SOHC.co.uk Forums > CB500/550

Oil leak from points cover.CB550.

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andy120t:
Is it possible to have a leak from the points cover?. I have an engine in the bike that I haven't run, beyond briefly firing it up - bike had the oil topped up and was happy sitting on the side stand but when I propped it up more vertically ( wood under the side-stand) I found a puddle of oil.

Are their seals that could leak, and if so, are they easy to replace without major surgery?!

taysidedragon:
The only oil seal behind the points is the crankshaft seal, if that's leaking it's an engine split to replace.

SteveW:
You could try Wynns Stop Leak, it’s supposed to revitalise seals. Worth a try for about a tenner.

It slowed my output shaft leak on my 650.

Oddjob:
Remove the points plate and you can see the crank seal, as TSD has said it's normally a split the cases job to replace, that's because it's lipped on it's outer edge. First off you need to make sure it's that that is leaking, it could be the crankcase sealing itself. You could possibly get away with removing the seal, if it is that, and removing the lip off a new seal and driving it into place, it may work and for the cost of a new seal it may be worth trying first. However that's not without it's risks, the seal is very close to the crank shells and if you hit those you're in a lot of trouble. It has been done though.

andy120t:
Thanks all - that's a start and some useful pointers! I've been mulling it over and looking at parts diagrams over the winter  - I'll investigate properly when the temperature rises a little bit more and the garage is a little more hospitable,!

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