Author Topic: crank case gasket?  (Read 502 times)

Offline Guy Wilson

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crank case gasket?
« on: 04.08. 2016 14:39 »
I'm putting my crank cases back together. Is Shellac sufficient alone or should I use a gasket as well? My British bike guru here says no gasket - only shellac
Many thanks
Guy

Offline rocker21

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Re: crank case gasket?
« Reply #1 on: 04.08. 2016 16:57 »
no gasket needed, most people use something like a thin film of wellseal or hylomar and that is good enough. make sure you get the crank end float correct before finally doing them up.

Offline Guy Wilson

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crank case gasket?
« Reply #2 on: 04.08. 2016 19:08 »
Thanks! I'm working on the end float....it seems like a black art...more questions to come I'm sure...
Guy

Offline trevinoz

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Re: crank case gasket?
« Reply #3 on: 04.08. 2016 22:04 »
I don't think that I would use shellac.

Offline rocker21

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Re: crank case gasket?
« Reply #4 on: 05.08. 2016 10:08 »
agreed i think shellac is completely the wrong thing, a decent sealer like hylomar or wellseal is fine, shellac melts when it gets hot.

Online Greybeard

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Re: crank case gasket?
« Reply #5 on: 05.08. 2016 10:39 »
...I'm working on the end float....it seems like a black art...more questions to come I'm sure...
I bought a dial gauge with magnetic mount to do this. In the UK they have become really cheap, (Chinese made I guess). Don't forget, like I did, that the gauge will be showing metric measures rather than imperial!
I had to bolt a strip of steel across the crankcase for the magnet. At 2 minutes 36 seconds on this slideshow/video https://www.youtube.com/watch?v=nrOfq1O-gV8 you can see what I did.

Offline duTch

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Re: crank case gasket?
« Reply #6 on: 05.08. 2016 10:50 »

 
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 Assuming that 'shellac' in Guys lingo is same as ours, ie: dried beetle shells, used for staining timber (in my school days)...? And not a local product that only Guy knows about *conf*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline Guy Wilson

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Re: crank case gasket?
« Reply #7 on: 05.08. 2016 10:58 »
Its the same stuff around the world I believe....brown and sticky made in America.. I'm on to the black art of end float now...my doesn't seem to have any..Ironically there was too much previously hence the con rod explosion...will it ever get put back together? I'm grabbing time between my full time job to put it all back together... !
Guy