Monty countershaft oil seal

L

littletriple

New member
Location
UK
Hi all,
a quick Monty question, I have an oil weep which I think comes from the seal behind the gearbox sprocket. Can it be replaced from outside or does it mean splitting the cases? :'(  There is a steel ring visible (looks like a large washer) which I'm guessing is part of the seal & could perhaps be drilled for a couple of self tappers to pull it out?

cheers,

Martin. 
 
I?ve done this before and it worked out ok, just lube up the seal and make sure you get it in square using a large socket to help drive it in. If it does not work out well you are only back where you started minus the cost of the seal.

Robin  ;)
 
thanks Paul. Oddly, the old one is chamfered on both sides of its outer! I was very surprised at how easily the old one came out & the seal lip runs very close to the splines which appear to extend further down the shaft than they need to. New seal ordered, will see how it fits. 
 
New seal fitted today, tested & seems OK.

Tips for anyone doing this for the first time.

Old seal (original) came out very easily. The new one was tight.

The seal housing had a razor sharp edge at the entry. Best to soften this edge first or it will catch on the the new seal.

You will see a "half ring" in the lower crankcase against the bearing. The seal stops against this when fully home but only on the bottom half so the top of the seal can be pressed in too far as there is no stop there.  Be careful, you can't pull it back out!

The outer face of the seal housing on my engine wasn't machined with the crankcases together. The upper half is set back fractionally, makes squaring the seal harder than it should be...

The seal lip only just clears the sprocket splines when installed. 


cheers,
Martin.
     


 
 
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