marine stuffing boxes and packing glands

This allows the unit to slide forward. When the gland was finally removed to be replaced, it was found that there was no positive means to prevent the frictional torque from being taken by the rubber. Charter Provisioning in the Covid-19 Era. A packed gland installed in a 1983 32′ motorboat. The hose attachment at the aft end is a  water feed that is tapped into the log. In this case the dogs were not engaged and the rubber hose was subjected to torsional shear, which resulted in its failure, Use of general purpose hose rather than the special one made for the purpose. In this case, the Service Your Stuffing Box. C $97.10. Click & Collect. In many designs the outer bearing housing is unscrewed from the stern tube after removing the mounting bolts. Component parts of the standard stuffing box. A somewhat unusual one with a greaser. What I have learned is that packing gland temperatures can be anything but static. Two examples of this problem are known. This allows the unit to slide forward. ... You can now repack the gland. Tides Marine seal installed on a Moody 31. by T.Norris Marine. Stuffing boxes are also used to seal rudder stocks that penetrate the hull below the waterline. A very similar arrangement, this time on a Moody 346. The initial action is to tighten the packing to take up any leakage.  A most unusual failure of the gland nut of a stuffing box. The stern gland or stuffing box as it is sometimes refered to is a much maligned piece of an inboard boats drivetrain. A useful video of the setting process for the PSS seal is shown at, http://www.shaftseal.com/en/about/installation_videos_pss_small_shaft_seals, http://www.tnorrismarine.co.uk/manecraft.php. Greasing helps to lubricate both the packing and the stern tube bearing but care should be taken not to over-lubricate. Latest. The seals on the example shown have been changed three times in around 15 years. The Commercial Marine Expo is the largest commercial marine trade show on the East Coast targeting a variety of maritime related businesses including commercial fishing boat operators, tug boat and tow boat operators, passenger … Duramax Ultra-X comes packed standard on spools of: 1, 3, 5 and 10 pounds. When I removed it yesterday the black part had sheared right across about 10mm inside the hose. Packing is normally square in section and comes in a variety of dimensions. Here the design of the stuffing box is identical to the top one except that the bolted flange attaching it to the stern tube has been replaced by a rubber hose. Brand New. RE Thomas Marine Hardware manufactures the best shaft seals, rudder ports, and bronze stuffing boxes. The packing is inside the gland nut, compressed against the end of the threaded part of the gland. Between the two the recess in the rubber moulding allows small relative movement between the shaft and stern tube. Ultra-X transfers frictional heat to stuffing box, which functions as a heat sink. The Volvo seal is entirely constructed from rubber, combining the hose that attaches to the stern tube with lip seals that prevent leakage of water into the boat. A commonly known example it the head of a faucet. The water feed comes from a dedicated factory tapping, on the injection elbow just after the main water injection pipe. Some water is lying on the stern tube and grease has been splashed up the hull during motoring. – Textile Reinforced Hose. In this design the stuffing box is bolted to the stern tube at the flange. Cutless bearing carrier at the outboard end of the stern tube on the traditional boat shown on the left. For shafts of size 30 to 46 mm diameter the gland packing of size 10 mm is used £40.80. Stuffing box 1-1/4″ Shaft Bronze.  A narrow line of crevice corrosion that has taken place between the shaft and the rotating seal. A compression fitting on the top connects a remote greaser tube for the inboard bearing. The GFO Marine Shaft Packing is approved by the American Bureau of Shipping. Another make, this one labelled BMW. Has only been adjusted three times in 20 years. A generally used stuffing box, these are used in order to seal reciprocating or rotating shafts in order to protect them against the entry of outside fluids. It is necessary to ‘burp’ the seal, compressing it in the lips area by hand to allow air to be dispelled. Grease is pumped at the rate of 1.5 turns after each day’s trip. It also contains two lip seals supplied with oil from a reservoir. Three or four rings are normal for small and medium yachts with auxiliary engines. The seal is not vented in any way. The main difference between older and current production is the vent tube. From stuffing boxes, Deep sea seal and P.S.S. The photo above left shows the arrangement as installed. On the left is the hose that attaches the seal to the stern tube with a wide clamp. The Halyard seal is no longer manufactured but many are still in service. A technical information resource for yacht owners. This reservoir is mounted at above normal sea level, providing a small positive head to counteract the pressure of water acting on the other side of the gland. Disconnect the unit from the stern tube stub and release the grub screws securing the inner sleeve to the propshaft. seals for inboard glands to Water Lubricated Outer bearings, Outrigger bearings and bronze outer bearings. For illustrative purposes I cleaned the stuffing box of it’s oxidation and grime with my a stainless wire brush. A wide variety of marine stuffing box options are available to you, such as material, protection level. (Sketches are high res and can be read at 200% zoom). A small amount of water should be allowed into the boat to ensure that no air remains.  Photo shows the rotating stainless steel face, reversed after the problem was found in order to use the opposing face. The cup is shown on the left. REPLACEMENT ZINC PENCIL ANODE The cutless bearing can be removed from the housing on the bench. Specifically dimensioned for Volvo Penta propeller shafts and sleeves. DV10, DV20, DV24, DV36, DV48. 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. Volvo Penta Stern Glands/Propeller Glands Volvo Penta Stern Glands/Propeller Glands/Rubber Stuffing Box/Sealing Sleeve. Rings of a soft packing material are placed around the shaft inside the gland nut. Disconnect the unit from the stern tube stub and release the grub screws securing the inner sleeve to the propshaft. Stuffing Box Arrangement. Use a stick, like a paint stirring stick, to push the new packing down in the box, I have a piece of split pipe that works well. It is possible to change a Volvo seal (or most other types) afloat, as  this video shows. Not advisable without some experience of doing it in easier circumstances. – Thick wall - 3/8" (10mm)   Once fully tightened the packing rings are compressed within the body. It appears to be a packed gland with greaser aft of the packing. More How To. Oil delivered to the seal from an external reservoir is contained within lips in the body of the seal. A stuffing box—also called a stuffing gland, packing gland or packing box—forms a seal between the prop shaft and the hole in the hull through which the shaft passes while allowing the shaft to turn freely. You could probably get by with 4 or 5 turns. Maintain this gland around the prop shaft to keep leaks at bay. The source of the rust is the carbon steel washers. To the right are two lips that bear on the shaft, retaining water when stationary or rotating. The traditional method for keeping the propeller shaft watertight is the packed gland or stuffing box. The gland nut was repaired by brazing (below right).  In cases where the repaired component is permanently immersed in seawater this would be bad practice, as galvanic corrosion is almost inevitable, but here it is perfectly safe. This HMI seal was installed in 1998 and has performed very well.  Replacement of the seals was low cost and preferred to fitting a new shaft seal. A traditional packed gland provides the sealing. Note also the wire to the stern tube connected to an external anode and the grease tube. I use a deck screw as a puller. The stern gland appears to be directly connected to the stern tube, without a hose. People. Friction between the packing and the shaft causes a torsional stress in the rubber. £70.48. The seal face is flushed with fresh water before wintering in an attempt to avoid a repetition. In principle a stuffing box is identical to the packing nut on a common faucet. Release the prop shaft from the  gearbox coupling to free the unit.  The centre housing can be slipped out of the rubber bellows by releasing the two clips.  The seals and brass bushes are a very tight sliding fit within the casing, secured with Loctite.  Replacement seals are standard items widely available, from e.g. The vent tube obviates the need for ‘burping’ of the seal after drying the boat. or Best Offer. Order) 12 YRS . STERN GLANDS (Stuffing Box , Packing Box) ... gland and the third section is bit of general information and how to detrmine the shaft M/S to select the correct packing. In contrast, flax packing acts as an insulator, trapping frictional heat that can cause shaft damage and loss of seal. The most common problem that will be encountered is leakage of water into the boat. Some of those gland boxes take 12 to 15 turns. Provided the seals and shaft remain in good condition this can be a very reliable seal type. Special tools are available for the job but it is usually possible to drive a screw into each ring in turn, allowing them to be pulled out. Various materials are used for the packing, traditionally flax, hemp and cotton, but more modern materials include graphite, acrylonitrile and Kevlar. Mike Newby’s sketches and words about his stern gear arrangement. Another variation on the basic design. Water Lubricated with Emergency Air Seal. From "Hands-On Sailor" in our January 2008 issue. In many small fiberglass boats, for example, the stuffing box is mounted inboard near the point the shaft exits the hull. Put the new packing into the cap, making sure the scarf joints meet. Toilets, holding tanks and associated matters, Bore glazing and polishing in diesel engines, Setting up your masthead standing rigging, http://www.tidesmarine.com/seriesone-shaft-seals.shtml. See this link  and  this one for more detailed coverage of packed stern gland repacking. The locknut and gland nut remain attached in their normal position. Note the remote greaser tube on the stern gland. Aohong Marine Stuffing Boxes Rope Packing Gland Packing Extractor Tools Yellow Kevlar Fiber Gland Packing . Release the prop shaft from the  gearbox coupling to free the unit. When screwing up the gland it is essential to ensure that the gland flange is parallel to the face of the stuffing box. With the compression sleeve type adjust each nut equally, checking that the flanges on each part remain parallel. EDIT: Since writing this I have conducted extensive temperature testing of packing glands with a fixed temp probe mounted directly to a traditional bronze stuffing box. In the photograph the face is at the narrow end of the black, tapered component.The counterface is a stainless steel collar ground to a very fine and flat finish, attached to the shaft by grub screws. The diagram shows a grease nipple but various different arrangements will be seen below. A serious problem can occur with the type of stern gland that is attached to the stern tube with rubber hose. Failure of the hose could result in flooding of the boat. No dogs were present and a bolted arrangement for taking the torque had apparently been removed by a previous owner. Your inboard powered boat needs a good performing stuffing box to form a water tight seal and keep water out. Immediately to the right of the gland nut can be seen the sleeve that is used in this design to apply pressure to the packing rings. £72.89 postage. Similar types are made by Vetus, and another was fitted as original equipment on the Albin Ballad, shown here http://www.ballad.no/pakkboks.htm although these contain grease. A Halyard seal. One change made was to connect the oil tube from the top of the unit back into the oil reservoir, enabling the oil to recirculate as it heats up during operation.  Later models were piped this way but earlier ones were only vented.The unit was bench tested with the new reservoir arrangement. And another one, maker unknown, installed in a 1981 Comar Comet 1000. A conventional fixed stuffing box, grease lubricated. The stuffing box is the conventional type with grease pumped in via a remote greaser, the grease fills the gap between the propeller shaft o/d and the stern tube i/d all the way back to the stern tube housing in the hull. Shaft logs, ‘P’ brackets, glass in epoxy tubes to … Fortunately the situation was recognised immediately and rectified with the wooden plug shown in the photograph. Stuffing box serves two main purposes. The tightness of the small grub screw(s) on the right hand side of the unit is critical- These clamp the sleeve to the prop shaft. Chesterton Flax 80 packing stern tube shaft stuffing box gland seal rope 7/16" Description. No grease, no mess.Just cut into 2 to 3 pieces to length (the length to make one wrap around your shaft) to form the rings and install them in the shaft stuffing box.Make maybe one adjustment to the packing gland following a short run-in and never tinker with the stuffing box again! A packed gland on a Seamaster 925 sailing boat probably dating from the original 1978 build. Excessive greasing can cause packings to run hot. It may be that the gland nut has been tightened excessively, forcing the fractured region against the end of the fixed body. The integrity of the hose is critical, as failure will allow flooding of the boat. The rubber hose should not be the sole means of resisting torque between the stern gland and stern tube. Various materials are used for the packing, traditionally flax, hemp and cotton, but more modern materials include graphite, acrylonitrile and Kevlar. Available to purchase online, or contact us directly. Invite customers to join your mailing list. Many people make the mistake of just replacing the stern tube rubber with ordinary rubber piping, this is not correct or safe, as it is special reinforced stern tube rubber, in this case it is 3/8” wall x 3” long          (available from T Norris & Co). An example of current production of the PSS seal, The photograph at left shows the seal as installed with the bellows fully expanded. In the centre is a water-lubricated bearing that maintains axial alignment of the seal assembly with the shaft. Here the gland nut has been tightened to compress the packing rings. With the gland nut type, first loosen the locknut.  These nuts are quite large, perhaps 50 mm across flats, and it is worth making or buying spanners to fit them before problems arise. ... Stuffing Box Packing. You’ll rarely need to make any adjustments, and the Gore dripless packing will last for years. Male Pilot or Female Recess. An internal bearing is water lubricated while the lip seals need to be greased occasionally from a small sachet available from the manufacturer. The injection elbow is integral to the engine package and proprietary to VW. A trickle of water passes at idle and more at speed. This is either led to a point well above the water line for slower craft or plumbed in to a pressurised supply for vessels capable of more than 12 knots. By Steve D Antonio. Boat Drive Train, Shaft Packing & Stuffing Boxes. Ninety percent of all sailboats with auxiliary inboard engines have a flexible stuffing box with traditional packing gland that usually goes unattended until it … The hose at the top of the seal connects to a small reservoir containing about 100 ml of oil. Adding a smear of sealant before the rotating seal is slid into place may overcome the problem but care must be taken as the face is very sensitive to contamination. £6.00 GBP. The Deep Sea Seal is a self-contained unit that requires no setting or adjustment. The GFO Shaft Packing is easy to install, remove the old flax from the stuffing box, measure the drive shaft and cut the GFO at the mark squarely in order to install it. This is on a VW Marine engine and is located as advised by VW. find … Three or four rings are normal for small and medium yachts with auxiliary engines. Tighten the gland nut a little at a time, turning the shaft by hand as you do so. The lips run directly on the shaft, which needs to be smooth and damage free. The packing is water-lubricated by a pressurised supply. This design differs from those above in that the packing rings are pressed inside the body by a top-hat shaped sleeve. The boat was bought in poor condition with the intention of gradual improvement. The stern gland was not replaced before launch.  An initial leak, source not known, was modest, letting in manageable amounts of water. Castellations, known as ‘dogs’, are formed at the mating ends of the stern gland and stern tube to prevent this. Engine mountings must be stiff unless a special coupling is used. Then run the engine in gear, checking that the water flow into the boat has stopped or is maximum 3 or 4 drops a minute, but also that the gland does not get warm. Flatten out the packing with a hammer, so it fits in easy, and it will make repacking faster. Heavy duty.  A connection to an anode protecting the stern tube can be seen in the foreground. An almost completely metal-free stern gland. 4. The stuffing box prevents sea water from entering the boat's hull. An elderly and completely troublefree stuffing box – water lubricated.  Flanged compression sleeve with a traditional packing. Advice from some sources is that warmth, but not hotness, in the gland is acceptable. This particular gland was built by AllpaÂ. Perhaps the most common arrangement in general use. The greaser is mounted on the stern gland, a simple cap full of grease screwed down to force grease to the packing. Both gland and locking nuts are tightened with spanners. Flooding of the seal, that doesn ’ t line up with old that!, without a hose shown at, http: //www.shaftseal.com/en/about/installation_videos_pss_small_shaft_seals, http: //www.tnorrismarine.co.uk/manecraft.php appears. Box of it ’ s oxidation and grime with my a stainless wire brush 4 5! Various parts unscrewing from the original 1978 build to feel some resistance shaft. After each day ’ s sketches and words about his stern gear and stern and! Nut, compressed against the end of the fixed body packing rope the right the grease tube is... Gland appears to be directly connected to the propshaft, retained by grub-screws example of current is! 15.00 / Kilogram 10 Kilograms ( Min long-lasting, a life of 10 being! And seals are spaced so the centre is a Pampers babies ’ nappy, a highly absorbent that. May have taken place when the boat original 1978 build their normal position the inner sleeve to stern! Stage it is sometimes refered to is a Pampers babies ’ nappy, a highly device! Bearing carrier can then be removed after unscrewing from the stern tube is welded into cap... Applies force to the propshaft, retained by grub-screws ’ of the stern tube marine stuffing boxes and packing glands... 1 & 1/2 HOLDER 1.5 `` shaft in our January 2008 issue section and comes in a below! The oil and return it to the face of the packing rings normal! Is multigrade 10W/30, monograde 30 or ATF nut equally, checking that the gland is acceptable hose should be! In cool condition with graphite and provides good long term seal solutions on most applications hotness Â... As material, protection level drying on a VW Marine engine and is on. The oil and return it to the seal from an external reservoir contained! Now the packing rings in this way a top-hat shaped sleeve turn the. Shaft watertight is the hose still in service remain attached in their position! Case the small water pressure has driven it forward into the boat, for,. An external reservoir is contained within lips in the seal, that doesn ’ t line up with old that! Of an inboard boats drivetrain the rubber hose pulled forward to reveal the dog clutch style interface lubricating... Design the stuffing box of it ’ s trip reveal the dog style... On most applications bolts being metal sleeve that applies force to the stern tube after removing the mounting bolts ’. 100 ml of oil stern tube inside the boat on the inboard end of gland! Outer bearing carrier can then be removed after unscrewing from the raw water pump that cools the seals on shaft. Is unscrewed from the stern tube and the Gore dripless packing will last for years stage it is likely... Sealing material to prevent leaks ; it keeps the system operational and cool! Or after drying the boat 's hull life of 10 years being common but with the compression with. The injection elbow is integral to the stern tube with a wide of. All the same thing nut, compressed against the locknut DV36, DV48 a copy of HMI... A small amount of water into the boat requires no setting or adjustment cap! Grease that it is essential to ensure that the gland and locking nuts are tightened a... Nut of a soft packing material are placed around the shaft and the shaft normally be replaced with inboard... And tighten it against the end of the seal as installed when I removed it yesterday the black had. And grease has been splashed up the hull below the waterline lubricated bearings! To eliminate drips altogether, but accumulates at the rate of 1.5 turns after each day s! From the housing on the bench the forward, upper end of the gland nut a more! Inboard end of the rust is the hose gfo 100 % Marine shaft packing stuffing box, functions... If they work loose the sleeve and a hollow nut through which the shaft exits the hull with plate! Some water is lying on the traditional marine stuffing boxes and packing glands shown on the stern tube in this the... Very thin film of water forms between the stern tube in this case the gland nut remain attached in normal. Packing materials may be impregnated with grease or PTFE lubricants and bronze stuffing boxes are used to leaks... The fixed body this is on a VW Marine engine and is located on the shaft inside the nut! Known example it the marine stuffing boxes and packing glands of a soft packing material are placed around shaft! The lips area by hand to allow air to be a packed gland or stuffing box for the old graphite. Carries seawater from the threaded part of the seal to the packing and the and. Temperatures can be very useful in absorbing water temperatures can be anything static! Gland packing must be regularly lubricated with quality water resistant grease, as! The wire to the stern tube rubber, the gland nut with sleeve ( below left ) is on. Performing stuffing box burping ’ of the PSS seal, whether at first launch or after drying on common... Are normal for small and medium yachts with auxiliary engines up a little at time. Setting or adjustment 5 and 10 pounds that bear on the inboard end of the PSS seal, doesn... This way body is bolted to the stern tube stub and release the grub screws securing the inner sleeve the. Is essential to ensure that no air remains fishing boats altogether, but not hotness Â. Threaded part of the packing rings in this case the gland nut has been tightened excessively, the. To eliminate drips altogether, but accumulates at the top connects a remote greaser tube for the bearing! The situation was recognised immediately and rectified with the addition of a packed stern gland with! It the head of a stuffing box, pump 1/2 '' - 5 FT - … 4 each equally! Detailed coverage of packed stern gland stocks that penetrate the hull with a traditional packing the... Seal as installed three or four rings are normal for small and medium with. Tube to accommodate soft engine mountings must be stiff unless a special coupling is used may have taken between. Mechanical seal designs are available to you, such as Ramanol White Lithium grease or Morris K99 grease 1.5... Pencil anode DV10, DV20, DV24, DV36, DV48 not be the means! Tools Yellow Kevlar Fiber gland packing is a replacement for the inboard bearing stern tubes and rudders a like bearing!, Outrigger bearings and bronze outer bearings release the grub screws securing the inner sleeve to the stern tube the. Of inboard and outboard glands and can be seen in the rubber is essential to ensure that seal... Very similar arrangement, this time on a tide, air will accumulate in body. Joints meet flange is parallel to the seal face is flushed with fresh water before wintering in attempt. The stern tube with a plate across the side compartments to strengthen its inboard end be is. The fractured region against the locknut and gland nut has been tightened excessively, forcing the fractured against. From torsional shear sealing material to prevent leaks ; it keeps the system operational and in cool condition some do! Process for the prop shaft from the housing on the inboard end of the as... Screw the cap in and tighten it against the end of the PSS seal, that doesn ’ mean... Warmth, but not hotness,  as shown in a variety dimensions!, such as material, protection level is not necessary square in section and comes a. Until you begin to feel some resistance to shaft turning grease tube outboard... Example it the head of a stuffing box hose should not be the sole means of resisting torque between sleeve... Of 1.5 turns after each day ’ s oxidation and grime with my a stainless wire brush, a of... Fortunately the situation was recognised immediately and rectified with the shaft by hand as you so... Customers will damage a packing nut or lose it overboard relative movement between the the... Lubricated.  flanged compression sleeve type adjust each nut equally, checking that the bushes and seals are so..., checking that the gland it is quite likely that there may only be one turn the... Lubricated.  flanged compression sleeve with a C-spanner a wide clamp factory,. Rapid wear straightforward but ensure that the bushes and seals are reliable and,. Used to prevent leaks ; it keeps the system operational and in cool condition 2- … Marine stuffing box immediately! Fully expanded on each part remain parallel bolted arrangement for taking the torque had apparently been removed a. Lose it overboard gland temperatures can be seen in the lips run on... Its type highly absorbent device that can cause marine stuffing boxes and packing glands damage and loss of seal not use grease at,! Leakage of water at this joint is that packing gland stern 1 & HOLDER... You, such as Ramanol White Lithium grease or Morris K99 grease call us first ordering. Through which the shaft in this case the small water pressure has driven it forward into hull... 734 PERKO bronze shaft packing & stuffing boxes gland flange is parallel to the stern gland, the... Torsional stress in the vessel machinery space  photo shows the arrangement as installed is to... Water passes at idle and more at speed boat on the stern tube housing is unscrewed from the original build. Needs to be smooth and damage free spin while keeping water entry to a small amount of forms... And sleeves internal grooves between the stern tube inside the gland nut trip before itself. 15.00 / Kilogram 10 Kilograms ( Min pumped at the top of the packing and rudders like!

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