The selection of gland packing is a very important part of the marine engineer’s job. amazon_ad_logo="hide"; function go6() Then add 16" (for MotorGuide) or 20" (for Minn Kota) and select the next closest measurement. If the shaft is often moved axially, such as with many paper refiners, packing is often the only option … Whatever size the item or package will be when it’s shipped will be what you input here, including any extra padding or wiggle room you choose to have. } Put the new gland packing on the shaft circumferentially or on a template and then mark and then cut the required length. When you have the boat laid up in the off season, get a couple wrenches the proper size, and make sure you can crack the jam nut loose. VicB - that shaft size looks a little thin for that model. That discloses a 1 3/4" shaft. Do not use scissors or hack saw blade etc. } amazon_ad_tag="nhknives-20"; amazon_color_logo="FFFFFF"; The drivetrain starts at the transmission and includes everything through the end of the propeller shaft – including couplings, drive plates, the marine stuffing box and shaft packing, or marine shaft seal, the flex couplings, the cutless bearing and more. Boat Drive Train, Shaft Packing & Stuffing Boxes. Copyright © 2020 Bright Hub PM. } The following are the cautions and the instructions while installing new gland packings. The figure obtained must be divided by 2 to get your gland packing size. After the gland packings have been removed the spaces must be thoroughly cleaned with compressed air to ascertain than no residues of the old packing remain inside. The most accurate is to measure the size of the shaft and calculate its perimeter or circumference. What size flax packing do I need? I want to install gore packing on my shafts. This factor must also be considered in giving some gap. Packing the drive shaft stuffing box; If this is your first visit, be sure to check out the FAQ by clicking the link above. I don't pay attention to measurements or what it says on the package. You guys are right. Ditto the drill bit. Propeller Guide: Utilize our best in class boat propeller guide to find the correct propeller for your Outboard, Ski/Wake, or Stern Drive marine engine. • Truly a do … location = document.selecter3.select3.options[document.selecter3.select3.selectedIndex].value 5. if (document.selecter2.select2.options[document.selecter2.select2.selectedIndex].value != "none") if (document.selecter3.select3.options[document.selecter3.select3.selectedIndex].value != "none") } The special lubricant and packing eliminate the need for water to lubricate and cool the rotating shaft. Available sizes - 1/8", 3/16", 1/4", 5/16", 3/8", 1/2", 5/8" - accommodate most power and sail boats. Advantages compared to other sealing methods: • Lower cost than a PSS or similar "maintenance-free" stuffing box replacement. amazon_color_link="206BA2"; function go3() Please remember that a little leakage of about ten drops a minute is required for the lubrication and the cooling of the gland packings. One more very important note is that you really need to use the correct size packing. If these are at all wasted, bent, or damaged, you may need a replacement shaft. If it comes out as shapeless wads of fluff, then measure the space between the shaft and the inside of the packing nut to determine the correct flax size. Packing Size Packing Length Price ; ULTRAX125-1LB Duramax Ultra-X Packing: 1/8 inch: 67 feet: $85.00 $66.99. Now is a good time to polish the shaft with some wet/dry sandpaper. Usually, I take the old packing to the store, physically match it to the nearest size and buy a bunch of that. Multiply the diameter of your shaft by 14 to get the approximate number of inches you need for 4 layers of new packing — usually sufficient. These seals require lighter packing pressure than standard oil- and water-resistant packing seals, so they cause less friction and reduce shaft wear. “Avoid measuring a used packing ring as a reference to cut a new ring,” Gillette says. (Inside diameter of shaft log - shaft size)/2; or use Bill's idea and measure with a drill bit. if (document.selecter1.select1.options[document.selecter1.select1.selectedIndex].value != "none") ` Shaft speed comparisons Shaft size in inches RPM Speed in FPM 1 1800 450 1 3200 850 1 3600 1050 2 1800 900 2 3200 1700 2 3600 1800 3 1800 1400 3 3200 2500 3 3600 2800 amazon_color_border="206BA2"; A heavy duty engineer’s knife or a sharpened ordinary knife would do. Use a set of calipers to make sure your “jig” of choice is the same O.D. After the tightening slackens the nuts and finger tighten. If the packing is too big, you squash it a bit so that it will fit into the housing. I've replaced packing countless times. April-15-2005 For shafts of size 16 to 28 mm diameter the gland packing of size 8 mm is used. Gland packing once used must not be reused and never try to reverse a gland packing as the old packing must have lost its properties in service. Butt joint and the second one is at 45 degrees i.e. The packing rings need to reflect the size of the shaft. It is the torque that also determines how the shaft feels to every player, which means that the higher the rating, the softer the shaft will feel. It so simple that nobody thinks of it! A common mistake is winding the new … Therefore, if you know your shaft diameter, obtaining the correct size packing is straightforward. The gland manufacturers also give a list of applications where their gland packing can be used; these should be consulted before use. Do not use anything coarser than 800-grit paper. After the gland packing has been inserted in the pumps (both reciprocating and rotary) the pump must be allowed to run with a moderate leakage for ten minutes and after that start tightening the nuts one turn every five minutes. { I've replaced packing countless times. I measured the shaft and bore just for curiosity and the shaft is exactly 1" and bore of box is 1.0165 inch. In case it is not possible to smooth the surface, the sleeve must be changed at the next possible opportunity. COMPRESSION of the packing material around the shaft over a short distance (Usually about 1 shaft diameter in length). You adjust the size, somewhat, anyway. Gland packings are made of the combination of the materials discussed earlier and are manufactured in plaited, braided, twisted, jacketed, corrugated foil, foil wrapped deformable core, and full foil form. } You just don't want to do the adjusting any more than necessary. Packing Type – Size by cross-section and length in feet. }. amazon_color_logo="FFFFFF"; The size you need depends on the space between the shaft and the inside of the hollow packing nut. Radial/axial motion and misalignment: Most mechanical seals tolerate very little radial movement or misalignment, and little to no axial movement. { However the hammered and thinned packings would again gain their width after being compressed. { Info - OEM Shaft Replacement Guide Replace Your OEM Shafts Properly! HVAC: Heating, Ventilation & Air-Conditioning, How to Select Gland Packing for Different Applications, How to Measure the length of the Packing Required, This post is part of the series: A Guide to Gland Packing, https://www.roymech.co.uk/images/gland_packing.gif, https://lh6.ggpht.com/_rD7JWhpQBzk/Sf28xL_w-lI/AAAAAAAAAkU/mymqhM3aNCU/Gland+packings%E6%B8%85%E9%99%A4%E5%99%A83.JPG, Commercial Energy Usage: Learn about Emission Levels of Commercial Buildings, Time to Upgrade Your HVAC? Choosing the right size moving truck rental is one of the most critical aspects to having a safe and pleasant DIY move. have two 1000 gph bilge pumps so do not see any problem. if (document.selecter5.select5.options[document.selecter5.select5.selectedIndex].value != "none") Modern variations on the … It must also be noted that over tightening the gland also leads to premature wearing of the shaft sleeves. If the packing is too small, then tightening the housing screws wads the packing up so that it stops the leak. amazon_ad_title="Hunting and Fishing"; //--> I don't know if shafts have been replaced with a smaller diameter but that would be unusual to say the least. amazon_ad_tag="boatfixnet-20"; I bought 2' sections of 1/4" and 3/16", hope one of them are right! Removing a gland packing can be very tough sometimes, especially if it is old and well set, you need to have specially contoured tools which the marine engineer learns well to make with experience. (adsbygoogle = window.adsbygoogle || []).push({}); That would make the perimeter 157.07 millimeters. After another five minutes tighten again and monitor the temperature. { The standard shaft length is 42". What is the size packing material I'm going to have to buy and install on my port side dr Order your Marine Shaft Packing and save today. if (document.selecter4.select4.options[document.selecter4.select4.selectedIndex].value != "none") For example if the shaft is of 50 millimeters diameter then the circumference is given by the formula P = Pi x Diameter. In some cases the shafts have even broken due to excessively tightened packing. amazon_ad_title="BoaterEd Store"; //--> Also, I had two pieces of packing in there, was reading somewhere there should be four. amazon_ad_height="90"; Usually, I take the old packing to the store, physically match it to the nearest size and buy a bunch of that. { My shafts are 1 1/4" and the packing size is 3/16".