I removed my Datamarine speed transducer last spring. I spent probably 3 hours trying every non-destructive method I could think of before I had to move to destructive methods. Should have done so earlier since I didn't need to save it anyway (was replacing with an Airmar / Raymarine triducer).
Note - I'm assuming you actually have removed the transponder, and the *thru-hull sleeve* is what you're trying to remove. The transponder (transducer) should be relatively easy to remove from the thru-hull sleeve with some wiggling or heating. My thruhull looked like it was bedded with something more pliable/spongy than 5200, but mallets, heat, levers, and pulling were not enough to budge it. I also had the plywood backing plate glued to the hull. It was not threaded / tapped. I discovered the easy way is to cut the thruhull in half, lengthwise along the inner circumference, with a hacksaw blade. I just used the blade alone clamped in some vice grips. By cutting the plastic thruhull in half you weaken the outward pressure of the circle and enable basically peeling each half away from the hull. Be careful not to cut too deep or you'll nick the hull fiberglass. I have pictures if you need them. @ Steve Thomas: The Datamarine speed transducer in my experience was exactly the same diameter as the Airmar transducers. Are you saying the depth trans is smaller than the speed? That would be surprising, but I suppose it's possible. -Patrick C&C LF38
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