Several things. Heat and cold cycles and age eventually harden the rubber compound being used. It also slowly fatigues the spring behind the lip. Older leather lip seals dried up if they were allowed to sit for long periods, plus they simply wore out. If you ever look at a National Seal size catalog, there are many pages describing lip styles and various rubber compounds to use depending on the application, rotation speed, and the type of fluid to be sealed. Back when they first started using rubber seals in automotive applications, the material, Buna-N, I believe, worked well, but it hardened up after a few years. The newer rubber compounds they use today include polyacrylate and others that have a WAY longer life, and new ideas about lip designs have extended the efficiency of seals greatly. Contaminants in the fluid are also a factor in determining how long a seal will last.
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Today's Featured Article - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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