Ask Sail: Transducer Extraction

I have to replace my depthsounder. The plastic nut that holds the old transducer in place was set in the hull with adhesive. The new transducer will not fit the old nut, which has proven very difficult to remove.
Author:
Updated:
Original:

Weldon Nelson of Winchester, Massachusetts asks:

I have to replace my depthsounder. The plastic nut that holds the old transducer in place was set in the hull with adhesive. The new transducer will not fit the old nut, which has proven very difficult to remove. I am sure that others have had this problem. Your suggestions on how to remove the old transducer holder would be appreciated.

Don Casey replies:

You must remove the plastic nut. You should be able to split it with a hammer and a wood chisel. Once it is split, you may be able to break it loose with a wrench, or you may have to pry it loose in pieces, wedging it free from the hull with the chisel.

With the nut removed, you can extract the transducer housing as you would any through-hull fitting. A solid whack from inside with a small sledgehammer may break it free and drive it out of the hole in the hull. Otherwise, you can pull it out with a threaded rod or long bolt. Pass the rod through a short length of strong wood bridged across the through-hull hole and supported on each end with wood blocks set against the outside of the hull. Inside, the rod passes up through the center of the transducer housing, then through a steel plate or a piece of hardwood set on the inside end of the housing. Fit both ends of the threaded rod with washers and nuts. Hold one nut stationary and tighten the other one, and the housing will pull out of the hull.

Clean away all the old sealant before starting your new installation. You probably don’t need me to remind you that the sealant should be applied around the flange on the outside of the hull only, never inside the hull, and never to the retaining nut. 

Related

Register-2048

Register of Circumnavigators Launched

Just in time for a fresh class of Vendée Globe sailors to attempt their circumnavigations, The International Association of Cape Horners (IACH) has taken on the responsibility of maintaining an official register of sailors who have completed solo circumnavigations by the Three ...read more

FPO skys0tlm8jlrpynehcpe_NEW

A Half-century of Cruising with SAIL

I cannot say I have been reading SAIL magazine since the very beginning, but I come pretty darned close. Sometime around 1974, when I was in high school, I began buying it every month at our local newsstand and saving every issue until I had great stacks of them, as carefully ...read more

B&G-Halo20+-side-facing

Gear: B&G HALO radar

B&G’s HALO series of radars now includes the HALO20+ and the HALO20, a pair of compact radomes expressly designed for use aboard smaller sailboats. The units measure 20in in diameter and weigh a mere 11lb. The HALO20+, in particular, delivers a full 360-degree sweep every ...read more

PICTON CASTLE under sail with stunsls WV7 compressed

Picton Castle Seeks Crew

The Picton Castle is set to begin its eighth circumnavigation this spring under the command of Captain Daniel Moreland. A professional crew of 12 will guide up to 40 trainees at a time as they learn about all aspects of sailing the bark, from steering to lookout, ...read more

DSC_0013

Ask Sail: Keel Attachments

Q: I have an early ‘70s Catalina 27. The keel bolts look pretty good. My question is, why not glass over the keel to bond to the hull rather than changing the bolts if, or when the bolts are too far gone? I haven’t seen anything on this, so could you discuss? Full-keels are ...read more

04-GOPR0511

Book Review: Sailing Into Oblivion

Sailing Into Oblivion by Jerome Rand $15.99, available through Amazon As refreshing and inspiring as Jerome Rand’s 2017-18 solo-circumnavigation may have been, his account of the voyage in the book Sailing Into Oblivion: The Solo Non-Stop Voyage of the Mighty Sparrow may be even ...read more

01-1970-Dec

50 Years of SAIL

Back in early 1970, Bernie Goldhirsh and the recently founded “Institute for the Advancement of Sailing,” publisher of an annual sailboat and gear guide, launched something called SAIL. A half-century later, a look back at the magazine’s first few years provides a glimpse into a ...read more

Photo-by-Adobe-Stockpics721-2048x

Webinar: Navigating Post-Dorian Abaco

On Thursday, October 22 at 6 pm ET, Navigare Yachting presents a webinar on what to expect from Abaco post-Dorian. The event will feature the authors of The Cruising Guide to Abaco, Steve Dodge and his sons Jon and Jeff.Hurricane Dorian hit Abaco in early September of 2019 and ...read more