SOHC.co.uk Forums > CB350/400

Starter Motor Oil Seal

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Bloggs:
Thanks for the thoughts to date.

Just measure shalf with the 'Best' micrometer, 13.47 Diameter.
Front bush has a small amount of wear but not very much as is the original.
Seal lip is the correect way around but seal is letting quite a bit of oil past.
Looks like a standard single lip oil seal.
Starter has been 'opened' before and the brushes are quite unworn, one almost new length.
So I guess someone fitted new brushes not that long ago.
The seal has made a very slight mark on shalf but only just detectable.

As expected it not a standard sized seal, shalf size nearest seal is 17/32" : )

I'll keep on looking.

Oddjob:
The seal looks to me to be a metal cased seal. The single lip is also quite large considering it's size.

I'll see what I can find.

Maybe whoever opened the starter last time ripped the edge of the seal?

Bloggs:
HI,

Thanks for you reply and looking for spares.
The exisitng seal Looks OK, maybe just wear on the lip and as you say it has a longish lip.
Yes it does seem to be a steel backed version.

I remember seeing ads for a Goo you added to engine oil to swell engine oil seals on older engines. Does it work and would just painting it on the seal lips add that little bit extra to seal?

Oddjob:
Easier and cheaper to just replace the starter motor

McCabe-Thiele (Ted):

--- Quote from: Bloggs on October 29, 2023, 04:28:46 PM ---HI,

Thanks for you reply and looking for spares.
The exisitng seal Looks OK, maybe just wear on the lip and as you say it has a longish lip.
Yes it does seem to be a steel backed version.

I remember seeing ads for a Goo you added to engine oil to swell engine oil seals on older engines. Does it work and would just painting it on the seal lips add that little bit extra to seal?

--- End quote ---

I think you are talking about seal Plasticisers - imho not a long term fix.
Modern ATF contains such additatives as standard.

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