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 - Tuning-Up Your Tractor: Oil, Oil Filter and Air Breather - by Curtis Von Fange. In the preceding articles we discussed some of the various aspects of doing a comprehensive tune up. Hopefully some light was shed on why we do or don't do certain things pertaining to inspections and order of events when doing a tune up. Perhaps some useful reasons were given for why parts fail and what to do about preventing part failure in the future. All these tips will help us think and reason out a problem in order to make our tune up last and, hopefully, keep us from spending extra mone
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