Little information from our remanufacture. All their A6 compressors come with the double lip seal. Any play in the compressor shaft will damage the seals and cause leaks. They said you may get away if a small amount of play with a ceramic carbon seal. We just pulled the hubs off both our vendors remanufactured and ALMA new A6.
As you can see in these images the one on the left has a ceramic seal and the one on the right a double lip seal.
I have also confirmed that our you will need two different double lip seals depending on the compressor shaft.
21-34734 Ã¢ÂÂ MC-1148 measured the top of the can the ID is 18.25mm
21-34659 Ã¢ÂÂ MC-556DN measured the top of the can the ID is 15mm If a shaft is 14-15mm then you would use this seal. Anything larger you would use the MC-1148.
You cannot use the SK-771N (MC-1148) on all shafts. It is too big and it will not seal.
Mickey said that he measures the ID on the inside where the Teflon is.
MC-1148 Ã¢ÂÂ If the seal is OE it will have the GM number 6560844 stamped on the top of the can. This seal is mostly used for the late model HT/HU compressors.
21-34659 Standard Shaft "Top of can 15mm"
21-34734 Large Shaft "Top of can 18.25mm"
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