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PSS Shaft Seal 3" Shaft 4-½" Tube

PSS Shaft Seal 3" Shaft 4-1/2" Tube

SKU 02-300-412
by PSS Shaft Seal
$910.40

Experience unparalleled performance and reliability with the PSS Shaft Seal, the industry-leading marine mechanical seal trusted by top boat builders worldwide. This comprehensive product features a range of advanced specifications and benefits to ensure your vessel operates at peak efficiency.

  • Engineered for Superior Sealing: The PSS Shaft Seal utilizes a mechanical face seal design between the rotating stainless steel rotor and stationary carbon flange, delivering 100% watertight performance.
  • Effortless Retrofitting: Easily installed on shafts ranging from 3/4" to 6", the PSS Shaft Seal is a premier aftermarket solution that eliminates the need for constant maintenance and adjustments.
  • Exceptional Durability: Certified by leading marine authorities, the PSS Shaft Seal is built to withstand the rigors of the open water, reducing wear on your propeller shaft.
  • Maintenance Kit Available: Ensure your PSS Shaft Seal remains in peak condition with the comprehensive Maintenance Kit, including a replacement bellows, o-rings, and installation hardware.

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  • PSS Shaft Seal 3" Shaft 4-1/2" Tube

    Shaft Diameter: 3"
    Stern Tube Diameter (D): 4-1/2" to 4-5/8"
    Total Length (A): 10.425"
    Total Length (compressed) (Compressed A): 9.175"
    Rotor Diameter (B): 5"
    Carbon Cuff Diameter (C): 4.25"
    Stern Cuff Length (E): 2.5"

    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.