The BSA A7-A10 Forum

Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: manxman on 29.12. 2019 14:37

Title: Semi unit crankshaft oil seal
Post by: manxman 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 !!

Title: Re: Semi unit crankshaft oil seal
Post by: DJinCA 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

Title: Re: Semi unit crankshaft oil seal
Post by: AdrianJ 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.

Title: Re: Semi unit crankshaft oil seal
Post by: morris on 29.12. 2019 16:29

SKF CR20x35x7 will fit perfectly