B25 Inner timing cover gaskets

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*beezergeezer*
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B25 Inner timing cover gaskets

Post by *beezergeezer* » Sun Feb 03, 2019 1:50 am

:?: hi all need a bit of input ...i am rebuilding my b25ss engine and have both timing side covers off into the gearbox. I have seen some B25/ b40 / b50 gaskets for this ...As the book does not list any just a compound goo joint is this a good idea to fit them in an attempt to eliminate future oil leakage / drip drip drip..? Has anyone fitted them? If so does it affect anything such as camshaft end float crankshaft oil seal? I am assuming the extra thickness could possibly have some sort of negative effect...?? See photo of gasket..
s-l400 (1).jpg
B25 inner gasket
s-l400 (1).jpg (13.9 KiB) Viewed 870 times

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Re: B25 Inner timing cover gaskets

Post by kommando » Sun Feb 03, 2019 11:58 am

It will affect endfloat on all shafts including gearbox which can affect gear change. If you sort out the covers correctly there is no need for it.
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Re: B25 Inner timing cover gaskets

Post by minetymenace » Sun Feb 03, 2019 12:49 pm

kommando +1
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Re: B25 Inner timing cover gaskets

Post by kommando » Sun Feb 03, 2019 5:04 pm

I use Loctite 515/518 on this cover, this is after chamfering all the holes which are prone to being raised at the edges from over tightening, flattening both the cover and the crankcase faces on a surface plate and cleaning out the holes with the right tap to get all the goo out from too much silicone on previous assembly.
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Re: B25 Inner timing cover gaskets

Post by Ian Hingley » Sun Feb 03, 2019 5:47 pm

kommando wrote:
Sun Feb 03, 2019 11:58 am
If you sort out the covers correctly there is no need for it.
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Re: B25 Inner timing cover gaskets

Post by *beezergeezer* » Sun Feb 03, 2019 6:05 pm

thanks guys you are all confirming my thoughts on the gaskets...will clean surfaces thoroughly and use my tried and tested silver CT1 sealant...
just another quick question there is a felt washer listed for the final drive sprocket, part number 90-6074 there was not one fitted and can not see any obvious place for one..is it vital? what is the purpose of it ?

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Re: B25 Inner timing cover gaskets

Post by kommando » Sun Feb 03, 2019 7:41 pm

It fits on last, as long as it lasts for it keeps grit away from the seal in the clutch window.

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Re: B25 Inner timing cover gaskets

Post by *beezergeezer* » Sun Feb 03, 2019 8:19 pm

aha probably disintegrated long ago thanks.....will put one on it should last as like most of us oldies summer is best, especially in Cornwall. <216

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Re: B25 Inner timing cover gaskets

Post by tridentperu » Mon Feb 04, 2019 3:21 pm

When you fit the famous BSA felt washer you will probably have to trim it down a bit so it is not
too tight. If it is too tight it won't last very long - well, it doesn't anyway..
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