill a new a new one.

Bill Deliman

Vivacious 2
1989 Catalina 36, Tall Rig, Wing Keel, m25xp
Atlantic Highlands, N.J.

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Bill Deliman

Vivacious 2
1989 Catalina 36, Tall Rig, Wing Keel, m25xp
Atlantic Highlands, N.J.
William Miller
Last seen: 1 month 15 hours ago
Joined: 10/4/08
Posts: 291

I just installed a airpath transducer that shoots thru the hull.It will connect to my Garmin 4208 chart plotter.Very easy to install and no hole in hull. It works very good and I still have my old depth finder 

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Bill Miller
S/V Lorraine
Pacific Northwest,Sound Sound
Grapeview,Wa
1990 Mk1

William Miller
Last seen: 1 month 15 hours ago
Joined: 10/4/08
Posts: 291

I just installed a airpath transducer that shoots thru the hull.It will connect to my Garmin 4208 chart plotter.Very easy to install and no hole in hull. It works very good and I still have my old depth finder 

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Bill Miller
S/V Lorraine
Pacific Northwest,Sound Sound
Grapeview,Wa
1990 Mk1

GaryB's picture
GaryB
Last seen: 6 days 2 hours ago
Joined: 10/26/08
Posts: 525

Bill,

You are correct that the knot meter transducer is sleeved and so you can take the unit out to clean. The depth sounder is not sleeved in most cases and to remove, the boat would be out of the water. You would need to back off the flanged nut, more than likely, use some heat to loosen (make it pliable) any sealant that was involved, and remove. Your choice about whether you drill a new location or use old. I prefer minimum holes in the hull, but must admit I have 2 depth transducers.

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Gary Bain
S/V "Gone With The Wind"
Catalina 36', Hull #: 1056, Year: 1990, Engine: M-35
Standard Rig
Moored: East Boothbay, Maine
Home: Auburn, Maine

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bakerha
Last seen: 1 month 4 days ago
Joined: 7/23/10
Posts: 267

Bill:  I have the same boat as you and replaced my old signet transducer as a first step to getting a more reliable depth sounder.  Mine would loose lock on the bottom at very awkward times so it had to get fixed. My old transducer was under the forward cabin floor and very difficult to access.  I enlarged the hole in the floor to get better access and that helped.  My old transducer was one piece as stated above and not easy to get out.  Heat, a pipe wrench and a lot of swearing seemed to help.  The old transducer was flush mount and the hole was to large for the new mushroom head design. So I had the hole glassed and I re-drilled it to fit.  HOWEVER - the new transducer did not fix my depth problem and in the meantime my chart-plotter also went dead.  Long story but I ended up with a Garmin Chart / sounder and a new tilted element Airmar transducer.  This new equipment works great - rock solid depth regardless of the bottom type. Picture is old transducer with hole cutout larger.

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Harold Baker
S/V Lucky Duck
Duncan Bay Boat Club
Cheboygan Michigan - Lake Huron
1989 C-36 mkI TR/WK M25XP

Catboat Willy's picture
Catboat Willy
Last seen: 9 hours 44 min ago
Joined: 12/22/14
Posts: 255

Harold; Exactly where is you depth transducer located? Reason I ask is that mine seems to be located UNDER the holding tank which would mean removing the holding tank to access it. When the time comes, I'm thinking that I would just leave the old one in place and find a new spot for the new depth transducer.

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Bill Dolan 1990 Catalina C-36 MKI - Hull #1041  'Williwaw'
Std. Rig, Walk Through, Wing Keel
M35, Oberdorfer Conversion,
Home Waters; Port Charlotte, FL
'You are never out of work if you own a boat'

 
William Miller
Last seen: 1 month 15 hours ago
Joined: 10/4/08
Posts: 291

I have a 1990 and mine is below the V berth just as you open the center door under the bed. Very easy to get to .Mine was not working as well as I would like so I put in a new one by aiirpath that hooked to my garmin 4208 by nema 2000 and it shoots thru the hull no holes to cut and it is on a different freq than my other one so now I have 2 and the new one works great

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Bill Miller
S/V Lorraine
Pacific Northwest,Sound Sound
Grapeview,Wa
1990 Mk1

William Miller
Last seen: 1 month 15 hours ago
Joined: 10/4/08
Posts: 291

One othe thing if you go with this unit the dead rise is 20 degrees

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Bill Miller
S/V Lorraine
Pacific Northwest,Sound Sound
Grapeview,Wa
1990 Mk1

Catboat Willy's picture
Catboat Willy
Last seen: 9 hours 44 min ago
Joined: 12/22/14
Posts: 255

Thanks Bill ! That is helpful.
Bill

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Bill Dolan 1990 Catalina C-36 MKI - Hull #1041  'Williwaw'
Std. Rig, Walk Through, Wing Keel
M35, Oberdorfer Conversion,
Home Waters; Port Charlotte, FL
'You are never out of work if you own a boat'

 
bakerha's picture
bakerha
Last seen: 1 month 4 days ago
Joined: 7/23/10
Posts: 267

Bill - my transducer is under the forward cabin sole - see picture.  Pretty easy to get to but the access hole had to be enlarged to get a wrench on it and my hand on the wrench at the same time.  I would be amazed if yours was under the black tank, but, I've seen stranger things on boats. I would be tempted to go the - leave that one alone and install one of the "shoot through the hull" ones like mentioned above.  I am very happy with the Airmar I have and it gives me full sounding (i.e. Fish Finder) capability with my Garmin chartplotter.  Make sure you match the transducer to the dead rise of the hull where you intend to mount it.  Also - on mine there was an arrow that I assumed pointed forward.  But very un-manly like I read the directions before I installed it - and the arrow points toward the keel line of the boat!

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Harold Baker
S/V Lucky Duck
Duncan Bay Boat Club
Cheboygan Michigan - Lake Huron
1989 C-36 mkI TR/WK M25XP

William Miller
Last seen: 1 month 15 hours ago
Joined: 10/4/08
Posts: 291

I was wrong when I said my transducer is airpath it is the same as Harolds a airmar

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Bill Miller
S/V Lorraine
Pacific Northwest,Sound Sound
Grapeview,Wa
1990 Mk1

glenhelton
Last seen: 6 months 3 weeks ago
Joined: 7/8/19
Posts: 1

For those of you who are using the Airmar shoot-thru-the-hull transducer, do you know which model you have?  And where exactly are you mounting it, right next to the original thru-hull one?

True Wind
Last seen: 16 hours 34 min ago
Joined: 7/15/12
Posts: 96

Here is my installation of transducers. One is a shoot through. The shoot through is a medium band CHIRP.
David

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2003 Catalina 36
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