*** USE OPTION (1) TO SELECT SHAFT DIAMETER AND THEN OPTION (2) TO SELECT STERN TUBE DIAMETER ***
WARNING: [METRIC MEASUREMENT ONLY] THIS ONE IS FOR SHAFT DIAMETER WITH METRIC MEASUREMENT (MM SIZE) ONLY. IMPERIAL MEASUREMENT (INCH SIZE) WILL NOT COMPATIBLE WITH THIS ONE.
NOTE:
The Stern Tube Diameter can be with or without a reducer. For stern tube sizes marked as extendable, such as 2-3/4" - 3" (69.9 mm - 76.2 mm) , this indicates a base size of 2-3/4" (69.9 mm); by removing the reducer, it can expand to 3" (76.2 mm). Stern tube options label as "NR" signify that no reducer is included and the size is fixed.
The Type A PSS Shaft Seal is a mechanical face seal. The sealing surface 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 front side of the bellows with hose clamps, and the back end of the bellows fits over the Stern tube and is secured with hose clamps.
The stainless-steel rotor is fitted on the shaft in front of the carbon flange. The stainless-steel rotor compresses the bellows before the rotor is secured to the shaft with set screws. This compression (pre-load) maintains constant contact between the two flat faces of the stainless-steel rotor and carbon flange, allowing the PSS to compensate for the variable fore and aft movement due to propeller thrust.
In addition, the carbon flange is over-bored to the shaft diameter allowing it to “float” around the shaft and thus compensate for most misalignment and vibration problems. The stainless-steel rotor is sealed to the shaft by two O-rings recessed into the collar's bore. These O-rings rotate with the shaft and stainless-steel rotor and do not experience wear during operation.
- For further information, please refer to Product Catalogue.
- For Type A installation instruction, please refer to this PDF.
- For a comprehensive installation instruction, please refer to this LINK.
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