I am going to replace a leaking shaft seal on my A-6 in a commercial truck. Unlike the seals I have done in the past on an A-6 the seal supplied is a rubber lip type seal not a face seal of ceramic or steel. Its been 30 years since I did one, but my concerns are this:
With the face seal, the sealing surface was replaced with the seal, where-as a lip seal rides on the shaft and can wear the shaft. I can see where a lip seal may initially provide a better (more positive) seal but my concerns are "down the road"
I notice that some mfg (MEI) still offer the ceramic or steel face seal
Where this compressor is used in a semi and run many hrs a year, far more than most cars will see in 8-9 years, do I risk the shaft on a lip type seal, and would I be better off with the old face seal? I know that the face seal will tend to leak a bit more than a lip seal, but it will not wear the shaft as it has no part that rides (wears) directly on the shaft.
Given that the A-6 is a dinosaur, and out of production, and I expect to be trucking for another 10 years or so, would I be better off with the face seal tech?
What say those that replace seals for a living? I have no inclination to replace the whole compressor with a re-man for a seal leak, and with the quality of some re-mans, when I get a good one I want to keep it.