Hull Sensor?
Hull Sensor?
Guys I found a round, about 1 and a half inch diameter, thru hull that is constructed of bronze covered with a copper cap. It has DO NOT PAINT on it (it was painted) and a spot for a wire to connect on top (inside). What is it?
Calivanos
1964 31' Marinette Cabin
Twin V6 Vortecs, ZF Hurth Transmissions
Matagorda, Texas
1964 31' Marinette Cabin
Twin V6 Vortecs, ZF Hurth Transmissions
Matagorda, Texas
Re: Hull Sensor?
I'd like to tell you it's a Capac sensor for monitoring galvanic corrosion but your description doesn't match. Capac units (on the exterior/ hull side) have a plastic housing approx. 10" dia and stamped "Do Not Paint" with the sensor about 3" in dia in the center. The sensor is actually the part to be left paint-free, it doesn't matter whether the rest of the housing is coated. The sensor is made of a silver chloride material, not brass. If you can gently remove the paint with a thinner solution - no abrasion - a cloth rag is ok - you might see that it's not brass. On the inside, Capacs have a post to which the meter lead is attached.
If it is in reality a Capac my guess is that its condition indicates it's past its useful life judging from the way a PO treated it.
And as I think more about what you describe (bronze, 1 1/2" dia), it's more likely that it's the business end of a sonar unit. That's the size of the sonar (depth finder/fish finder) on my former M. I was, though, able to paint the sonar with a special water based paint (sold at West Marine and others) to keep the barnacles away.
Next time we get queries like this a picture is worth...a lot.
If it is in reality a Capac my guess is that its condition indicates it's past its useful life judging from the way a PO treated it.
And as I think more about what you describe (bronze, 1 1/2" dia), it's more likely that it's the business end of a sonar unit. That's the size of the sonar (depth finder/fish finder) on my former M. I was, though, able to paint the sonar with a special water based paint (sold at West Marine and others) to keep the barnacles away.
Next time we get queries like this a picture is worth...a lot.
-joel-
former owner 1988 '32 FB Sedan
Chesapeake Bay
twin 318 / 240 hp
Potomac MD
former owner 1988 '32 FB Sedan
Chesapeake Bay
twin 318 / 240 hp
Potomac MD
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Re: Hull Sensor?
DITTO Transducer
dave
dave
1987 Marinette 29 FB Sedan
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
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- Tin star
- Posts: 28
- Joined: Thu Sep 11, 2014 6:11 pm
Re: Hull Sensor?
On the older Marinettes the capac is about the size you describe. Mine is about 1 1/2 with do not paint on it. Trace the wire see where it leads
Re: Hull Sensor?
Here is a picture
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Calivanos
1964 31' Marinette Cabin
Twin V6 Vortecs, ZF Hurth Transmissions
Matagorda, Texas
1964 31' Marinette Cabin
Twin V6 Vortecs, ZF Hurth Transmissions
Matagorda, Texas
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- Tin star
- Posts: 83
- Joined: Wed Jul 16, 2014 3:52 am
Re: Hull Sensor?
I believe that is a thru hull temp probe.
1986 Sedan Flybridge
Twin 318 closed loop
" Little Martha"
Traverse City,Mi
Hydraulic Steering (both helms)
Autopilot (both helms)
Twin 318 closed loop
" Little Martha"
Traverse City,Mi
Hydraulic Steering (both helms)
Autopilot (both helms)
Re: Hull Sensor?
I am just now reinstalling exhausts, tanks, generator and am trying to zero in on wiring. This weekend I will chase down the one wire that was attached to the top. I want to say it has to be part of a Capac but maybe it is some kind of transducer.
Calivanos
1964 31' Marinette Cabin
Twin V6 Vortecs, ZF Hurth Transmissions
Matagorda, Texas
1964 31' Marinette Cabin
Twin V6 Vortecs, ZF Hurth Transmissions
Matagorda, Texas
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- Site Admin
- Posts: 410
- Joined: Sat Jul 12, 2014 6:18 am
- Location: Kentucky
Re: Hull Sensor?
The Cathode for the CAPAC is coated with Silver/Silver Chloride as a ref. Cathode. It is fragile and can be damaged easily by scratching etc. The pic. of the "Think" does not appear to be coated with it.
dave
dave
1987 Marinette 29 FB Sedan
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
Retired Boat Accident UL and USCG trained investigator
Retired USCG Captain
-
- Tin star
- Posts: 28
- Joined: Thu Sep 11, 2014 6:11 pm
Re: Hull Sensor?
Was the bottom sandblasted? That's exactly what my capac looks like
Re: Hull Sensor?
Yes sir it was sandblasted. In that case it should be connected to the galvanic isolator right?
Calivanos
1964 31' Marinette Cabin
Twin V6 Vortecs, ZF Hurth Transmissions
Matagorda, Texas
1964 31' Marinette Cabin
Twin V6 Vortecs, ZF Hurth Transmissions
Matagorda, Texas