SOHC.co.uk Forums > CB350/400
Starter Motor Oil Seal
Oddjob:
I think the question you should be asking is WHY has it failed. To fail I'd imagine the bush in the outside of that part of the casing has worn, this allowed the shaft to oscillate, this must have worn the seal away.. So IF that's happened fixing the seal is just a band aid. Maybe think more about replacing the end cap on that end. Fix both problems at the same time
McCabe-Thiele (Ted):
Just my thoughts on the matter. The starter motor shaft is stationary except when you press the starter button. Iirc the starter motor shaft is a pretty snug fit when the external O ring is in place. So how is oil getting past the first line of defence when the shaft is mostly stationary?
I can imagine that if the starter end plate/ bearing is worn then an oval orbit might cause seal wear in the long term so what has caused the starter wear?
Oddjob:
There is another possibility which has just occurred to me, the seal is a forward facing lip seal, IF the seal has flipped in that the lip is now facing into the motor that may allow oil to get past it. I think you need to remove the end cap and check.
McCabe-Thiele (Ted):
Is it possible that the starter clutch has not been working correctly causing the starter motor to rotate with the engine for prolonged periods before disengaging?
That might explain why the brushes have been replaced recently and why the end plate has worn or is this not possible?
Matt_Harrington:
--- Quote from: Oddjob on October 27, 2023, 06:26:15 PM ---Oring is on the outside, the seal is on the inside Matt.
--- End quote ---
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