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:
Publish date:

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:

DonCasey

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

albintoilet

Gear: Albin Pump Marine Toilet

Head Start Is there room for a new marine toilet? Albin Pump Marine thinks so, having just introduced its line of Swedish-built heads—ranging from compact to full-size models—to the American market. The toilets feature vitreous porcelain bowls and either wooden or thermoplastic ...read more

07n_45R2699

Multihull Sailor: Classic Cats

If you’re looking for a decent sub-40ft cruising cat, you have few choices when it comes to new-boat offerings. It is a well-known fact that the multihull market has taken off in a way very few could have predicted. Despite Hurricane Irma’s recent destruction of a large part of ...read more

TOTW_PromoSite

SAIL's Tip of the Week

Presented by Vetus-Maxwell. Got a tip? Send it to sailmail@sailmagazine.com Thanks a bunch  This scene is very calm and seamanlike. No frantic rope throwing or shouting. As he passes the line to the gent on the dock, the crew on the boat says, quietly and clearly, “Would you ...read more

mcarthy-and-mouse

Experience: McCarthy and the Mouse

Sitting at the helm in a light breeze, my arms crusted with a fine rime of salt, my skin so dry I’d lost my fingerprints, I heard a clatter and a curse from below. There were only three of us a thousand miles from shore and only one on watch at a time. Usually, the off watch lay ...read more

2018-giftGuide

2018 Holiday Gift Guide

Brass Yacht Lamp Does someone on your gift list spend the whole winter missing the warm days on the water? Let them bring a little bit of nautical atmosphere home with this new lamp from Weems & Plath. The glass enclosure means the flame cannot be blown out even by ...read more

image001

Opinion: On Not Giving Up Sailing

E.B. White was 64 when he wrote his now-famous essay “The Sea and the Wind That Blows,” which begins as a romantic paean to sailing and then drifts, as if spun around by a pessimistic eddy of thought, into a reflection on selling his boat. Does an aging sailor quit while he’s ...read more

1812-JeanneaueNewsVideo

Jeanneau Sun Odyssey 410

Designed by Marc Lombard, the Sun Odyssey 410 shares much in common with her older siblings including of course, the walk-around deck. Other features that set the 410 apart from other models being introduced this year include the 410’s “negative bow” shape allowing for a longer ...read more