PSS Shaft Seal 02-138-212 Mechanical Shaft Seal 1-3/8" Shaft 2-1/2" Tube

The PSS Shaft Seal 02-138-212 is a marine mechanical face shaft seal (dripless stuffing box / packing gland replacement) for 1-3/8" propeller shafts with a 2-1/2" stern tube. It eliminates the maintenance and constant adjustment of traditional packing glands. It also helps keep water out of the bilge and reduces wear on the propeller shaft.

Specifications:

• Shaft Diameter: 1-3/8"
• Stern Tube Diameter (D): 2-1/2" to 2-5/8"
• Total Length (A): 7.38"
• Total Length, Compressed: 6.38"
• Rotor Diameter (B): 2.875"
• Carbon Cuff Diameter (C): 2.5"
• Stern Cuff Length (E): 1.5"

Key Features:

• Certified by Bureau Veritas, ABS and RINA
• Used as standard equipment by many boat builders and also popular as a retrofit seal
• Easy to retrofit; the PSS line is available for shafts from 3/4" (20mm) to 6" (150mm)
• The seal forms between a rotating stainless steel rotor and a stationary carbon flange
• The carbon flange is bored larger than the shaft so it can float, compensating for misalignment and vibration
• Bellows compression (pre-load) keeps the faces in contact and absorbs propeller thrust
• Two recessed o-rings seal the stainless steel rotor to the shaft. They rotate with the shaft and do not wear in operation.

How It Works: The stationary carbon flange attaches to the vessel's stern tube with hose clamps, and the bellows connect to the carbon flange with hose clamps. The stainless steel rotor fits on the shaft in front of the carbon flange. It compresses the bellows before being secured to the shaft with set screws.

Maintenance: As with any rubber hose below the waterline, inspect the bellows regularly for wear, aging or chemical deterioration. The manufacturer suggests replacing the bellows every six years as preventative maintenance. At that time, also replace the rotor o-rings and set screws. Inspect more often where non-sealed batteries emit sulfuric acid vapor or where an ozonator is present, since both accelerate rubber deterioration.