Welcome to Kiwi Shaft Seal The stainless steel Kiwi Shaft Seal™ offers protection for your vessel, keeping crew safe and dry. Check your seal’s bellow for any obvious signs of cracking, ripping, and tearing.  In most cases it’s a good idea to have a small mirror and flashlight that allows you to check the underside of the bellow that you may not be able to see due to its location in the bilge (you can also use a smart phone to make a video of the underside). Email. Here's how he did it. You can read his complete bio and the story behind this site by clicking here . Other components that can fail on a dripless mechanical shaft seal are the cooling water feed connections (barb fittings).  This is especially true on older designs featuring nylon (or similar) connections.  These connections can easily break off, become cross-threaded, or stripped.  Some manufacturers have improved their seals by replacing the nylon fittings with stainless but this is another area you need to look out for. BoatUS Marine Insurance claims files show that badly leaking stuffing boxes are responsible for one in 20 boats sinking at the dock. You can now start assembling the new shaft seal. Remove the air from the propeller shaft tube as follows: The propeller shaft seal is purged from air by pressing the seal edges together and against the propeller shaft (8). You can see the hose barb off to the side of it, which will feed it water and keep it dripless. It's something I had forgotten about until I winterized the boat for the second time (last year was my first on this particular boat) over the weekend. As a final step, double-check your work, paying special attention to the stainless-steel hose clamps, before launching your boat. Print . Or if you prefer you can watch our PSS Shaft Seal installation video. It has taken 30+ … Continue reading "Hydraulic Seals Suppliers" Adequate water flow into the shaft seal's injection pipe is critical to keep the seal from overheating, which could result in its seizing. He is a graduate of Maine Maritime Academy and former Lieutenant in the US Navy Reserve. With all the buzz around dripless shaft seals, many boaters are realizing that these so-called “dripless” shaft seals rarely live up to the marketing hype. Often, tapping on opposite sides of the back of the coupling helps. Thomas Marine Hardware’s ISB-SA Heavy Duty Bronze Dripless Shaft Seal. You can now start assembling the new shaft seal. On average, the PSS requires approximately one (1) hour of break in time, which allows the carbon ring face to polish the mating face of the stainless steel rotor. To set the correct compression, I used a piece of tape to mark the shaft when the bellows are "at rest," then use this as a reference to measure the correct compression. Looking for drip free or dripless shaft seals, SureSeal Shaft Seal, seriesOne Shaft Seal, Spare Seal Kit, Lip Seals, Smart Seal, Water Pick-Up Kits, Clamps, Fittings or Hoses from Tides Marine? 2) Loosen and remove the four nuts between the transmission and coupling. Too loose, and it will leak excessively; too tight, and shaft wear will occur. After cutting off any stainless-steel locking wire, remove the bolts or set screws that lock the coupling onto the shaft. This seemingly inconsequential piece of equipment allows the prop shaft both to exit the boat and rotate while at the same time keeping the water on the outside. One method to verify your rotor is locked in position and not moving is to take a permanent marker and mark the shaft as a reference point.  If the position of the rotor has moved in relation to the reference point, you know there’s a problem. Note that there are two screws in each of the two tapped holes, one on top of the other; the first clamps the collar to the shaft, and the second acts as a lock screw. Most dripless shaft seal manufacturers, utilize a carbon-graphite sealing face (carbon stator) that creates the actual “dripless” seal between the rotor and the stator. the seal is purged, see fig. Here's the old shaft seal with the brass compression nut and wax rope packing inside vs the new Glide GMSS seal kit, which is essentially maintenance free. irwinsailor The truth is dripless seals—either lip-seal or face-seal types—require just a little simple maintenance once or twice a year. Self-aligning shaft seal that combines the benefits of a “dripless” mechanical seal with the bullet proof reliability and performance of a traditional bronze stuffing box. And it'll come out that and then we can get the seal started and push the tool on now we can slide. Where the shaft is what is pushed through a hole in a boat to turn a propeller, the shaft seal is what is placed around it to keep the water out. Making retro fit installation much easier without the need for the additional plumbing. Be careful not to ding the end of the shaft or coupling. Tired of leaky shaft seals filling the bilge with water or having to replace the packing? The PSS dripless shaft seal from PYI works by mechanically compressing a carbon ring to “float” against a smooth steel face encircling the shaft. Lasdrop and PYI Outscore Four Other Dripless Shaft Seal Makers. Cut old seal off shaft with diagonal pliers. Even world-renowned marine mechanic and author Nigel Calder experienced a failure with his mechanical shaft seal and documented it in his book “Boatowner’s Electrical and Mechanical Manual, Third Edition”. CAUTION: If the seal has run dry use caution! In most cases a stainless-steel rotor is slid on to the propeller shaft and fastened using nitrile rubber o-rings and set screws.  Then, a carbon stator is compressed against the rotor on one side by a rubberized section of bellows that are secured to the stern tube on the other side creating a water-resistant barrier that allows the propeller shaft to turn freely. Most importantly, make sure the bellow is changed out every few years as recommended by the manufacturer. It is important to check the carbon stator thoroughly for cracks at least once a year during haul-out.  Some cracks and chips are obvious, but some can be hard to see with the naked eye even under ideal lighting conditions. Privacy Policy, 4% back on purchases from West Marine stores or online at, Discounts on fuel, transient slips, repairs and more at over 1,000 businesses. previous page: pages 1 2: next page: 09-MAR-04. If you’re boat is fitted with a dripless mechanical seal, here are a few things you should be aware of and look for to help prevent a catastrophic failure of your boat’s running gear. Now is a good time to polish the shaft with some wet/dry sandpaper. At Tides, providing excellent customer service is our no. OJ Props has developed the first dripless shaft seal that does not require a water feed from the engine. I have a question on winterizing with a dripless shaft seal. Loosen the packing-gland locking nut and the compression nut. 3. Slide the shaft toward the aft of the boat, about 10 to 12 inches. Traditional bronze stuffing boxes work well in some cases, but they can be troublesome too, or even dangerous; especially in high horsepower applications like sport fishing boats, commercial fishing boats, and Downeast style lobster yachts (picnic boats). If some lubrication is needed to assist in sliding the collar down the shaft, use a little liquid dishwashing soap. Sort by. New shaft alloys (such as Aqualoy 19 and the more common Aqualoy 22) make it even harder for the set screws to get a good bite on the shaft making them even more prone to slipping. Most of it can even be done with the boat in the water. If these are at all wasted, bent, or damaged, you may need a replacement shaft. Display. Simplan Shaft Seals For Water-Lubricated Stern Tubes . Tides Marine - Marine industry manufacturer of the dripless or drip free, Self Aligning, SureSeal Shaft Seal, Rudder Bearings, Rudder Seals and SailTrack and Slide System. In turn, the hose is clamped to the shaft tube. The concept of dripless shaft seals is great, you get a dry bilge and less vibration due to the shaft seal being able to “float” on the shaft.  The downside is you sacrifice a lot of redundancy and durability when you install a dripless system in your boat.  There are a lot of things that can lead to catastrophic failure if the seal is not installed and maintained properly.  Traditional bronze stuffing boxes are now to fail too, but the consequences are usually less severe. Do not use anything coarser than 800-grit paper. Dripless Shaft Seals by PYI and Lasdrop offer dripless operation on your boat and eliminate the need to packing and the drips that can lead to odors and the packing wear that can lead to leaks. Unlike traditional bronze stuffing boxes that utilize a packing nut or gland to compress packing material around a propeller shaft, “dripless” shaft seals utilize a mechanical sealing system to keep water out of your boat. 6. OJ Dripless Shaft Seal Installation Ski Nautique 206 with PCM ZR6. 5. Shaft Diameter Clear: Self-aligning Shaft Seal | ISB-SA Combo w/Bearing quantity. Thomas Marine Hardware’s ISB-SA system.  It combines the benefits of a dripless mechanical seal (dry bilge and less vibration) with the durability and safety of a traditional bronze stuffing box.  There’s no rubber bellow to crack or compress, there’s no stator to crack, there’s no stainless rotor to slip, and there’s no nylon hose fittings to snap off.  There’s also an intermediate shaft bearing just aft of the shaft seal that helps support (and protect) the shaft reducing the damaging effects of shaft vibration. Refit the shaft coupling onto the end of the shaft, then reconnect this to the transmission. In the midst of revising this section of the book, I found the bilge pump on my boat constantly kicking on. Take your time; persistence will prevail. Since dripless shaft seals don’t have valves to turn the water off, some boaters seem afraid to work on them, instead hoping they’ll just keep working. The blue stuff visible on the threads is a locking sealant. These are fairly simple pieces of equipment and work by compressing packing material, usually flax, against the shaft between a housing unit and two nuts (one is a locking nut) mounted on the end of a length of reinforced hose. My boat has a split coupling, but others are one piece. we respect your privacy and take protecting it seriously, We respect your privacy and take protecting it seriously, Cadet Shipping Experience on the Great Lakes: Day 26, Behavioral Based Safety Observation Programs, Cadet Shipping Experience on the Great Lakes: Day 55, PREVENTING EMPLOYEE COMPLACENCY IN THE WORKPLACE, The El Faro’s Ill-fated Decision to Head Directly Towards Hurricane Joaquin, Social Responsibilites of Merchant Shipping and Offshore Oil Companies: Part #4, Upgrading Your Boat’s Traditional Bronze Stuffing Box, Inspecting Your Boat’s “Dripless” Shaft Seal, Free Sample IWCF Supervisor Well Control Exam …, What A Trump Presidency Means for Offshore …. Boat builders and boat yards recognize the advantages and value of installing the PSS as it eliminates the maintenance, constant adjustment and cost associated with traditional type of packing glands. 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