Your car's exhaust system, and all of the various parts, including the exhaust manifold, are important to keeping your car on the road. Without a properly functioning exhaust system, you could

Rotaryshaft seal

The timing belt controls the camshafts in your engine, opening and closing valves at just the right time for smooth operation.

Log into our mobile app or website to book a wheel bearing replacement service today! You can book an appointment as a guest if you don't have an account with us just yet. Whether you have an account with us or not, we will need to gather a little information about your type of vehicle and its needs.

Spring energizedPTFEseals

Rotary seals are designed such that there is a static or fixed side, most commonly the outer diameter, and a dynamic side, usually the seal lip. As the dynamic surface rotates. a standard symmetrical spring energized seal may have more friction on the dynamic lip from pressure and rotation than what the outside lip can hold. In this case, the static seal lip will break loose and become the dynamic lip. This occurrence is called counter rotation.

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Spring energized rotary seals operate the same way, but with some added design features to prevent counter rotation. A few rotary seal design modifications to prevent counter rotation include:

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The “Canned” PTFE stretch formed lip seal. This rotary seal works the same as the above basic static O-ring stretched formed lip seal, but it can be installed into and “open” one piece gland and it will not pop out. This design is an assembly of two “L-shaped” metal pieces called “cans”, a Stretched Formed PTFE seal lip, and a gasket. The gasket, PTFE seal lip and the inner can are housed inside the larger outer “can” that is designed to “press-fit” into the open gland. The press fit prevents the seal from counter rotating and popping out of the gland.

Instead of using a metallic spring to press on a seal lip and create the seal barrier, a PTFE stretched lip shaft seal uses potential energy that comes from its shape. PTFE has a heating-responsive shape Memory (HRSM), meaning when stretched from its free state the introduction of heat will activate its memory and it will attempt return to its original free state shape. The PTFE seal lip is simply a flat disk like a washer where the inside diameter of the disk is machined smaller than the diameter of the shaft it will be sealing on. The combination of the bend radius created by the body of the seal and the stretch of the lip creates a wide lip to shaft contact pattern. The PTFE seal lip HRSM is activated by friction heat generated from the rotating shaft. The seal flat contact pattern lip will try to return to its smaller inside diameter free state and lightly squeeze on the shaft. The wide contact pattern and low lip force reduces the wear rate by lowering the unit loading. This allows us to seal at much higher surface speeds as the pressure variable “P” is very low in the limiting Pressure Velocity (PV) calculation (Surface velocity X Pressure) of the PTFE seal lip. PTFE seal lips have general recommended PV limit of 150,000.

Rotary seals are needed when tough application conditions exceed the capabilities of elastomeric (rubber or polyurethane) seals. Some of these conditions include:

Surface finish and hardness specifications for the dynamic surface are made much better than the static side, so that the dynamic lip will take a long time to wear out. Basically for PTFE rotary seal lips, the harder and smoother the dynamic surface the better. When counter rotation occurs, this will most certainly cause premature failure as the rotary seal is sliding on a soft and poor surface, which wears out the seal very quickly and ultimately leads to failure.

It is referred to as a labyrinth because of the path the fluid needs to take to make its way through the rotary seal. When the seal ring is spinning, the fluid it is in contact with must overcome the centrifugal force created by the seal ring it is adhering to. With each additional seal ring it becomes more and more difficult for a fluid to make its way through the labyrinth.

Then the rest is up to us! Our mobile technician will arrive on time and completely prepared to get your car up and running again. Go ahead and book a mobile wheel bearing replacement with Wrench today!

SKFPTFEseals

The Lockstep™ PTFE stretch formed lip seal: basically, it’s awesome! This design is a fully machined PTFE seal body that does not have metal “Cans” but can be installed in open glands without counter rotating or popping out. This design is part of the family of Lockstep™ Rotary Shaft seal family, so it is covered in depth on its own page.

A wheel bearing is a set of steel balls or tapers that we call "ball bearings" or "tapered bearings." These bearings are held together by a metal ring called a "race." In the center of the wheel, there is a hollow piece of metal called a "hub," and the wheel bearings fit inside the hub to help rotate your wheels.

Your typical rubber or polyurethane rotary seals are made of soft, resilient materials known as elastomers. While they can be great for some seal applications, those rubbery materials are still prone to wear quickly, simply due to their soft nature. Rotary seals by Atlas Seals are made of PTFE, a semi-rigid thermoplastic which outlasts elastomer rotary seals especially in high stress applications.

These rotary seals have a PTFE seal ring that fits into a groove on the body of the seal. The PTFE seal ring is designed with a stretch fit on the shaft in which when running the seal ring spins with the shaft. The sealing surface is now the downstream face of the seal ring that is dynamic on the stationary seal body.

Stretch formed lips seals are incredible rotary seals used in very high speed and low to no pressure applications. The lip seal is machined like a flat wash where the inside diameter is smaller than the shaft. The “flat washer lip” is stretched over a cone and packaged on a paper tube until it is installed. The stretched lip provides an excellent low friction seal that will last a long time as long as the dynamic surface is made to our specifications. If you are like us and love nerdy engineering stuff, keep scrolling to the bottom for an in-depth, comprehensive explanation on how these rotary seals work.

The static O-ring version is the more basic of the two. There is a groove on the outside of the PTFE seal body where an O-ring hangs out to provide a static seal and help prevent counter rotation. Keep in mind that this option requires a two-piece gland so that the seal can be installed, and the system pressure doesn’t just pop out.

There are many signs you should look out for if you are concerned about your wheel bearings. If you notice any of the signs listed below, you might need a wheel bearing replacement. Keep your eyes and ears alert if you suspect your wheel bearings are going bad, and let your mechanic know which signs you've noticed.

PTFEoilseal

The Lockstep™ Labyrinth Seal is incredibly efficient as it doesn’t require a two-piece gland to keep from popping out. We think it’s awesome. This design is part of the family of Lockstep™ Rotary Shaft seal family, so it is covered in depth on its own page.

Your car's wheels are very important as you won't be able to drive anywhere without them. Unless you are a mechanic or you are an avid car enthusiast yourself, you might not know how many parts go into a wheel. There is a tire, rotor, bearing, stator, and capacitor ring, just to name a few. The average car owner doesn't even know the purpose of parts such as wheel bearings, let alone know when they are failing!

To keep our customers educated about their car and its various parts, we will go over everything you need to know about wheel bearings and why they are important for your vehicle. Then you will be able to quickly identify wheel bearing problems in the future, or at least know when it is time to visit a mechanic.

In addition to the danger, it can put a lot of strain on other parts of your vehicle, such as the hub, CV joint, and transmission. If you don't repair your failing wheel bearings soon enough, you might have to spend even more money on auto repair services. You might also notice that your tires wear out faster, which will mean you will need to purchase new tires more often. Overall, all of these potential side effects of bad wheel bearings can end up being more expensive than the original problem.

The ring is the dynamic portion of the rotary seal and is made from PTFE or another durable, machinable plastic. The O-ring acts as a static seal between the PTFE seal ring and the rotary seal gland. This design, like the others, can be designed as dynamic on the inside or the outside.

Labyrinth PTFE seals and bearing isolators are clever alternatives to a dynamic positive seal. They are used in low to no pressure applications where a leak tight seal is not needed- for example, keeping an oil mist from rapidly escaping the inside of a transmission or spindle.

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The static O-ring version is a no-frills lip seal. It is basically a square cross section of PTFE with a stretched formed lip. There is a groove on the outside where an O-ring hangs out to provide a static seal and help prevent Counter rotation. Keep in mind that this option requires a two-piece gland so that the seal can be installed, and the system pressure doesn’t just pop out.

Depending on the application needs, this PTFE seal can be designed with only one seal ring or as many as needed to do the trick. Our imaginations are only limited by what is allowed by the applications hardware specifications.

If you ignore bad wheel bearings, your wheel could stop working while driving, or you could have issues steering your car.

Jun 24, 2019 — The front hub layout on many vintage cars is such that there are inner and outer bearings, each running in a race that's pressed into the hub.

PTFE shaft seal

Although wheel bearings are engineered to last the entire lifespan of your vehicle, they can break and get worn out. Most wheel bearings last about 85,000 to 100,000 miles before they need to be replaced. Some vehicles have wheel bearings that last a lot longer, and some vehicles need them replaced fairly quickly. It all depends on the quality of your wheel bearings and your usual driving conditions.

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Ptfe radial shaft sealsizes

Keep in mind that this option will also require a two-piece gland so that the seal can be installed, and the system pressure doesn’t just pop it out.

PTFE sealtemperature range

The mechanics of spring energized PTFE seals operate on essentially the same principles as other radial seals. The key difference comes from the way that they are precision machined from amazing materials and utilize clever metallic locking bars to provide a guaranteed leak-tight seal where other seals fail. We offer tons of different PTFE seals and high-performance plastics for the outer portion of our seals as well as different types of springs, which we match up with each individual order based on the intended application.

Then we will need to know what auto repair or maintenance service you need. If you know your wheel bearings have gone bad, book a wheel bearing replacement appointment! If you suspect that your wheel bearings are the cause of your automotive issues, but you aren't sure, book a diagnostic appointment and our mobile technician will take a look at your car and figure out what's going on.

PTFElip seals

In some cases, the hardware will not allow for a flanged seal gland to be used. In these cases, the simple solution is to include a groove on the static side’s surface that will house an O-ring. O-rings have higher friction than PTFE, so they grip better and can prevent counter rotation in most cases.

Looking for a mobile mechanic to replace your wheel bearings? Look no further because Wrench is here to help! We have hundreds of ASE-certified mobile technicians all over the country that have the skills to replace your wheel bearings or perform any requested auto repair or maintenance service.

The flange of the rotary seal is designed a little thicker than the counterbore that it sits in. A gland cap is then bolted to the hardware such that the thicker flange is trapped like a gasket which prevents the PTFE seal from rotating.

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Some of these symptoms of bad wheel bearings are very serious and need immediate attention. Before hopping back on the road, make sure to get your car checked out by a qualified mechanic!

Luckily for you, a wheel bearing replacement service isn't a super complicated job, especially for professional technicians. This means it won't be as expensive or time-intensive as a more severe issue. However, if you ignore this issue for too long, other parts might be affected by the bad wheel bearings, adding more repairs and costs to your final bill.

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Since your wheel bearings are located on your wheel, they need to be able to withstand harsh driving and weather conditions such as potholes, speed bumps, rain, dust, and more. All these harsh conditions can reduce their lifespan, so you should keep an eye out for the symptoms of a failing wheel bearing rather than relying on a timeline.

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The first thing we will need to know is what kind of vehicle you have. You should provide us with the year, make, and model, as well as the VIN and license plate number. This information will help us properly prepare for your wheel bearing replacement and any other services you may have requested. If your car requires a specific part, we will make sure we come with the correct tools and parts to perform all of your necessary repairs and services.

Once we know which services your car needs and what kind of car you have, we will calculate an auto repair quote for you. This quote will be personalized just for you, so you can know exactly what to expect. We will include everything from the cost of the parts and labor to the estimated time it will take to complete the services. After you have had the chance to look over our auto repair quote, you will pick a date, time, and location for your wheel bearing replacement appointment.

Unlike typical rubber or polyurethane rotary seals which have resilient (rubbery) materials, spring energized PTFE seals can use special plastics to perform at higher levels. By utilizing a separate metal spring for resilience, our PTFE rotary seals provide more consistent long term sealing force. For more details on the nuts and bolts of how they work go to the Spring Energized Seal page.

No. We don't recommend driving without a properly functioning wheel bearing. Not only is it extremely dangerous for you, but you can also end up injuring or killing other drivers on the road.