Wot, no gasket? (B50 crankcase halves)

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Roger
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Wot, no gasket? (B50 crankcase halves)

Post by Roger » Tue Jul 19, 2016 2:31 am

So here's a pic of the alternator side inner crankcase cover removed. It looks in okay shape. Bearings seem smooth, but should I replace them anyway? (Engine has 3000 miles on the tach.) And I don't know what the marks are on the interior surface, looks like someone was bashing it with a hammer!

Question then is what is the brown gunk on the edges? There was no gasket, and there's none in the parts book, so I am assuming this is some kind of sealant. If so, can someone advise accordingly? Do I need sealant, and if so could you suggest a suitable product? Thanks as always.
30bf8274-2d37-474d-936a-636a3bbb1328.jpg
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Re: Wot, no gasket? (B50 crankcase halves)

Post by Barry Creary » Tue Jul 19, 2016 4:12 am

image.jpg
don't know what would course the marks but I replaced all bearings just in case :roll: it's a lot of work striping down again if a bearing needs replacing and there's no gasket I used loctite 518 and faced all flanges with fine wet and dry on a thick piece of glass as explained in the rupert ratio book and have no leaks so far :uhu

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Re: Wot, no gasket? (B50 crankcase halves)

Post by Malcolms Lad » Tue Jul 19, 2016 6:18 am

I also used 518 everywhere but use grey loctite RTV for the crank cases the number escapes me now but will check when I get home. No leaks yet......
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Re: Wot, no gasket? (B50 crankcase halves)

Post by BSA_WM20 » Tue Jul 19, 2016 9:29 am

Back in the day you ran a single thread of silk around the joint.
Now days it is 581 with a single thread of silk.
Gaskets muck up the end float on vertical split motors.
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Re: Wot, no gasket? (B50 crankcase halves)

Post by Roger » Wed Jul 20, 2016 4:32 am

Barry Creary wrote:
image.jpg
faced all flanges with fine wet and dry on a thick piece of glass
I saw that in the RR book. I guess if I have got this far I might as well do that as well. It seems straightforward enough!
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Re: Wot, no gasket? (B50 crankcase halves)

Post by Barry Creary » Wed Jul 20, 2016 5:12 am

Worth the effort Roger if you want a leak free motor :uhu

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Re: Wot, no gasket? (B50 crankcase halves)

Post by Roger » Wed Jul 20, 2016 1:16 pm

Barry Creary wrote:Worth the effort
Yup! Added to my to do list!
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