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30+ years strong

The Norscot Dripless Shaft Seal has been a trusted shaft seal around the world since its introduction at the Seattle Boat Show in 1990. If you’re looking for a worry-free, low maintenance cruising experience for many years to come, we invite you to try a shaft seal known for its durability, longevity, and independent design.

See what our customers are saying…

“Extreme reliability for more than 30 years! I installed my first Norscot in my ’68 Tollycraft in 1990. In the next 15 years, we accumulated over 3700 hours and 36K miles with NO maintenance needed. When I purchased my 33′ Bayliner in 2005, putting a Norscot in was a no-brainer. Since then, we’ve put 4500 hours and 36K miles with again- NO required maintenance. The shafts are in perfect shape and the original seals are still in place. No leaks! This product is amazing!”

~ Richard, M/V Happy Wanderer

“We absolutely love the shaft seal. It is comforting to know that we don’t have to worry about leaking. I have talked with many who are always tightening their packing, etc. Great system!”

~ Jim Hocking, Owner 1990 Formula 36PC

“I will forever be thankful for your help while we were in Mexico in 2015. The new seal still seems to be working well. I hope all is well with you!”

~ Jeff Goldfarb

“It doesn’t drip or leak. I’ve had the boat for 18 years, put 1500 hours on it during that time without the need to replace the seals. Couldn’t ask for anything better!”

~ Rick, Owner of 1995 Bayliner 33′ for 18 years

“I installed new seals in my boat after having the shaft out for repairs. I put 400 hrs per year on the boat and I might go through a 1/4 cup per year. All good in western Canada!”

~ Bill Higgs

“I’ve used Norscot for 20 years- never have to worry about salt water in the engine room. It’s easy to maintain. I still love it after 20 years.”

~ Tony, Owner of 1991 Tollycraft Sport Cruiser 30 for 20 years

“A simple design, yet a burly system. I sleep well at night knowing I have a Norscot.”

~ Paul, Owner of 1976 Islander 28′ for 18 years

“I have more than 4500 hours on my Eastbay 38…all with the same seals aboard. Great product- thanks for inventing it!”

~ Tom, M/V Jo

“After 31 years, 13,000 open-ocean miles plus countless day-sails and overnighters, my Norscot Shaft Seal is still going strong. Total maintenance during those 31 years? I’ve topped off the ATF twice. No leaks. I highly recommend the Norscot Shaft Seal. No reservations whatsoever.”

~ B.B., 1981 Tatoosh 42

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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.

The “Cast Bearing Bronze” housing is made for direct replacement of a “stuffing box” and maintains concentricity of the lip seals to the shaft.

No adjustments needed! Cruise with this maintenance-free shaft seal for many years.

No water needed for cooling – Transmission (ATF) fluid lubricates the seals, shaft and bearing surfaces with almost no friction or wear. The ATF level can be visually checked in the reservoir.

The oil seals, selected for this use, have a proven history in machinery, automobiles, aircraft, etc. – there are similar seals in your boat engine, transmission, pumps and accessories. This propeller shaft seal design was developed using existing, proven technology.

Feel comfortable leaving your boat unattended for long periods of time. There will be no dripping of water into your bilge. The bilge pump will not pump oily water from the bilge, which can result in a fine.

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Installation Instructions Chapter 1 of 5

Installation Instructions Chapter 2 of 5

Installation Instructions Chapter 3 of 5

Frequently Asked Questions?

HOW LONG WILL THE SEAL LAST?

Tests have shown that 1000 hours can be expected. After that, a slight wetting of oil on the lip seals with an occasional drop can be seen. Some users prefer to put an oil absorbent pad under the seal unit to monitor any leakage.

WHAT IS THE MAXIMUM RPM THE SEALS CAN RUN?

Most propeller shafts do not exceed the RPM listed below at cruising speeds.

The lip type seals being used in the NORSCOT seal are rated at 3 times this RPM*

SHAFT DIAMETER	RPM*
1″	4071
1 1/2″	2714
2″	2035
3″	1357

DOES THE SHAFT SEAL HOUSING GET HOT?

During the first 10 to 20 hours of running the temperature could reach 150 deg. F. After run-in the temperature will stabilize at 120 deg. F. or less. The seals are capable of operating at 325 deg. F.

WHY DO YOU SUGGEST PUTTING A CHAMFER ON THE COUPLER END OF THE SHAFT?

This is standard practice for shafts using lip-type seals, so that a special tool is not required. We still advise using the installation tool that is provided, even when the shaft has the proper taper or chamfer.

ARE YOUR SHAFT SEALS KITS AVAILABLE CUSTOM SIZES?

YES. All custom Norscot Shaft Seal sizes requires a 50% deposit before manufacturing can begin. Request a Quote.

WHICH ENVIRONMENTALLY-FRIENDLY LUBRICANTS CAN BE USED IN THE NORSCOT SHAFT SEAL?

The ideal lubricant is always a light-viscosity oil. ATF is the highest performing lubricant used in the Norscot Shaft Seal and only uses 2-3 drops of ATF every 5-10 miles while the boat is running, slightly more in a heavier sea state. No fluid is used while the boat is at rest.

You can use fish oil, vegetable oil, or a biodegradable synthetic oil.

However, we cannot guarantee the performance of these alternative oils. Seals could break down sooner and the housing could run a little hotter than by using ATF.

IS THERE ANY LEAKAGE OF TRANSMISSION FLUID?

There are no two installations that are identical, but some transmission fluid (ATF) can be expected to weep out under the two rear seals. This is desired for positive lubrication of these seals. The ATF level in the reservoir could lower as much as 1″ after 100 hours of cruising.

The front seal should not “weep” or drip into the bilge for several hundred hours of running unless the shaft is worn, scratched or marred from previous use. Relocating the seal (plus or minus 1/8″ or so) on the shaft will usually remedy this.

There should be no weeping of transmission fluid when the shaft is not turning.

HOW CAN I BE SURE THE UNIT WILL FIT PROPERLY OF THE SHAFT?

After the shaft has been chamfered, de-burred on the keyway, and finished with an emery cloth per the instructions, the seal housing should be lubricated internally and slid on the shaft, making sure it slides and rotes freely.

HOW LONG DOES IT TAKE TO INSTALL THE SEALS?

The shaft seal installation takes no longer than a conventional stuffing box, and does not require any adjusting after installation.

HOW DO I ORDER?

You can view the parts & kits list with prices here

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