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A7 & A10 Engine
A7 1946-1950
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The BSA A7-A10 Forum
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Semi unit crankshaft oil seal
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Topic: Semi unit crankshaft oil seal (Read 415 times)
manxman
A's Good Friend
Join Date: Jul 2017
Posts: 68
Karma: 1
Semi unit crankshaft oil seal
«
on:
29.12. 2019 14:37 »
Is the 67-0674 oil seal correct for 1951-1953 A10 semi unit plunger motors ?. My parts book list no seal !!
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DJinCA
Moving Up
Join Date: Feb 2019
Posts: 37
Karma: 0
Re: Semi unit crankshaft oil seal
«
Reply #1 on:
29.12. 2019 15:13 »
As wiser men have told me, the early plunger A10s didn't have seal here, just an oil slinger listed in the parts book as:
67-349 Bearing Shim
I received help on this very subject in a thread titled Plunger A10 assembly
https://www.a7a10.net/forum/index.php?topic=14290.msg118644#msg118644
There was a recommendation to machine the case to accept a seal if it was torn down. Good advice, but due to circimstances I wasn't able to take advantage of it. I hope that this is helpful. Someone more knowledgeable than I will probably be able to offer more.
DJinCA
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AdrianJ
A's Good Friend
Join Date: Oct 2018
Posts: 215
Karma: 3
Re: Semi unit crankshaft oil seal
«
Reply #2 on:
29.12. 2019 15:56 »
Yes it fooled me. Mine is a 53 A10 but it has an oil seal where I wasn’t expecting it. Apparently the model year changed around September/October and mine has a later engine. Numbers are correct though.
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'53 Plunger Flash and Steib S500, ‘66 LE Velocette, ‘53? Winged Wheel
morris
Wise & Enlightened
Join Date: Aug 2012
Posts: 1768
Karma: 27
Antwerp, Belgium
Re: Semi unit crankshaft oil seal
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Reply #3 on:
29.12. 2019 16:29 »
SKF CR20x35x7 will fit perfectly
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'58 BSA A 10 SA
'52 BSA A 10 Plunger
'55 MORRIS ISIS
The world looks better from a motorbike
Belgium
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The BSA A7-A10 Forum
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A7 & A10 Engine
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Semi unit crankshaft oil seal