marine stuffing boxes and packing glands
A standard design stern gland but with the inboard end of the stern tube supported by a small bulkhead on a Contessa 26. Specifically dimensioned for Volvo Penta propeller shafts and sleeves. Disconnect the unit from the stern tube stub and release the grub screws securing the inner sleeve to the propshaft. Once set up and usually âadjusted twiceâ (so the stuffing box does not run hot) after re-stuffing the stuffing box, it does not drip, maximumÂ after 3 hours engine runningÂ aÂ saucer full. The reinforced hose carries seawater from the raw water pump that cools the seals and obviates the need for burping. Its primary components are a threaded sleeve and a hollow nut through which the shaft passes. It is possible to change a Volvo seal (orÂ most other types) afloat, asÂ Â this videoÂ shows.Â Not advisable without some experience of doing it in easier circumstances. by T.Norris Marine. This allows the unit to slide forward. Stuffing box 1-1/4″ Shaft Bronze. In this case there is no rubber hose. The figure obtained must be divided by 2 to get your gland packing size. – Thick wall - 3/8" (10mm) So 10mm and one jubilee clip were all that were keeping the water out,Â Tides Marine advisedÂ this was caused by overheating from running dry.Â Cause was a failure of the pressurised water feed. 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. A very similar arrangement, this time on a Moody 346. This particular gland was built by AllpaÂ. Note also the wire to the stern tube connected to an external anode and the grease tube. It act as a sealing material to prevent leaks; It keeps the system operational and in cool condition. The housing can be removed after unscrewing from the stern tubeÂ inside the boat. There is a photograph below. This provides a constant supply of cooling water to the seal so that burping is not necessary. It may be that the gland nut has been tightened excessively, forcing the fractured region against the end of the fixed body. The water feed comes from a dedicated factory tapping, on the injection elbow just after the main water injection pipe. This compresses the packing rings against the flat face of the body, shown on the right. Put the new packing into the cap, making sure the scarf joints meet. SeeÂ this linkÂ Â andÂ Â this oneÂ forÂ more detailed coverage of packedÂ stern gland repacking. Latest. Engine mountings must be stiff unless a special coupling is used. 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. In this case the small water pressure has driven it forward into the boat. Flatten out the packing with a hammer, so it fits in easy, and it will make repacking faster. Rings of a soft packing material are placed around the shaft inside the gland nut. Once fully tightened the packing rings are compressed within the body. Aohong Marine Stuffing Boxes Rope Packing Gland Packing Extractor Tools Yellow Kevlar Fiber Gland Packing . The Gore GFO Packing will last for years. C $97.10. TheÂ 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. Duramax Ultra-X comes packed standard on spools of: 1, 3, 5 and 10 pounds. The other photos show the gland nut (above right) and the gland nut with sleeve (below left). Graphite cotton gland packing is a replacement for the old traditional graphite asbestos packing rope. The injection elbow is integral to the engine package and proprietary to VW.Â A trickle of water passes at idle andÂ more at speed. This HMI seal was installed in 1998 and has performed very well.Â Replacement of the seals was low cost and preferred to fitting a new shaft seal. December 4, 2008. These are used on stern tubes and rudders a like. 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, inÂ this case it is 3/8â wall x 3â longÂ Â Â Â Â Â Â Â Â (available from T Norris & Co). 2- … Crevice corrosion has occurred between the stainless steel and the graphite fixed face. US $12.54-$15.00 / Kilogram 10 Kilograms (Min. Cutless bearing carrier at the outboard end of the stern tube on the traditional boat shown on the left. This reservoir is mounted at above normal sea level,Â providing a small positive headÂ to counteract the pressure of water acting on the other side of the gland. This design differs from those above in that the packing rings are pressed inside the body by a top-hat shaped sleeve. 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. An elderly and completely troublefree stuffing box â water lubricated.Â Â Flanged compression sleeve with a traditional packing. At this stage it is quite likely that there will be no water drips at all. Seals generally used on: Working and fishing boats. The lip seals bear on a highly-polished stainless steel sleeve that fits over the propshaft, retained by grub-screws. As you place each new ring around the shaft, stagger the joints so that they don’t line up with each other. Perhaps the most commonÂ arrangement in general use.Â The greaser is mounted on the stern gland,Â a simple cap full of greaseÂ screwed down to force grease to the packing.Â Both gland and locking nuts are tightened with spanners. – Textile Reinforced Hose. However, that doesn’t mean our products don’t need replacement parts from time to time. Marine Propeller or Rudder Stuffing Box Model 1788 Water Lubrication with Emergency Air Seal: 2 1/2 to 15 inch (larger on request) Packing Gland - Stuffing Box. Keep tightening until you begin to feel some resistance to shaft turning. The initial action is to tighten the packing to take up any leakage. Available in 18 Standard Sizes. A copy of the HMI shaft seal instruction manual is helpful. Stuffing / Packing Boxes for Sale at Go2marine. Excessive greasing can cause packings to run hot. Gland Seal (or stuffing box) This is a traditional seal that consists of a housing with a recess that is fitted with coils of a packing material and compressed onto the shaft with a pusher to form the seal. Another make, this one labelled BMW. 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. In this case the dogs were not engaged and the rubber hose was subjected toÂ torsional shear, which resulted in its failure, Use of general purpose hose rather than the special one made for the purpose. There is normally no bearing on the upper end of the stern tube in this design. Stuffing boxes are also called stuffing glands, packing glands or packing boxes but they are really all the same thing. Stuffing boxes are also used to seal rudder stocks that penetrate the hull below the waterline. Has only been adjusted three times in 20 years. Further to the right the top of the gland nut can be seen around the shaft, with a security hose clip further right. The cotton material is impregnated with graphite and provides good long term seal solutions on most applications. The stuffing box is the seal around a boat’s propeller shaft that keeps the water out and allows the shaft to rotate freely. The cutless bearing can be removedÂ from theÂ housing on the bench. Tighten the gland nut a little at a time, turning the shaft by hand as you do so. Volvo seals are reliable and long-lasting, a life of 10 years being common. Description. When screwing up the gland it is essential to ensure that the gland flange is parallel to the face of the stuffing box. Marine Stuffing Box Catalog The stuffing box is located on the inboard end of the stern tube in the vessel machinery space. A commonly known example it the head of a faucet. Buy It Now. PhotoÂ by The_real_jaykay, whose blog can be seen atÂ Â http://www.goodtarp.com/, Although packed glands can be wholly reliable and almost maintenance free, a range of more technical, maintenance-free seals hasÂ entered the marketplace in the past 20 years or so. 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 … REPLACEMENT ZINC PENCIL ANODE Three or four rings are normal for small and medium yachts with auxiliary engines. A wide variety of marine stuffing box options are available to you, such as material, protection level. In many designs the outer bearing housingÂ is unscrewed from the stern tube after removing the mounting bolts. A small leakage, perhaps one or two drops per minute when the engine is running, is sometimes advocated as desirable.Â My own experience is that it is perfectly possible to achieve no drops into the boat without overheating of the gland. Release the prop shaft from theÂ gearbox coupling to free the unit.Â The centre housing can be slipped out of the rubber bellows by releasing the two clips.Â The seals and brass bushes are a very tight sliding fit within the casing, secured with Loctite.Â Replacement seals are standard items widely available, from e.g. Packing materialsÂ may beÂ impregnatedÂ with greaseÂ or PTFE lubricants. The digital temp display was mounted in my cockpit. It is necessary to ‘burp’ the seal, compressing it in the lips area by hand to allow air to be dispelled. In the photograph these are heavily worn: 2-3 mm longer when new. Two examples of this problem are known. £6.00 GBP. By Steve D Antonio. Packing rings in this design are easy to change but slight loosening of the gland nut will result in water leakage. 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. The PSS seal works on the same principle as the mechanical seal in a centrifugal pump.Â The fixed face is aÂ ring ofÂ carbon (graphite) material, spring loaded by the elasticity of the rubber bellows. The locking ring is in the centre. AÂ Halyard seal. TheÂ hose at the top of the seal connects to a small reservoir containing about 100 ml of oil. Simply Bearings.Â Re-assembly is straightforward but ensure that the bushes and seals are spaced so the centre sleeve is constrained within the seals. Some installations do not use grease at all, a positive water supply to the stern tube being substituted. Rings of a soft packing material are placed around the shaft inside theÂ gland nut. Stuffing Box Gland Packing. The lips run directly on the shaft, which needs to be smooth and damage free. The source of the rust is the carbon steel washers. Alibaba.com offers 198 marine stuffing box products. Brand New. Advice from some sources is that warmth, but not hotness,Â in the gland is acceptable. You’ll rarely need to make any adjustments, and the Gore dripless packing will last for years. Accidents happen and occasionally our customers will damage a packing nut or lose it overboard. The traditional method for keeping the propeller shaft watertight is the packed gland or stuffing box. We manufacture and supply most types of inboard and outboard glands and can build stern gear and stern tube assemblies to your requirements. For illustrative purposes I cleaned the stuffing box of it’s oxidation and grime with my a stainless wire brush. Various materials are used for the packing, traditionally flax, hemp and cotton, but more modern materials include graphite, acrylonitrile and Kevlar. Shaft logs, ‘P’ brackets, glass in epoxy tubes to … 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. The white cloth is a Pampers babies’ nappy, aÂ highly absorbent device that can be very useful in absorbing water. 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. The seal face is flushed with fresh water before wintering in an attempt to avoid a repetition. The main difference between older and current production is the vent tube. Bronze or Aluminum. ... You can now repack the gland. You could probably get by with 4 or 5 turns. From "Hands-On Sailor" in our January 2008 issue. A traditional packed gland provides the sealing. 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.Â Later models were piped this way but earlier ones were only vented.The unit was bench tested with the new reservoir arrangement. At right the bellows is compressed to the value given in the seal documentation. Release the prop shaft from theÂ gearbox coupling to free the unit. £70.48. Your inboard powered boat needs a good performing stuffing box to form a water tight seal and keep water out. Grease is pumped at the rate of 1.5 turnsÂ after each day’s trip. Â AÂ lip-seal type of gland on a boat bought in the Netherlands.Â The housing towards the camera, forward on the boat,Â is believed to contain one or moreÂ lip seals running on the shaft. 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. The length of the nut suggests that there may only be one turn of the packing material inside. The outer bearing carrierÂ can then be removed,Â as shown in a photograph below, centre. Component parts of the standard stuffing box. 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. If they work loose the sleeve can move, until on reaching its maximum point of travel a loud metal-on-metal squealing noise begins. A compression fitting on the top connects a remote greaser tube for the inboard bearing. For stern gear dimensions click here. If flow is higher but there is no temperature rise it is safe to take up a little more. The fact that grease, mixed with water to judge by its colour, is entering the boat shows the packing to be in need of taking up. Supplied complete with installation tools and a … Stuffing or packing boxes or gland let your propeller shaft spin while keeping water entry to a minimum. Volvo Penta Stern Glands/Propeller Glands Volvo Penta Stern Glands/Propeller Glands/Rubber Stuffing Box/Sealing Sleeve. Stuffing boxes are used to prevent water entering your boat. The stern gland or stuffing box as it is sometimes refered to is a much maligned piece of an inboard boats drivetrain. Invite customers to join your mailing list. The main parts of the packing are made from a plastic composite, only the bolts being metal. For shafts of size 30 to 46 mm diameter the gland packing of size 10 mm is used £29.73 postage # 734 PERKO BRONZE SHAFT PACKING GLAND STERN 1&1/2 HOLDER 1.5 " shaft . Charter. This is an older version of the PSS seal, that does not have a vent tube. I prefer no warmth at all and have always operated in this way. Some water is lying on the stern tube and grease has been splashed up the hull during motoring. Friction between the packing and the shaft causes a torsional stress in the rubber. TheÂ Radice lip seal is similar to the Volvo but with the additionÂ of a vent to overcome the necessity for burping. The diagram shows a grease nipple but various different arrangements will be seen below. Fortunately the situation was recognised immediately and rectified with the wooden plug shown in the photograph. An almost completely metal-free stern gland. Packing is normally square in section and comes in a variety of dimensions. seals for inboard glands to Water Lubricated Outer bearings, Outrigger bearings and bronze outer bearings. Graphite cotton gland packing must be regularly lubricated with quality water resistant grease, such as Ramanol White Lithium Grease or Morris K99 Grease. £226.26. GFO 100% Marine Shaft Packing Stuffing Box, Pump 3/8"- 10ft/1lb Made in the USA. Any air trapped in the seal after launching or drying out must be ‘burped’ by pushing the two faces apart briefly. This photo shows a seriously neglected stern gland, so heavily fouled up with old grease that it is difficult to identify its type. A serious problem can occur with the type of stern gland that is attached to the stern tubeÂ with rubber hose.Â Failure of the hose could result in flooding of the boat. Similar types are made by Vetus, and another was fitted as original equipment on the Albin Ballad,Â shown hereÂ http://www.ballad.no/pakkboks.htmÂ although theseÂ contain grease.
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