Outside the hull, pass the threaded rod through a hole drilled in a short length of 2 X 4 and fit the second washer and the nut. -Use the minimum amount of catalyst in your resin. a hole in the center with the hole saw used to drill the thru-hullhole in the hull. What you are going to end up with is a solid glass section of hull in the way of the through hull fitting, and you want to remove all traces of core material that might inhibit the bond between the hull skins and the new glass you put in. #1 What is the correct way to measure for thru hull diameters? Mounting Location Guidelines B260 bronze thru-hull with standard fairing block. Anything approaching one milliamp . Is this level of build acceptable on a $329,000.000 vessel? This means that cutting a mortise is a simple one-step operation, involving only a large spade bit or a hole saw and chisel to cut and finish the recess. For a cored hull, excavate the coring around the hole toa depth that encompasses an area at least as large as thethru-hull or seacock flange. For a better experience, please enable JavaScript in your browser before proceeding. Installing flush fittings in a single skin wood hull is easier than in any glass hull, since the planking is thick, there is no core to remove, and a backing block should already be in place under the seacock.
Boats and Thru-hull Holes - Southern Boating Just drill into the backing plate. Drilling holes in your boat's hull is a counterintuitive thought to any boat owner. 27.5.1 All piping, tubing, or hose lines penetrating the hull below the maximum heeled waterline, shall be equipped with a seacock to stop the admission of water in the event of failure of pipes, tubing, or hose. If you expose steel or aluminum, you must build up the barrier system again before fairing in. While drillinga hole in your boats hull is not ideal, the actual process toinstall a new thru-hull is pretty straightforward. To reduce electrical interference, separate the transducer cable from other electrical wiring and the engine. The load was measured in pounds and set to capture the moment of failure or peak hold. Once the installation is finished, fit the seacock with anappropriately sized tailpiece/hose barb (using thread sealant)and attach the cooling system intake hose to it.
Fair Through Hull Fittings: Essential to a Smooth Bottom Click on the link and support us! You probably have a 1/2 inch one, but best way is to measure it.
Know how: Thru-hulls and Seacocks - Sail Magazine Traditionally, through-hull fittings and seacocks were made of bronze and manufactured as a single part, as opposed to having a separate through-hull fitting with a seacock screwed onto it.
Thru Hull Size? | Sailboat Owners Forums But it takes a smooth bottom to help it along in a three knot zephyr. Note that a different size hole saw is required for every different size through hull fitting, so by now youre going to have to spend some money. There's no noticeable droplets, but I can see a wet sheen below the fitting and a small amount of water pools in that cabinet over the span of a couple of days. Test the fit of the through hull fitting in the holes youve cut in the hull. If you do not receive an email contact Customer Service. This rounded area will hold enough bedding compound to keep the fitting from leaking. A much more easily installed flush fitting is made in Europe, but does not appear to be available in this country. Screw Down Seacock We replaced every Thru Hull and Seacock on Sunday with TruDesign. B260 bronze thru-hull with standard fairing block.
Best Way to Cap Off a Thru-Hull - Cruisers & Sailing Forums The thru-hull was fitted to my bench and tightened down well using a spud wrench.
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Installing a Thru-Hull Transducer | West Marine Shape the fairing to the hull as precisely as possible with a rasp or power tool. A hole saw arbor costs about $8, the hole saws about $8 to $12 each. (You can get them at most Marine Supply stores.) Any thru-hull fittings that are damaged or can't be unblocked must be replaced immediately, as should any seacocks that are jammed or can't fully open or close. While a boat owner may assume the manufacturers would have tested these fittings for the application into which they are sold, they clearly have not.
Stray Current Test - Power & Motoryacht For our intake thru-hull,verify that the seacock can be accessed quickly in theevent of an emergency and that the handle can be fullyoperated (i.e., no frames, bulkheads, etc., that block thethrow of the handle). For inboards, mount it well ahead of the propeller(s) and shaft(s). Many of the builders, who install seacocks in this manner, very often display the ABYC logo quite proudly suggesting their vessels are actually built to meet the minimum safety standards. ?"..Ran-day's latest assignment is to locate all the thru-hulls (or is it through-hull? For example, the typical 1 l/2" through hull for a head discharge sticks about 1/4" above the surface of the hull. This set up failed at just 404 pounds and I was an 1 3/8 below theinboard end of the assembly so I had slightly less leverage than I would have had I been able to apply the load at the absolute inboard end of the assembly. A fair amount of grinding and smoothing will be required on the inside of the hull after the interior layup is added, to make the job look clean and professional. For fin keel sailboats, mount it to the side of the centerline and forward of the fin keel 1' to 2'. ----- PATREON -----https://www.patreon.com/sailingsundayCome join the crew on PATREON! 27.5.5 Thru-hull fittings shall be designed and constructed to meet ANSI/UL 1121, Marine Through-Hull Fittings and Sea-Valves. When planning the installation, choose a location thatprovides good access to the thru-hull. The simplest way, although its accuracy may not be perfect, is to carve a soft wood plug to fill the existing hole, then carefully locate the center by measuring for and drilling a small pilot hole in the center of the plug. Get your new flush-type through hull, and get a hole saw the diameter of the flange of the through hull fitting. FREE SHIPPING to stores available for ALL products including hazardous & truck freight items. The only caveat is that with metal boats, you must not damage the barrier coats between metal and bottom paint. Moving down 1 3/8 on the assembly actually favors the seacock when testing to ABYC H-27 standards. In the process I gave up 1 3/8 of lever. Seasoning mixes, dry rubs and dessert time-savers, Effortless Dock Maintenance: Expert Tips For A Well-Maintained Waterfront, Day 8 Unveiling The Magic: Exploring Norman Islands Spectacular Treasures, Day 7 Revealing The Marvelous Jost Van Dyke, Day 6 A Tropical Time In The World Of Scrub Island, Day 5 Anegada Island: Great Lobster, Spectacular Reefs, and more. You should operate the valve by turning it on and off to make sure that when an attached hose fails you can stop the water flow. A wide range of such products is offered on our virtual shelves. The result is a perfectly recessed through hull, without replacing any existing fittings. 3. To fill the cavity youve created by removing core material, youll need loose fiberglass fibers, or chopped strand mat, which easily pulls apart. The tests were performed in my shop using the work bench as the test jig. As soon as the resin mixture has kicked off, remove the through hull. STEP 3:Remind yourself why you're doing this!STEP 4:Test fit your new thru hulls are correct before gluing down, if you have trouble fitting them you can remove the handle for installation and screw back on once completed. Remove the thru-hull nut, insert the thru-hull into the hull, fitthe backing plate, thread the seacock onto the thru-hull, andtighten until snug. The arrow/pointed end of the fairing points forward toward the bow. STEP 5:Clean all the surfaces and thru- hulls with turps ready for install and apply your sealant, we used SIKA 291i throughout the whole process. The though hull fittings and seacocks we used were from TruDesign made in New Zealand. Select this link to make sure you in fact have the necessary space required to install 'REAR EXIT' thru hull tips. Option #1 Remove the cracked fittings and replace them with thru hull transom sleeves (they make them in plastic) and then plug them. 27.6.1 A seacock shall be securely mounted so that the assembly will withstand a 500 pound (227 Kg) static force applied for 30 seconds to the inboard end of the assembly, without the assembly failing to stop the ingress of water. It may also be necessary to cut the stem shorter to allow it to screw far enough into the seacock to be flush with the surface of the hull. When the sheet has cured, pop it free of the glass it wont be stuck fast and clamp it onto a scrap of wood. I want to replace the thru hull under the galley sink.
Shes not very fast in light air. Sizes are usually available in 1/16 increments. EDIT: I later tested a 1 thru-hull & ball valve combo and had it fail at below 500 pounds as well. Using a trowel, wide putty knife, or flexible spatula of the type used in auto body work, trowel the putty onto the wet unfilled prime coat of resin. Option #3 Remove the crakced fittings . 3. When the inevitable happens you wont have to go looking for the bung. By Randy Vance January 14, 2010 Transducer Mounting Boating Magazine Our bottom finder is only as good as the signal sent and received by the unit's transducer. Youshould see a ring of sealant ooze from beneath the thru-hull nut. A straight male hose adapter is even taller than the elbow and would thus provide for more lever and move the, This was a nicely executed seacock installation on a brand new Island Packet. 27.6.1.1 The installation shall prevent any movement of the assembly. Many through-hulls such as engine-cooling intakes and sink or cockpit drains, tend to be left open continuously and the valves may stick in the open position. A wedge of plywood inserted in the thru-hull alsoworks well in a pinch. Stainless steel transducers are recommended for steel or aluminum hulls. Fax: +1 (954) 522-2260
I talked to John at Groco today and he was immensely helpful and patient. This epoxycompression ring provides a solid base for the thru-hull andprevents water from entering the core. If the thru-hullis too short, use thinner plywood ( inch, for example) toconstruct the backing plate. 27.6.1.3 Threads used in seacock installations shall be compatible (eg. It must also be compatible with your boat's hull material. https://www.google.com/search?q=pipiv&sa=X&ei=9s1EVaK1FcWrNtvcgIgN&ved=0CB0QsAQ#. Considering the hose on it says 1 1/2 and considering your own statement "measured with my cheap plastic caliper", I would still remove the hose and measure the I.D. For installations in a wood hull, allow for the wood to swell before tightening the nut. 27.4.4 Seacock A type of valve used to control intake or discharge of water through the hull. Oddly enough, the ones weve seen are really a poor design for the job, because theyre fairly difficult to install, and have a flange that is too thick to use in the typical fiberglass production boat without reinforcement of the inside of the hull. You dont want to create a fillet of resin in the mortise that keeps the fitting from pulling in all the way. Raw water intake hoses ingest water from outside a boat to cool an engine, flush a toilet, cool an air conditioner or provide a fresh supply of water for fish in bait tanks. Epoxy resin would work fine, but the cure time is longer and the cost greater. Your fishfinder owner's manual will help you in this regard. Then wiggle loose inside the boat while gently tapping an old bung plug into it from the outside until it releases from the hull. -Backing blocks are essential on the inside of the hull to help distribute load. To check for stray current, with the boat in the water and the shore power disconnected, take the bonding wire off one of your through-hull fittings so it is totally disconnected from the bonding system. One the more tricky jobs in recessing any type of fitting is cutting a circular mortise that is perfectly concentric with the existing hole through the hull for the stem of the fitting. Although they are out of sight and, at times, difficult to get at, through-hulls need careful routine checking, at minimum every three months. It helps to have someone on the outside of the boat to prevent the thru hull from spinning as you torque the nut flange. As for boat thru-hull fittings installed above the waterline, the requirements are somewhat lower, but it doesn't mean they can be omitted. The sealant must extend 1/4" higher than the combined thickness of the hull, fairing and backing block (if used), and the hull nut. A backing plate provides additional support to the hull and aflat mounting surface for the thru-hull nut or seacock flangeshould there be any hull curvature. Because a lot of hands are required in the short time you have to work the catalyzed glass mixture, its helpful to have another person assisting at this stage. However, the isolation sleeve must be below the hull nut to prevent the sleeve from interfering with tightening the nut. Bottom paint surrounding the through hull to be faired in should be removed, and the gelcoat or wood sanded with medium grit paper in preparation for the application of fairing compound. Light tapping with a wood or plastic mallet, or a hammer and a softwood block, should free it from the hull. As a buyer you should demand more than the crap some of these builders are stuffing you with. Rather, the edges are vertical sided. Boating Magazine may receive financial compensation for products purchased through this site. You should also round the edges of the transition between the bottom of the through hull flange mortise and the hole through the hull for the stem of the fitting to leave a space for bedding compound. Then you will buy a new, like-sized fitting. Here the backing block, and Groco flanged adapter are shown epoxied, bolted & sealed into the hull with Sikaflex 291 and ready for the bronze thru-hull to be threaded into it from outside. Choose an accessible spot inside the vessel with adequate space for the height of the transducer stem and for getting a big wrench around it when tightening the hull nut. For a better experience, please enable JavaScript in your browser before proceeding. A seacock is not simply a ball valve. If there is any petroleum residue inside the hull, remove it with either a mild household detergent or a weak solvent (alcohol) before sanding. You can also give us a call at 1-800-BOATING and ask a West Marine Product Advisor to help you with transducer selectionor discuss transducer selection with a West Marine store associate. The seacock will be a typical flanged bronze unit with acompatible bronze thru-hull, although Marelon polymerseacocks and thru-hulls would be another option. 2023 Freshwater Boat and Gear Buyers Guide, Planning and Preparing for Weather When Boating, Looking Forward to Opening Day of Boating Season, Volvo Penta and Groupe Beneteau Partner on Plug-in Hybrid Propulsion. When your glass mixture cures, you should have a perfect imprint of the through hull fitting in the hull, with solid fiberglass surrounding the fitting. Trowel on another coat of putty in any low spots, which can be detected by running a straightedge over the faired area. Many builders utilize inline valves attached directly to the thru-hull. Measuring Link for REAR EXIT. Plastic transducers are not recommended for wood hulls, since the expansion of wood can damage a plastic transducer. As it has no mounting flange, an in-line valve can turn or loosen fromthe thru-hull fitting due to vibration or through normal use.
How to measure thru hull | Sailboat Owners Forums Enjoy banner ad-free browsing with SailNet Community Plus. While some builders are off pinching pennies other builders actual do care about below waterline integrity. When the inevitable happens you won't have to go looking for the bung. Sand the putty smooth, touch up any voids, and prime with epoxy primer. Use a hole saw to cut out a disc larger than the footprint of the seacocks flange. It was not the thread mismatch that failed. Refer to the fishfinder owners manual to connect the transducer to the instrument. Build a Backing Plate Seacocks are required to shut off the flow of seawater supplied via a through-hull fitting to onboard equipment, including engines, gensets, livewells, air-conditioners and the head. Be sure to correctly orient the fairing on the bandsaw, so the angle cut matches the intended side of the hull and not the mirror image. The water flowing under the hull must be smooth with a minimum of bubbles and turbulence, especially at high speeds. The materials for this test were all off the shelf UL Mairne products. I replaced all my thru hulls and always used the nominal hose diameter when ordering thru hulls. As a general rule, you should fair a through hull over the area of a circle whose radius is equal to about 4 for every 1/8 the fitting protrudes above the surface of the hull. For practical purposes, the bottom of a displacement-type sailboat can be considered smooth if the surface varies no more than 2 mils .002! After all, shes a cruising boat. Are you still using that excuse for the poor light air performance of your boat? Whether you decide to recess fittings or fair them in depends on the hull construction, the amount of money you want to spend, and the amount of time you want to spend. I was planning to rig up some 5/8 thick fiberglass and bolting it to the bench using some big backing plates but after running some numbers it appeared the 3/4 plywood should handle the loads, and it did. In addition, if you decide to replace your existing surface mounted fittings with flush fittings, youll have to lay out about $15 for a flush 3/4 through hull, and about $30 for a similar l1/2 fitting. It is 1 1/2. Support the length of wood on both sides of the fitting with a couple of wooden blocks. The plug is left in place during all the concentric cutting, then knocked out. To find the location and hours of a West Marine near you, visit. A manual reamer can be made by heating an old file and bending its tang in a vice to form a right angle. Office: +1 (954) 522-5515
What is the correct way to measure for thru hull diameters? Youll need a second set of hands tohold the thru-hull in place during installation and whiletightening. Make sure that they are the proper diameter to fit in the through-hull. You probably have a 1/2 inch one, but best way is to measure it. Several rules apply when recessing fittings, whether you use special flush fittings or regular surface mount through hull fittings: -The depth of the mortise must not exceed half the skin thickness of the hull unless the inside of the hull is reinforced. 2. Belvoir Media Group, LLC. I purchased everything from Hamilton Marine in Portland, ME. On the inside, fit the backing plate over it, The lower the background noise level, the higher the fishfinder gain setting you will be able to use. You are not likely to notice an immediate improvement in the performance of the boat, since were talking about relatively small changes. Probably not but there is a higher probability than a seacock assembly that actually meets the ABYC standard. Erika. Obviously, at some point fairing in over an increasingly larger area simply doesnt pay off. Ready to put the boat back in but there is a foot of ice on the creek and 2 more storms are forecast for . And do not mount the transducer where the boat may be supported during trailering, launching, hauling, or storage to avoid damaging the transducers face. Bronze transducers are recommended for fiberglass or wood hulls. There are some bulky ones that require a bit larger hole. CHIRP transducers need to be mounted in a cool, well-ventilated area away from the engine to avoid overheating. STEP-1: Cut a hole through the hulland backing block slightly larger thanthe thru-hull fitting OD, and measurethe thickness of the hull and backingblock together (Dimension-A). Or FREE standard shipping on $99+ orders. Outside diameter of all fixtures will vary of course (what's an outside diameter of a seacock anyway? Instead this builder decided to make the inboard end of the assembly nearly 1 foot tall What is it Forest Gump used to say?
How to fit and service through-hull fittings - boats.com You will need to build a jig out of plywood to safely hold the transducer at the precisely correct angle as you push it past the blade of your bandsaw or table saw. For example, the typical 1 l/2 through hull for a head discharge sticks about 1/4 above the surface of the hull. Install Your Backing Block Install your backing block following the instructions in my other articles on seacocks. I used fine sandpaper and along with a small grinding stone in my drill to gently clean excess sealant around the inside of the hole. Apply alternating layers of fiberglass cloth and mat and wet out in resin until you have achieved at least a half-inch thickness. The secret is to pay attention to underwater fairness and smoothness. If a leak is observed, repeat Bedding and Installing immediately. Once the dry fit is complete, disassemble everything andseal both backing plates with three to four coats of epoxyand allow to dry. Reproduction in whole or in part without permission is prohibited.
Provide your account email address to receive an email to reset your password.We have changed website platforms. The ball valve to thru-hull is a known thread mismatch, NPS to NPT, but this is what is very often done by builders, boat yards and DIYs. Use a drill stop or piece of tape on the bit to avoid drilling all the way through the bottom of the boat. If you cannot meet these conditions, you must not recess through hull fittings. Mounting your transducer in an incorrect location can cause a problem due to turbulence, air bubbles and obstructions such as the boat's keel. , pipe measurements are based on the inside diameter. That's a pretty esoteric tool for most people. 3. Removing the waterproof connector or cutting the cable, except when using a watertight junction box, will void the sensors warranty. I.e. To insure a perfectly flush fitting in the final installation, the through hull should actually be pulled slightly below the outer surface of the skin during the molding process. A steady hand on the threaded tail of the through hull will do the job. The bevel can then be cut in with a sharp carving blade. not into the hull (use a drill stop or piece of tape attached tothe bit to prevent this). I want to replace the thru hull under the galley sink.
Thru-hull fittings | Sailboat Owners Forums However, the core material must be removed around the through hull, and solid glass laid up in its place. Remove the thru-hull nut (it will not be needed), insert . Does not apply to Truck Freight orders or hazardous orders. Thru-bolting adds more holes to the hull and introduces another opportunity for corrosion (the bolts). Using a chisel, clean out the fiberglass within the circle youve cut, so that you end up with a circular mortise whose depth is equal to the thickness of the through hull flange.