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Kick start cover oil seal.

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One minute it was OK, the next a great puddle of oil.

Traced it to the kick start shaft, ordered up 2 new rubber seals (spare just in case) and gear box gasket.

I remember looking at that oil seal when I checked over the gearbox and thinking hmmm that looks a difficult one I'll chance it.

So any tips on changing the seal, as I remember there was a bush behind it hence my reluctance to replace it. Does the bush need to come out and if so should it be replaced.

Thanks in advance.

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HI John If it is not a MK 3 just hook the old seal out with a small screw driver and replace it with a ( x ring seal  No 0.40006 from Andover Norton

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Hi John

It's worth checking if kick-start shaft Bush is oval, and needs replacing, while you have it in bits.

Happened to me, suddenly started leaking cold

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Its nothing to be worried about. If the shaft is a sloppy fit in the bush, warm up the casing and press or tap out the bush with a suitable size socket turned upside down. 

Stick the new one in the freezer for an hour then drop it in whilst the casing is still warm. Simples...

Get a double lip oil seal if possible. 

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The aperture in my alloy gearbox end cover has too large a diameter to take the standard seal.  So I have to fill the bottom of the groove with silicone before inserting the seal.  This works fine - but is it original?  Might it be because the previous owner (who I know was a good machinist) bored it out oversize to replace the steel bush?  I did consider buying and fitting a lip seal in the groove behind the bush, but I could not get the bush out (even when heated).  Also I can't remember but I think the groove is too narrow for a lip seal.  I do know that some Norton dealers (e.g. Russell Motors) used to have a milling machine set up to recess the alloy to allow a lip seal to be pressed in.

My x-ring has worked well enough for some thousands of miles, and obviously they are much easier to fit (and replace).

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Many thanks for all the tips, I will pay more attention to the bush and seal when I take it to bits, I assume the bush is original as the bike was pretty much standard. I did replace the kick start shaft and not the seal so was asking for trouble really.

 

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