SKU: 61537436956

PSS Shaft Seal 3" Shaft - 5-1/2" Stern Tube

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Description

PSS Shaft Seal 3" Shaft - 5-1/2" Stern Tube3" Shaft 5 1 2" Stern Tube The PSS Shaft Seal is the #1 selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds most reputable boat builders and boat yards. The PSS Shaft Seal is also recognized as the premiere retrofit (aftermarket) seal on the world market. Boat builders and boat yards recognize the advantages and value of installing the PSS as it eliminates the maintenance, constant adjustment & cost

3" Shaft - 5-1/2" Stern Tube

The PSS Shaft Seal is the #1 selling marine mechanical seal worldwide and is installed as standard equipment by many of the worlds most reputable boat builders and boat yards. The PSS Shaft Seal is also recognized as the premiere retrofit (aftermarket) seal on the world market. Boat builders and boat 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. 

How Does it Work?

1. Two nitrile o-rings seal the stainless steel rotor to the shaft and will not experience wear.

2. A primary set screw and a backup set screw (2 sets) are used to secure the stainless steel rotor to the shaft.

3. A seal is created between the two flat surfaces of the carbon stator and the stainless steel rotor.

4. Water is fed into the PSS Shaft Seal for cooling/lubricating the seal faces on high speed vessels.

5. The stationary carbon stator is attached to the nitrile bellow, which is attached to the stern tube (shaft log).

Rotor

The PSS stainless steel rotor is slid down the shaft and is secured to the shaft with set screws at 90° for maximum holding power. Precision tolerances are maintained by computer controlled lathes. The faces have a number 9 micro finish and are perpendicular to the bore to prevent run-out as the collar rotates. The carbon graphite stator will polish the face of the rotor during the first few minutes of operation. The stainless steel rotor should not need to be replaced under normal operating conditions. The stainless steel rotor used on the PSS Type A Shaft Seal is made from 316L stainless steel. 

Carbon Stator

The high density, resin impregnated carbon/graphite stator is a composite that is first mixed, molded and then formed under pressure. The blanks are then baked, machined and lapped. The face of our carbon is finished to a flatness of 4 helium light bands (measured .000044" of variation over entire lapped surface). The grade of carbon used in the PSS has an operating temperature over 500° Fahrenheit (+260° Celsius), and cannot melt if the seal runs dry, unlike a rubber lip seal or plastic face seal. The high density of the carbon greatly increases the longevity and wear resistance. Several commercial vessels have recorded over 40,000 (over 4-1/2 years of continuous operation) engine hours on the same, original components. The carbon should not need to be replaced under normal operating conditions. 

Bellow

The PSS Type A Shaft Seal bellow is made from rubber (Nitrile), and has a temperature rating of -25°F to +225°F (-31°C to +107°C). Nitrile is known for its resistance to weathering. Nitrile rubber is exceptionally resistant to oils and non-polar solvents. It also offers good gas impermeability, abrasion resistance, and better thermal stability than most general purpose elastomers. 

Hose Barb

For high speed vessels it is required that a positive water supply be plumbed to the PSS Shaft Seal for the purpose of lubricating and cooling the seal faces. There are many sources of water supply, review the PSS Shaft Seal Installation Instructions for more information and note all plumbing must follow the standards and practices of proper boat plumbing. In most cases a slow speed boat that does not have a bearing the shaft log does not require positive water feed and can simply be "vented". Ideally the vent line will be run at least 2-3 feet above the water line and is close to the center line as possible to ensure the vent hose is never below the water line, even if the boat heels. Review the PSS Shaft Seal Installation Instructions for more details on venting the seal.

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SKU: 61537436956

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Brandywine
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★★★★★ 4
Looks great!
My son loves these shelves. He wants more!
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Reviewed in the United States on October 9, 2025
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misaebee94
Fort Morgan, US
★★★★★ 5
Husband loved it!!
Got this for my husband on Christmas and he absolutely loves this. The instructions were straightforward on how to build and it took less than an hour to assemble. The lights are pretty cool. They change different colors and there's different settings with the remote. I will say he did have to nail these to the studs in the wall so it can hold his hefty drinks LOL
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Reviewed in the United States on January 29, 2025
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C. B. K.
Dallas, US
★★★★★ 3
A royal pain to install
The width of this item is such that it CANNOT be attached to the wall studs. That is unsafe for something that is intended to hold heavy items like liquor bottles. THEN the anchors that come with it are flimsy so we used a heavier different style anchor (threaded). That said, I like the way it looks, and the light effects.
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Reviewed in the United States on January 4, 2025
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Trevor Deemer
Battle Creek, US
★★★★★ 5
New Bourbon Shelf
I just got done putting it together and hanging it on my wall. It took approximately 35 minutes to put together and another 15 minutes to hang up. I had to use my own larger wall anchors and screws. I tried the ones that came with it but they didn’t do the job. I am happy with it other than that. Good value and quality materials. As you can see from the picture it holds several bottles and room for more if I want. I think the LED lights look great as well.
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Reviewed in the United States on April 18, 2025
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Amazon Customer
Phoenix, US
★★★★★ 5
Mocks dispensational viewpoints on key Thessalonian chapters.
Format: Hardcover
Very good read. You really walk away feeling like an expert in the Thessalonian Epistles after reading this book because Weima always is searching for theological answers to the questions that arise within the Epistles themselves. You really see the deep unity of Paul's purpose in writing these epistles after reading this commentary. The only problems for me where I did not agree with Weima's conclusions was on dispensational issues in 1 Thess. 4 and 2 Thess. 2. Weima rejected the idea of the rapture without dealing with it at all and then proposed the idea that its talking about a "Hellenistic reception" of a king coming into a city. I don't get it, Weima thinks we do go to the sky meet the Lord in the air and then lead him to the earth, it's so preposterous. It seems like God is in control of this event not man leading Christ to the earth. If he wants to criticize the rapture 'which yes I do believe.' Make your argument. But instead Weima just says things like "so called rapture" without refuting it with logic at all. And then in another eschatological text in 2 Thess. 2 Weima rejects any kind of a literal interpretation and says "We can't actually believe that the Anti-Christ actually goes into a rebuilt Jewish temple as some dispensationalists believe." I'm paraphrasing Weima's words. Weima flat out rejects any dispensational viewpoints on these important verses and doesn't deal with them at all like he does other viewpoints. Other than that I think this was a great read. Highly recommend the book.
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Reviewed in the United States on February 28, 2016

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