Hello Bill, and all
I replaced my original DMI sounder a few years ago. It had a plastic sleeve bonded into the thru-hull hole so that the transducer itself could be removed when the boat was afloat. This was very well bonded in there. I made up a rig for removing it.
Picture 4370:
This is the rig: threaded rod with the following, shown in this image from top to bottom: nut & washer; a spacer (may not be needed), a piece of strong material wide enough to span thethru-hull hole and bored tgenerously to accept the threaded rod (this was a scrap of HDMP but could be anything); a short length of 4” did ABS pipe; another piece of strong material wide enough to span the hole (this happened to be scrap steel, again bored generously to accept the threaded rod), another washer and nut. (Note that this picture shows the rig upside down, compared to the way I used it as you can see in the other pics).
Picture 4367:
Assembled for the task, you can see what part of the rig remains outside the hull: the ABS pipe, and the bottom washer & nut.
Picture 4369:
Here you can see what it looks like inside the boat. The ‘strong piece’ seen here spans over the top of the bonded-in sleeve, which stood proud of the inside of the hull by a few inches.
By turning the bottom nut, it brings down the threaded rod. The top 'strong piece’ spanning top of the sleeve brings the sleeve down with it, breaking the bond (3M 5200 I believe in my case). The sleeve winds up mostly in the cavity of the ABS pipe, with very little remaining in the hull because the top of the sleeve is now flush to the inside of the hull. After removing the lower nut and sliding removing the ABS pipe, it was a simple task to simply grab the exposed sleeve and pull it out the rest of the way by hand.
I made this with ‘found materials’ from my shed, but any hardware store will have what you need for not much money.
Greg Silver
Misty Cat 2cC #121
St Peter’s, Cape Breton
Where the Ocean Meets the Inland Sea
This is a job well designed to turn the air blue and to teach others very colourful expressions.
Does anyone have a tip or trick to make this job easier than brute force applied to a cold chisel? (This is the latest advice I received from Steve at DMI…)
Thanks in advance,
Bill Baxter
Persistence NS30 #507
Penetang, ON |
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