Here's a bunch of pictures I attribute to people in the internet. When we say the "lip faces...", what we mean is the end that is "gripping" the shaft, not the end that is attached to the seal body right Eddie? I know Angelo knows all this stuff but I was tripped up once because some seals also have a dust wiper or whatever it's called in addition to the main seal lip. The red seal and the light blue cross section below show that
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__PRESENT
Great additional information Neil, thanks.
But it is the opposite when filling a carrier roller with grease, when pumping grease in there has to be an escape passage. That is why there is a relief valve on the water pump housings, some owners have put a grease fitting in place of it and the grease has no place to go other than blow the seal and fill up the fan hub.
"i reject your reality and substitute my own" - adam savage. i suspect my final words maybe "well shit, that didnt work"
instead of perfection some times we just have to accept practicality
there are single double and tripple lip seals and sliding shaft seals that have a wiper to clean the shaft these are mainly used on rams the idea is the wiper protects the seal by removing dirt so it cant damage the seal itself.
rotating shafts normaly use single or double lip seals if you have a choice use a double lip seal. the seal should always have the tensioned portion facing to the side tha is wet unless it is used as a relief and a seal as rome stated about track rollers
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