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A7 & A10 Engine
A7 1946-1950
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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A7 & A10 Engine
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Crankshaft oil seal
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Topic: Crankshaft oil seal (Read 589 times)
v8ivor
A's Good Friend
Join Date: Apr 2015
Posts: 112
Karma: 2
Crankshaft oil seal
«
on:
22.11. 2015 12:08 »
Does anyone recognise this main bearing set up for a 52 A10 ? Only I cannot see an oil seal !
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muskrat
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Join Date: Jul 2009
Posts: 10787
Karma: 130
Lithgow NSW Oz
Re: Crankshaft oil seal
«
Reply #1 on:
22.11. 2015 19:04 »
G'day Ivor.
No seal in the primary side crankcase on plungers up to 1954. I'm not sure but they may have with the later 54-57 plunger models.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7
Greybeard
Jack of all trades; master of none.
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Re: Crankshaft oil seal
«
Reply #2 on:
22.11. 2015 19:41 »
Yes, I thought my '55 has a seal; didn't realise earlier models did not.
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Greybeard (Neil)
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A Distinguished Gentleman Riding his 1955 Plunger Golden Flash
trevinoz
Newcastle, N.S.W. Australia.
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Re: Crankshaft oil seal
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Reply #3 on:
22.11. 2015 21:24 »
The seal came in with the BA7/10 engines.
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KeithA
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Join Date: Oct 2015
Posts: 51
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Re: Crankshaft oil seal
«
Reply #4 on:
24.11. 2015 09:08 »
Interesting post.
How does the pre 54 engines breath from the crankcase with the piston down stroke.
Is the primary case pressurized a little as a result ??
Thanks Keith
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muskrat
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Lithgow NSW Oz
Re: Crankshaft oil seal
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Reply #5 on:
24.11. 2015 19:13 »
G'day Keith.
The breather system is the same and yes it does get pressurized a little. The only problem I've found is that when she wet sumps a fair amount of oil drains into the primary.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7
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The BSA A7-A10 Forum
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Technical (Descriptive Topic Titles - Stay on Topic)
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A7 & A10 Engine
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Crankshaft oil seal