4-6 psi is about right for mine. If you have a dripless shaft seal (i.e. Some dripless shaft seal products use set screws to hold the rotor in place. It’s also a good idea to make sure your shaft seal is shielded or protected from heavy items that could fall on it (wrenches, hatch covers, etc.). 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. Its not oil pressure, as the seal only see's splash, and not real pressure. 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. An inboard shaft seal, also known as a "stuffing box," allows the propeller shaft to exit the boat and rotate, all while keeping water on the outside of the boat.While drive shaft seals appear inconsequential, they're a crucial part of a boat's underwater hardware and drivetrain system. Drip-proof shaft seals such as the P.S.S. The SureSeal supports propeller shaft sizes ranging from 1 … The quality of material used in dripless shaft seal bellows has improved quite a bit over the last few years. Another important component to inspect on your dripless shaft seal is the stainless rotor. They said they're going to have to pull the prop, rudder and prop shaft to get to it. I was able to pinch the tube off with vise grips and stopped the issue, but not before 20-30 gals of water was in the bilge of the boat. Left unattended, the line will melt into a solid blob and can cut into the seals around the shaft, allowing water to leak in and gear lube to leak out. 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. The Lasdrop DrySeal is a compact, economical lip seal designed for quick and easy installation. Alright so my 10' 22 launch has started to leak! If the carbon face seal needs replacing (some can be refaced), you will need to haul your boat and pull the shaft from the coupling so that the replacement can slide onto the end of the shaft. Some cracks and chips are obvious, but some can be hard to see with the naked eye even under ideal lighting conditions. He is a graduate of Maine Maritime Academy and former Lieutenant in the US Navy Reserve. 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. A previous owner had rubber sleeves put over both shafts to keep the spray damage under control. The most-common cause of minor leaking is foreign material between the stainless steel rotor and the carbon flange a grain of sand or a blade of grass can break the seal. It happens more often than you might think. Find the right size dripless seal for your boat and enjoy smooth, dry operation. The same warnings come with these lower unit seals as well. No Dripping, Leaking or Spraying of sea water into the bilge as the conventional “stuffing box” – cruise without concern of the packing nut or check nut loosening.. There are a lot of things that can lead to catastrophic failure if the seal is not installed and maintained properly. All apart you will take on some green water but it will rinse the seal area of crud. The deal on my 1979 C&C 30 looks like it's going to be finalized tomorrow. Traditional bronze stuffing boxes are now to fail too, but the consequences are usually less severe. The most difficult components to properly inspect on a dripless shaft seal are the nitrile o-rings under the stainless rotor. In most cases a stainless-steel rotor is slid on to the propeller shaft and fastened using nitrile rubber o-rings and set screws. R.E. If this is not done, the shaft seal will get hot quickly (without water contact) and destroy itself. This is done by pulling the rubber bellows slightly to let water push the air inside the seal out. Be sure to follow the manufacturer’s directions carefully on how far to compress the bellows during installation. Lasdrop 1-1/4" DrySeal Shaft Seal. When a shaft is rotating very fast, it can be creating a very fine mist of salt water spray. To help solve this problem, some owners will have a shaft zinc fitted just forward of the rotor to help hold it in place in case the set screws fail.

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