A real Catch 22 for a builder who likes to pinch pennies. Bronze Thru Hull 3/4" Pipe Size, 1-7/8" Flange O.D., Max. Bring it back to gelcoat ready for the new thru-hull fittings. Measure your boat hull for the required space to install thru hull tips. You need to measure the diameter of the thru hull in question. However, they all add up. Wet sand this smooth before bottom painting. To oversimplify, the smoother the boats skin the submerged part of the vessel the less power is required to drive it to a given speed. The fairing putty should be epoxy based, using either microballoons or microspheres for thickening. When I see a valve on a thru-hull I rarely if ever see them cut shorter. To apply the load gradually and steadily I used an old Lewmar self tailing winch attached to the end of the work bench. Reproduction in whole or in part without permission is prohibited. Apply a 1/16" thick layer of marine sealant (3M 4200 or Sikaflex 291 are popular choices) to the surface of the transducer that will contact the hull/fairing and up the stem. Any glass dribbles on the inside of the hull should also be sanded or ground off before installing the seacock. We cant really blame the builders for installing UL Marine parts and then not having them meet the minimum standards, or can we? Be wary of obstructions that can limit the levers throw. 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. If installing the typical flush through hull fitting sounds like a big job, you can rest assured that it is. This area, and the outside of the through hull fitting, should receive a prime coat of clear epoxy resin to improve the bonding of the fairing compound. It would certainly help to make the assembly shorter but I just dont see this done very often. This is far easier to do in the original hull layup than in an existing hull, although it can be done if youre a real masochist.
Selecting Marine Hoses | West Marine Erika. Stainless steel transducers are recommended for steel or aluminum hulls. The thru-hull was fitted to my bench and tightened down well using a spud wrench.
It failed at 458 pounds. Either stainless steel or bronze is acceptable whenmounting nylon seacocks. Install Your Backing Block Install your backing block following the instructions in my other articles on seacocks. If the thru-hullis too short, use thinner plywood ( inch, for example) toconstruct the backing plate. 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. The valve was then threaded onto it and the elbow threaded into the valve. Get the fairing compound as smooth as you can, tapering as evenly as possible. In any area where daylight shows under the straightedge, fill with more compound. The apallo seacock has "500" marked on its body. 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. Ideally, the buildup should cover an area no less than one foot square, and consist of alternating layers of mat and roving, with the resin carefully squeegeed out, just like laying up a hull. I am so sick of winter. thru hulls and other fittings are measured according to "nominal pipe size". Does not apply to Truck Freight orders or hazardous orders. 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. a hole in the center with the hole saw used to drill the thru-hullhole in the hull. flange, then insert it into the hull. Does this test mean a seacock like this will fail in normal use?
Through-hull Fittings | Discover Boating Before taking deliver of a vessel, with a piss-poor seacock installation, do your best to negotiate proper seacocks into the deal. Safety and reliability depend upon the right gear. It must also be compatible with your boat's hull material. The cabinet that the bilge pump hose runs through is also where the electrical fuse panel and switches are, so I'd really like to get this fixed to avoid creating extra opportunity for . This will ensure there is marine sealant in the threads to seal the hull and hold the hull nut securely in place. Swap the bit for a hole saw matching the through-hull's outside diameter and cut. You dont want to create a fillet of resin in the mortise that keeps the fitting from pulling in all the way. Probably not but there is a higher probability than a seacock assembly that actually meets the ABYC standard. The builders get away with installations like this, because we the buyers allow it. TruDesigns website (Below) is very helpful and easy to navigate to find all the fittings needed.Tools \u0026 Materials Required:Safety Gear, Grinder, Silicone Gun, Scraper, Spanner and/or Multi-Grips, Hammer, Fine Sandpaper, Sander, Drill with small grinding stone (not essential), SIKA 291i, some old bung plugs, Turps and old rags. Thanks again in advance. If there is a small leak, there may be considerable bilge water accumulation after 24 hours. 1. On the inside, fit the backing plate over it, A seacock is not simply a ball valve. Then cut the fairing. Then commence drilling in the forward direction. The larger the area over which you fair in the fitting, the more effective the job will be in terms of reducing drag. Chances are that it will be lightly bonded in place, no matter how thoroughly you wax it. Use a drill stop or piece of tape on the bit to avoid drilling all the way through the bottom of the boat. To mimic what a boat owner, or boat yard may install, the components were a mix of what was on hand at the chandlery. Mounting your transducer in an incorrect location can cause a problem due to turbulence, air bubbles and obstructions such as the boat's keel. The though hull fittings and seacocks we used were from TruDesign made in New Zealand. In practice, the mortise should be very slightly deeper than the flange thickness. Most any boat maintenance guru worth his Vedawill advise you to avoid adding additional 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. Smooth and rough are, of course, relative terms. The bevel can then be cut in with a sharp carving blade. Less care is required with a wood or fiberglass hull. Ready to put the boat back in but there is a foot of ice on the creek and 2 more storms are forecast for . You must log in or register to reply here. 1591 E. Atlantic Blvd, 2nd Floor
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. It helps to have someone on the outside of the boat to prevent the thru hull from spinning as you torque the nut flange. Although they are out of sight and, at times, difficult to get at, through-hulls need careful routine checking, at minimum every three months. In the process I gave up 1 3/8 of lever. Two methods are acceptable. 1. 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. Remove the thru-hull nut (it will not be needed), insert . Required fields are marked *. Coil any excess cable and secure it in place with cable ties to prevent damage. 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. Once the dry fit is complete, disassemble everything andseal both backing plates with three to four coats of epoxyand allow to dry. ----- Jacksons Treats -----https://www.paypal.me/jacksonstreatsPlease help us support animals along our Journey from dental sticks for street dogs to food and vet bills!-----Instagram-----@sailing_sunday@brittnimoffatt@ryanweepers@jacksontheshepherdx----- ETSY-----https://www.etsy.com/au/shop/CrystalLilyTheLabelBrittni has been making paintings, arts and crafts for years now and now sells on her ETSY page. Bronze transducers are recommended for fiberglass or wood hulls. Since the glass mixture may get hot, the steady hand should be gloved. 1.
How to Install a Thru Hull Marine Exhaust System & Exhaust Tips The apallo seacock has "500" marked on its body. 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). In all fairness to the builders I suspect they actually believe these installations do or would meet the minimum safety standards but as I found out they certainly may not. Remember that paraffin is flammable, so hold the fitting with pliers or set it on the ground before heating. Its fairly conservative to say that if the hull is less than 3/8 thick at the location of the through hull, you should fair in rather than recess the fitting. Option #2 Remove the cracked fitting and replace with the same thing (if you ever plan to use them for the orginal purpose) and add a short piece of hose with a plug in it. Before the scheduled haulout, make sure you have the correct transducer. FINAL STEP:Grab a Beer you've earned it!! Take your time. Most any boat maintenance guru worth his Veda will advise against adding more thru-hulls if at all possible. Always dry-fit the thru-hull/seacock prior to final installation. If you want flush fittings on a thin solid hull, it will be necessary to lay up fiberglass on the inside of the hull, in effect building a glass backing block under the seacock at least as thick as the hull skin, preferably thicker. Is this type of installation worthy of $200,000.00 ? It can be a reasonably simple project if you take the short course fairing in but can quickly develop into a fairly time consuming job if you choose the more effective solution recessing the fittings flush to the surface of the boat. STEP 1:Using your grinder, carefully grind off all the old thru hull fittings as seen in this video. Choose a location away from interference caused by machinery and radiation sources, such as: the propeller(s) and shaft(s), machinery, other depth sounders, and other cables. Use a sander or wood rasp to shape the backing plate asneeded to match the curvature of the hull. When planning the installation, choose a location thatprovides good access to the thru-hull. The hole is about 1/2 inch diameter, its 3/4 inch if I measure the width including the threads. Copyright 2023 Boating Magazine. The bronze UL Marine thru-hull fitting was made by Apollo/Conbraco, the UL Marine valve by Groco and the bronze elbow was also manufactured by Groco. 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. A $2.99 multi-sized hole saw from the discount store may get you through one hole, if you never think youre going to use it again. Apply sealant to the screw holes and insert the screws. JavaScript is disabled. If there is any petroleum residue inside the hull, remove it with either a mild household detergent or a weak solvent (alcohol) before sanding. In an installation like this the seacock assembly should end at the male hose adapter, then have soft hose, then any additional piping. Drill a pilot hole through the backing plate and hull, dead center in the diameter of the circle representing the seacock's barrel, which you traced inside the hull. The discharge thru-hull for our example will be bronze. A hole saw arbor costs about $8, the hole saws about $8 to $12 each. When installing a stainless steel transducer into an aluminum or steel hull, care must be taken to isolate the transducer from the hull to prevent galvanic corrosion. Pre-drill the holes for the flange screws, using the flange as a template. A mixture the consistency of cake frosting is just about right. For a better experience, please enable JavaScript in your browser before proceeding. (You can get them at most Marine Supply stores.)
Boats and Thru-hull Holes - Southern Boating If you screw a valve onto a through-hull, you wont get a good seal and wont be able to screw the valve down flush with the hull, and since valves arent fitted with grease ports, bonding wire tabs or drain valves, winterization, service and maintenance are problematic. 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. For more information check out their website! I wanted to mimic a real world type installation and most, at least in bronze, are of mixed parts, not just one brand. Tapping into anexisting discharge or intake thru-hull is oftenrecommended but may not always be an option. Step 1: Planning the Install The first step is to determine where the fitting will be installed, and as the adage goes, you want to measure multiple time to make sure you won't be encountering any problems down the road. To help all future readers. Installing an in-line valve onto an NPS thru-hull fitting createsa mismatch of threads resulting in a weaker, less waterproof joint (due to less threadengagement). Dont cut through the inner skin! Glue your backing block down with epoxy resin. If you want better construction techniques keeping your family afloat, it needs to start with us, the consumer. If installing a stainless steel transducer in a metal hull, be sure the isolation sleeve is between the transducer stem and the hull (see Figure 3). Use grommets to prevent chafing and support the cable properly with cable clamps or wire ties, per ABYC specs for marine wiring. Recheck steps 1 through 4. Choose a location with a minimal deadrise angle, unless youre installing the appropriate tilted element transducer for your hulls shape. 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. The hose coming of the seacock is labeled 1 1/2 inches but the outside of the mushroom going to the seacock measures 1 7/8 with my cheap plastic calipers. I just did not have a good way to apply the load to the actualinboard end of the assembly of this particular 90 degree hose adapter. Get community news, buying bargains, and how-to guides at your fingertips.
Thru-Hull Fittings Maintenance Tips | Boats.net It's a pretty good bet that the existing hose matches the diameter of the fitting, but it doesn't hurt to verify. After all, shes a cruising boat. Are you still using that excuse for the poor light air performance of your boat? 2023National Marine Manufacturers Association. If there is a rib, strut, or other hull irregularity near the selected mounting location, drill from the outside. Light tapping with a wood or plastic mallet, or a hammer and a softwood block, should free it from the hull. Shape the fairing to the hull as precisely as possible with a rasp or power tool. Anything approaching one milliamp . This allows a little room for bedding compound under the flange when the fitting is actually installed. Remember, bottom paint is removed and the surface given some tooth by sanding in the area to be faired. Frank Lanier Thru-hulls and seacocks need to be readily accessible. Take each appropriate size to the through-hull it fits, drill a hole in the larger end and thread a string or monofilament line through and tie it to the through-hull fitting. The pad can be tapped and machine screws threaded in, eliminating the need to drill through the hull. Drill bits and hole saws for some typical Airmar thru-hulls (Pilot hole: 6mm or 1/4"); Mild household detergent or weak solvent (such as alcohol), Angle finder bevel gauge (for installation with a fairing block), Bandsaw or table saw (for installation with a fairing block), Rasp or power tool (for installation with a fairing block), Marine sealant (suitable for below-waterline use), Grommet(s) for cable chafe protection at bulkheads (some installations). *FREE STANDARD SHIPPING applicable on orders over $99.00 within the 48 contiguous United States. A through hull retaining nut, which is designed to hold the fitting in place when it is installed without a seacock, will probably be adequate for securing the fitting during the critical cure period of the new fiberglass. ----- PATREON -----https://www.patreon.com/sailingsundayCome join the crew on PATREON! Measuring Link for REAR EXIT. The long side must be parallel to the centerline of the boat. On the inside, fit the backing plate over it, then install and snug up the flange nut. All rights reserved. Do I buy a 1/2 inch or 3/4 thru-hull? 2. Despite this 1 3/8 of favorable advantage, for the seacock assembly, the thru-hull still failed at 404 pounds and never got close to 500 pounds for 30 seconds. The Fora platform includes forum software by XenForo. 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. It was not the thread mismatch that failed. In the diagram above, the core has been replaced with epoxy and a cylinder has been glued inside. You can use plywood as a backer, but I prefer to make one using fiberglass cloth, mat and resin. The seacock will be a typical flanged bronze unit with acompatible bronze thru-hull, although Marelon polymerseacocks and thru-hulls would be another option. Once the fitting is installed, trowel the edges of the mortise with epoxy putty to smooth the transition between hull and through hull fitting. Or, make a reamer by chucking the long leg of a hex wrench into a drill, using the short leg to excavate the core. Why handicap a cruising boat, which is probably already underpowered in light air, by having a bottom which almost guarantees reduced performance in the lightest conditions? My suggestion: What's the size of the hose? Your email address will not be published. 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. Rather, the edges are vertical sided. Next, dig out the core material around your cut for a distance of an inch or more, cutting back with a sharp knife or chisel. A 1/2 inch thru-hull will need a little more than that when cutting the hole on hull. Repeat the process when screwing on all your fittings, and use 2 new hose clamps on all hose connections. Flush fittings are frequently used in fiberglass boats with cored hulls, since the total hull thickness is enough to accept then without weakening the layup excessively. 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. Putting on the fairing compound is trickier than it sounds. This was also a 2011 production sailboat. For displacement hull powerboats, locate the transducer 1/3 of the way along the LWL and 6" to 12" off the centerline. The intake thru-hull will screw directly into the seacock. Thread the appropriate hose fitting for the equipment being served onto the top of the seacock. Fair Through Hull Fittings: Essential to a Smooth Bottom, PS Advisor: Using Acids to Clean Propellers. If your hull is thick enough, or if youre willing to do a little more work on the inside of the boat to locally strengthen the hull, you can flush recess a through hull designed for surface mounting, using the same method required for the European-type fitting. As an additional precaution you should get wooden bungs (tapered soft wooden plugs) for each through-hull in your boat. We replaced every Thru Hull and Seacock on Sunday with TruDesign. Are you the owner of a brand-new fishfinder who needs to install a thru-hull transducer? Finally cleaned off any excess and left to dry overnight.STEP 6:Don't stress!STEP 7:Tighten the final turn the following day. Typically, this means the head intake and discharge fittings. If you want to spend the least amount of money and time, youll simply fair in the surface mounted through hulls. As soon as the resin mixture has kicked off, remove the through hull. To fill the cavity youve created by removing core material, youll need loose fiberglass fibers, or chopped strand mat, which easily pulls apart. 27.4.4 Seacock A type of valve used to control intake or discharge of water through the hull. The arrow/pointed end will be pointing toward you for installation on the starboard side of the boat or away from you for installation on the port side. Put a small amount around the ring of your thru-hull fitting and push in with a slight twist clockwise. The materials for this test were all off the shelf UL Mairne products. It never even made it to the ABYC bare minimum let alone hold that for 30 seconds. Microspheres are slightly less dense, and their white color gives you a fairing putty that more or less matches the white bottom gelcoat of most boats. FREE SHIPPING to stores available for ALL products including hazardous & truck freight items. A thru hull (or through hull) fitting is defined by the American Boat and Yacht Council (ABYC) as a device that allows the passage of liquids or gases through a hull. All rights reserved. It may, however, be necessary to physically hold things in place on the inside of the boat. You must mix a putty of a consistency that is full-bodied enough not to sag off the hull while it dries, but is not so thick and dry that it cant be smoothed with a trowel. Test the fit of the through hull fitting in the holes youve cut in the hull.
Stray Current Test - Power & Motoryacht A Bonnier LLC Company. 27.5.5 Thru-hull fittings shall be designed and constructed to meet ANSI/UL 1121, Marine Through-Hull Fittings and Sea-Valves. 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. The hose coming of the seacock is labeled 1 1/2 inches but the outside of the mushroom going to the seacock measures 1 7/8 with my cheap plastic calipers. You want the seacock flange to screw down tight to the backing plate, not be suspended above it. Use the remaining section of the fairing thats attached to the cutting jig for the backing block that will go inside the hull. The tests were performed in my shop using the work bench as the test jig. Note that very small leaks may not be immediately obvious. If the transducer includes a connector, do not remove it to ease cable routing. The smoother you put it on in the initial application, the less sanding and spot filling you must do after the first coat has dried. Despite this 1 3/8 of favorable advantage, for the seacock assembly, the thru-hull still failed at 404 pounds and never got close to 500 pounds for 30 seconds. Using a hole saw, cut a circle in the hull the depth and diameter of the through hull flange. Apply a 1/16" thick layer of the marine sealant to the outside of the sleeve. Through hull fittings specifically designed to be recessed have either a flange with vertical sides sort of like the butt hinge designed to be recessed in the edge of a door -or they are beveled on the underside of the flange. For good measure, bevel the top edges of the plate with a file or by rubbing the disc on 40-grit sandpaper glued to a workbench. 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. -Make the mixture dense -more fiber than resin. Slide the backingplate over the thru-hull, orient as required and press down,bedding it to the hull.
Thru-hull fittings | Sailboat Owners Forums A straight male hose adapter is even . , pipe measurements are based on the inside diameter. Get community news, buying bargains, and how-to guides at your fingertips. Always FREE in-store pickup. !---- TRU DESIGN -----https://www.trudesign.nz. This image shows a close up of the failure. 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. It is cut at the angle of the hulls deadrise, and part of the fairing is mounted inside the hull as a backing plate.
Installing A Seacock In A New Location - Marine How To 27.5.4 Seacocks shall be designed and constructed to meet ANSI/UL 1121, Marine Through-Hull Fittings and Sea-Valves. I talked to John at Groco today and he was immensely helpful and patient. We have heard great things about them across many countries and now after installing them, we highly recommend them ourselves!---- LIKE AND SUBSCRIBE ----If you like our videos please show your support, like and subscribe to see our weekly videos every Sunday morning following our adventure with our German Shepherd Jackson and rescue kitten Finn sailing around the world. The flush fittings work best if the hull skin is 5/8 thick or more, which means either a wooden boat, or a large fiberglass boat.
For example, the typical 1 l/2" through hull for a head discharge sticks about 1/4" above the surface of the hull. I want to replace the thru hull under the galley sink. (see Figure 4).
How to fit and service through-hull fittings - boats.com Fairing in a fitting is pretty much the same, whatever the hull material. Once youre satisfied with the smoothness of the job, prime the area, including any adjacent gelcoat that has been sanded, with a two-part epoxy primer. Just reach down, put the tapered end in the hole, and press down until tight and the leak has stopped. Be sure to drill into the backing plate only, I.e. If the thru-hull is too long, cut it to length. The result is a perfectly recessed through hull, without replacing any existing fittings. Mounting Location Guidelines B260 bronze thru-hull with standard fairing block. Outside diameter of all fixtures will vary of course (what's an outside diameter of a seacock anyway? As with all installations of through hulls, round the transition between the bottom of the mortise and the hole through the hull for the stem of the fitting.