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Some people should not be allowed to touch anything mechanical

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McCabe-Thiele (Ted):
I wonder if all the marks are where a replacement seal has been forced in or is it previous chain damage?

Oddjob:
There is supposed to be an oring behind the bearing and between the gear positioned there. It's there to stop oil weeping along the shaft, under the collar (which is what the seal seats on) and then coming out along the shaft again. It's either failed, perished or is missing.

SteveW:
Can’t see an o ring.

SteveW:
Looking on the cmsl website the oil seal does not have a shoulder like the original.
So in theory, if I can get the old one out I won’t have to split the case.

Oddjob:
Sorry Steve, the 500/550 have the oring so I'd have expected the 650, which is essentially the same engine, would have one too.

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