PSS Shaft Seal 1-1/2" Shaft 2-1/2" TubeShaft Diameter: 1-1/2"
Stern Tube Diameter (D): 2-1/2" to 2-5/8"
Total Length (A): 9.175"
Total Length (compressed) (Compressed A): 8.175"
Rotor Diameter (B): 3.75"
Carbon Cuff Diameter (C): 3.25"
Stern Cuff Length (E): 2"
The PSS Shaft Seal is the number one selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds most reputable boat builders / yards. The PSS Shaft Seal is also recognized as the premiere retrofit (aftermarket) seal on the world market. Certified by Bureau Veritas, ABS & Rina: Boat builders / yards recognize the advantages and value of installing the PSS as it eliminates the maintenance, constant adjustment & cost associated with traditional packing type glands. Aside from these benefits, the PSS Shaft Seal helps to eliminate water in the bilge (100% water tight) & wear to the propeller shaft. The PSS Shaft Seal can be easily retrofitted and is available for shafts ranging from 3/4" (20mm) to 6" (150mm).
The PSS Shaft Seal is a mechanical face seal that is created between the flat surfaces of the rotating stainless steel rotor and the stationary carbon flange. The stationary carbon flange is attached to the vessels stern tube with hose clamps and the carbon flange is attached to the front side of the bellows with hose clamps. The stainless steel rotor is fit on the shaft in front of the carbon flange. The stainless steel rotor is used to compress the bellows before the collar is secured to the shaft with set-screws. This compression (pre-load) maintains contact between the faces and allows the PSS to compensate for the thrust from the propeller. The carbon flange is bored larger than the shaft diameter allowing it to "float" around the shaft and thus compensate for most misalignment and vibration problems. The stainless steel collar is sealed to the shaft by two o-rings that are recessed into the bore of the collar. These o-rings rotate with the shaft and stainless steel rotor and do not experience wear during operation.
**As with any rubber hose below waterline, the PSS bellows must be inspected on a regular basis for any sign of wear, aging or chemical deterioration. PYI suggests as preventative maintenance that the PSS bellow be replaced in six year intervals. During bellows replacement it is recommended the o-rings & set screws in the stainless steel rotor also be replaced."
Bellows may need to be more frequently inspected in an environment where non-sealed batteries emit sulfuric acid. Sulfuric acid vapor will accelerate rubber deterioration, as will an ozonater.
The Maintenance Kit includes the items you need to properly maintain your PSS Shaft Seal. Included in the kit is one (1) PSS bellow, two (2) O-rings, five (5) set screws, four (4) new hose clamps and an allen key.
The PSS Shaft Seal 1-1/2 inch shaft with a 2-5/8 inch stern tube diameter is a high-performance marine mechanical seal designed for reliable and maintenance-free operation. This seal features a robust construction with a rotor diameter of 3.75 inches and a carbon cuff diameter of 3.25 inches, ensuring a tight, water-resistant seal around your propeller shaft. The total length of the seal measures approximately 9.175 inches, with a compressed length of 8.175 inches, allowing for easy installation and adjustment in various vessel configurations. Its design accommodates shafts ranging from 3/4 inch to 6 inches, making it versatile for different marine applications.
The PSS Shaft Seal is recognized as the leading marine mechanical seal worldwide, widely adopted by reputable boat builders and yards as standard equipment. Certified by Bureau Veritas, ABS, and Rina, this seal is also the preferred aftermarket retrofit solution for vessel owners seeking to eliminate the maintenance and costs associated with traditional packing glands. Its installation significantly reduces water ingress into the bilge, ensuring a dry bilge environment and protecting the propeller shaft from wear. The seal's innovative design features a mechanical face created between a stationary carbon flange and a rotating stainless steel rotor, which is fitted onto the shaft and pre-loaded to maintain contact and compensate for thrust and misalignment.
The stationary carbon flange is attached to the stern tube with hose clamps, allowing for easy installation and adjustment. The stainless steel rotor, secured on the shaft with set screws, compresses the bellows to maintain a sealed environment. The carbon flange is designed to 'float' around the shaft, accommodating misalignments and vibrations, while the recessed o-rings seal the collar to the shaft without experiencing wear. Regular inspection of the bellows is recommended, especially in environments with chemical exposure such as sulfuric acid vapor or ozone, which can accelerate rubber deterioration. The maintenance kit includes all necessary components for proper upkeep, including a bellows, o-rings, set screws, hose clamps, and an Allen key, facilitating routine maintenance every six years or as needed to ensure optimal performance.
Overall, the PSS Shaft Seal offers a durable, easy-to-install, and maintenance-friendly solution for marine propulsion systems, providing peace of mind and long-term reliability for vessel operators seeking efficient shaft sealing technology.
Features:
- Shaft Diameter: 1-1/2 inch for compatibility with standard marine shafts
- Stainless Steel Rotor: Rotates with the shaft to maintain seal contact
- Carbon Flange: Provides a stationary sealing surface attached to the stern tube
- Bellows: Flexible sealing element designed for water-tightness and durability
- Pre-Loaded Design: Ensures consistent contact and compensates for thrust
- Float Design: Carbon flange allows for misalignment and vibration adjustment
- Easy Retrofits: Suitable for shafts from 3/4 inch to 6 inches
- Certified Quality: Recognized by Bureau Veritas, ABS, and Rina for marine standards
- Maintenance Kit Included: Necessary components for routine inspection and replacement
- Corrosion Resistant Materials: Ensures longevity in harsh marine environments
