Propeller shaft seals

The most common propeller shaft sealing systems are grease lubricated. The amount of fat that ends up in the water is extremely harmful to the environment. Due to the wear and tear on your shaft bearings, shaft seals and external parts, the consumption of grease often increases over the years.

Grease-lubricated systems are usually made of bronze. Consisting of a stern tube, an inner hull with a grease-cord bearing as the inner bearing and the outer hull as the slide bearing on the outside. This system is relatively easy to convert to a water-lubricated shaft seal.

By mounting the grease-cord bearing upside down on the inner hull, a bushing is created on which a water-lubricated floating seal can be clamped.

We offer 3 solutions:

  • PSS Shaft Seal A high-quality and completely maintenance-free propeller shaft seal.
  • Stuffybox EVO This is a rubber seal with a water connection for extra cooling and less wear, needs to be lubricated once a year.
  • Stuffy BoxThe economical choice, but no less watertight. Must be lubricated annually and bled occasionally. Suitable for the more horizontal propeller shaft.

Are you looking for the environmentally friendly alternative to your always leaking grease-lubricated propeller shaft bearing?

Replace it with a Stuffy Box or PSS shaft seal!

Find more tips below!

How the PSS Shaft Seal works:
The shaft sealing surface is created between the flat surfaces of the rotating stainless-steel rotor and the stationary carbon flange The carbon flange is stationary by a heavy duty silicone bellow which is attached to the vessel’s stern tube (shaft log) with hose clamps. This compression (pre-load) maintains constant contact between the two mating faces of the stainless-steel rotor and carbon flange. This creates a perfect watertight connection.

How the Stuffybox EVO works:
By connecting the water connection to your cooling water pump via a T-piece, water circulation is created which cools the stuffy box and makes it last longer. A small amount of grease between the sealing lips in the stuffy box ensures a watertight seal.

How the Stuffybox: works:
A rubber seal consisting of two lips with a grease chamber in between seals the propeller shaft. If the pressure increases, the seal becomes tighter. Simple and effective! (Do squeeze the air bubbles out of the seal every now and then!) This has no forced water lubrication.

Can grease-lubricated propeller shaft installations easily be converted to water-lubricated installations?

Yes, they can!

Benefits at a glance:

  • Quick and easy installation.
  • Compact design.
  • Reduced maintenance to a minimum.
  • Effective functionality.
  • Long trouble free life.
  • Excellent solution for repowering.

Do you currently have a grease-lubricated propeller shaft with a grease cord?Remove the lubricating cord, turn the lubricating cord holder over and seal it with gasket paper.And then mount the Stuffybox on the smooth side of the holder.