PSS Shaft Seal 2-1/2 inch Shaft for 4 inch Tube | Marine Mechanical Seal Replacement

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

Shaft Diameter: 2-1/2"
Stern Tube Diameter (D): 4"
Total Length (A): 9.625"
Total Length (compressed) (Compressed A): 8.375"
Rotor Diameter (B): 4.2"
Carbon Cuff Diameter (C): 3.75"
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 Part Number 02-212-400 is a trusted, high-performance solution designed for marine applications requiring a reliable seal around a 2-1/2 inch diameter shaft within a 4 inch stern tube. Renowned globally as the best-selling marine mechanical seal, the PSS Shaft Seal is widely installed by leading boat builders and yards due to its durability, ease of installation, and maintenance-free operation. Certified by Bureau Veritas, ABS, and Rina, this seal offers a significant upgrade over traditional packing glands by eliminating the need for constant adjustments, reducing maintenance costs, and preventing water intrusion into the bilge, thereby promoting safer and more efficient vessel operation. The PSS Shaft Seal’s innovative design ensures a 100% watertight environment, protecting your boat's integrity and prolonging the lifespan of your propeller shaft.

Features:

• Durable mechanical face design: Creates a reliable seal between rotating and stationary components

• Pre-loaded stainless steel rotor: Maintains constant contact and compensates for thrust and misalignment

• Floating carbon flange: Accommodates shaft misalignment and reduces vibration impact

• Sealed with O-rings: Ensures smooth rotation without wear, maintaining long-term performance

• Easy retrofit compatibility: Suitable for shafts from 3/4 inch to 6 inches in diameter

• Certified by major marine safety organizations: Ensures compliance and high-quality standards

• Comprehensive maintenance kit included: Facilitates regular inspection and replacement of key components for optimal performance

Truck Freight: No
Oversized: No