where can I buy a bronze thru-hull for nasa log

M

MarkGrubb

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Hi All,

I have a Nasa Marine Target2 Log. I fitted it last year and when I lifted the boat out in October part of the thru hull had broken away. I suspect I should not have used sikaflex to bed it in as i subsequently read that it can make some plastics brittle and only silicon sealant should be used.

Anyway, I'd like to replace it with a metal thru-hull. Would Bronze be the best choice?

Does anyone know a supplier of bronze thru-hulls that are the correct size, thread etc. for the Nasa Target log impeller.

...and I'd be grateful for any tips on how to remove an impeller thru-hull that has been bedded with sikaflex.

Thanks,

Mark.
 
No problems with sikaflex. DONT use silicone.
If it split.. you applied too much force.

To remove it... remove the nut on the inside and hit it with a large hammer.. out of the water !!!.

Sikaflex is not a glue, its a bedding agent..

No worries..
 
There was a long running thread on this topic around 18months ago (maybe a little longer). Many have suffered separation of the external rim from the threaded part of the thru-hull. Unfortunately using the present Google based search I can't find the thread.

I don't believe the problem is with the sealant, but the method of manufacture of the fitting. I have mine (never fitted) and would not fit it.

You will find that a standard bronze (or DZP) threaded skin fitting is sufficiently close in size (maybe using very slightly thicker O-rings). All you need to do is grind/file off the two lugs usually provided to aid tightening, and shorten it to same length as the original. The thread of a standard fitting is the same as the NASA transducer cap.

(My problem is that the NASA transducer is too short for my hull thickness without modification, unlike my original Navico DS150).

Vic
 
Yes Vic, you are quite right, I was trying to find the tread as you must have been typing your reply. I described in that tread how a pal of mine had used a bronze fitting and cleaned out the rough internal finish to take the Nasa transducer. The problem was caused by people using the wrong sealer in the first place. If all else fails, read the instructions.

Ted
 
[ QUOTE ]

Sikaflex is not a glue, its a bedding agent..

No worries..

[/ QUOTE ]


Please tell that to my windows (and many other fittings on my boat) which I installed in the days when Sikaflex was something new to me but was regarded as 'the best thing to use'. Quite likely if you only keep the boat for a few years, but at 24 years occaisonally I want to remove something, and with the windows there is NO CHANCE without damage.

I now usually use silicone for above water bedding and polysulphide for below waterline, especially since usually working between tides.

There are various grades, but the common Sika is a polyurethane adhesive/sealant and this type is commonly used for permanent constructional purposes.

Vic
 
Found this in my PMs and can date it to 5/4/2005. Maybe someone knows how to locate the thread from this?

>>>>>>>>>>

Hi Vic in case you miss my post here are the details of the bronze fitting.

Aquafax bronze 1 1/4" skinfitting part no 2-70254 from your local or TCS Chandlery 01375 374702
you will need to clean up the interior bore so that it will accept the log and cut the threaded section down a bit . The fitting is around £18.00 +p&p
regards

Squidge

<<<<<<<<<<<<<


Vic
 
[ QUOTE ]
Found this in my PMs and can date it to 5/4/2005. Maybe someone knows how to locate the thread from this?


[/ QUOTE ]HERE?

I don't think this thread can be located in any way using the Google search, though obviously its still in the database.
 
Dont wish to be pedantic, but it depends on which sikaflex number you use as to whether it is an adhesive or a flexible sealer, but they all stick!
 
Yes, that thread was the follow-up on finding a bronze alternative thru-hull. The main thread about the problem with the original NASA fitting was a few days earlier. I remember it was one of those threads that ran to 30-50 posts.

Vic
 
There was THIS ONE a few days earlier. Again it seems to be invisible to Google.

We voted for the Google search on the grounds that it would find all threads in the database ... as it used to. Of course, having voted, something else is altered as well and we get shortchanged as per usual. So I don't see how they can complain about a little minor hacking on the database.
 
[ QUOTE ]
There was THIS ONE a few days earlier.

[/ QUOTE ]

Yes that was another 'offshoot' thread (same problem with thickness that I mentioned on a Sadler29). However the originating thread discussing the thru-hull failure was a bit earlier still.

What method are you using to search ?... the only way I can come up with is to repeatedly decrement the post number and see what comes out. Can get a bit tedious /forums/images/graemlins/frown.gif I guess if really determined a script could be written to do this and look within posts for a specific string .... but it would probably do nothing for the forum response time /forums/images/graemlins/grin.gif

Vic
 
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