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Hydrovane Compressor Blows A Main Seal

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seadog:
Is it definitely a metric size, Andrew? It's very close to 3/4" x 1-1/4"

Several thicknesses available here - https://www.bearingsrus.co.uk/sealing-products/oil-seal/imperial-oil-seals?p=3

awemawson:
The shaft is bang on 20 mm

seadog:
Oh well, it was worth a try.

tom osselton:
Years ago when trying to replace a seal that took a few tries I was told to wrap a oiled piece of paper around the shaft to slide the seal down.

awemawson:
Tom,

I remembered you mentioning that when I rebuilt that tractor rear wheel trumpet, I looked up the thread, and tried it on this shaft to protect the seal from the keyway. However in practise I found that I could not get the seal over the well oiled paper - (I was using a single wrap of 80 gsm copy paper)

So instead I compressed the seal against the shaft opposite to the keyway to give the bit at most risk a better chance.

Maybe I should have used cigarette paper, but I think it would be too weak - the seal is very tight on the shaft despite copious lubrication as I installed it.

The good news is that I've performed numerous deflate / reinflate cycles and had no more leaks - phew

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