Oil seals - is there any practical difference... - Arborist Forum

Rubber coatings tend to harden or even shrink over time. They are easier to press in with less effort because the rubber deforms, I can often push them in with my bare hands. The rubber coated versions seal better in spots that have some corrosion, scratches, oil sludge, carbon buildup etc. I prefer this style for replacement when the engine or transmission is not disassembled, washed or being unable to use a proper seal driver or press.
Meatal clad seals are the stronger longer lasting version, they are less likely to pop out and seal better against the case by a stronger interference fit with the drawback of metal corrosion or dissimilar metal reactions if the seal coating is damaged. You should use a properly sized installation driver or press to install these straight and to the correct depth without distorting the seals outward metal face or the sealing lip will be distorted.
Some like to use sealants, I do not because the sealant may not bond to the case or the seal creating a leak, the sealant may not expand/contract at the same rate as the rubber or metal seals exterior causing a leak or even seal movement/looseness/dislodging. Lock tite for seals may be used to help overcome case damage or bore size irregularities to the available seals, thankfully I have not yet needed to use this personally...but life throws curveballs at every at bat it seems.

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Is there a difference between TC, TB, TCY, and SC oil seal ?

Oil seal is a device used in various mechanical equipment to prevent oil leakage and dust intrusion. They are usually composed of a metal skeleton and a rubber lip tightly attached to the shaft. There are various types of oil seals, and in this article, I will focus on four common types: TC, TB, TCY, and SC.

TC and TB oil seals are similar types of oil seals. They have a lip and a spring that enhances sealing pressure. The difference between them is that the TC oil seal has a dust lip on the outside and a rubber coating on the metal casing, while the TB oil seal does not have a dust lip and the metal casing does not have a rubber coating. TC oil seals are suitable for applications with dust or dirt in the environment, such as agricultural machinery, engineering machinery, etc. TB oil seals are suitable for applications without dust or dirt in the environment, such as gearboxes, pumps, motors, etc.

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TCY and SC oil seals are also similar types of oil seals. They have a lip and a spring that enhances sealing pressure. Their difference is that the TCY oil seal has a dust lip on the outside and a double-layer metal shell with rubber coating on both sides, while the SC oil seal does not have a dust lip and has a rubber coated metal shell. TCY oil seals are suitable for situations with high oil chamber pressure or temperature, such as hydraulic systems, compressors, etc. SC oil seals are suitable for situations with low oil chamber pressure or temperature, such as hydraulic systems, compressors, etc. Such as water pumps, fans, etc.

TC, TB, TCY, and SC oil seals are four types of skeleton oil seals, each with a different structure and function. All are internal rotary oil seals, which can prevent oil leakage and dust intrusion. However, according to the lip design and shell design, they have different characteristics and applications. By understanding their differences, we can choose the appropriate oil seal type for our equipment.

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