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Author Topic: Dumb question of the day; when to reuse a gasket?  (Read 244 times)

Offline Cursh

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Dumb question of the day; when to reuse a gasket?
« on: Nov 10, 2017, 10:36:10 »
Never? I just pulled the clutch side crank case on my CB360 and the gasket all stayed with the cover and looks to have been recently replaced. (P.O. was a honda tech. Recently probably means 2010, which was unfortunately only a few hundred miles ago) The oil centrefuge was also very clean.

Anyway, whatís the over under on reusing a gasket? (Iíve got the replacement sitting on my bench, so itís not a question of cost - more so waste)

Photo because my dumb words are only worth so much:
Love me some old shit that don't run right . . .
75 CB360 project.
73 MGB
Bicycle enthusiast.
2009 MBC Street Fixie
2016 Retrospec Folding Speck
www.instagram.com/cursh

Offline Cursh

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Re: Dumb question of the day; when to reuse a gasket?
« Reply #1 on: Nov 10, 2017, 10:37:17 »
SO SOMETIME I WALK AROUND MY MESSY SHOP BAREFOOT!  ::)
Love me some old shit that don't run right . . .
75 CB360 project.
73 MGB
Bicycle enthusiast.
2009 MBC Street Fixie
2016 Retrospec Folding Speck
www.instagram.com/cursh

Offline Ryan Stecken

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Re: Dumb question of the day; when to reuse a gasket?
« Reply #2 on: Nov 10, 2017, 10:39:19 »
As long as they donīt leak and are cracked (had cracked gaskets that didnt leak) I would reuse them.They are not like rubber seals that harden over time.

Offline Cursh

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Re: Dumb question of the day; when to reuse a gasket?
« Reply #3 on: Nov 10, 2017, 10:49:44 »
As long as they donīt leak and are cracked (had cracked gaskets that didnt leak) I would reuse them.They are not like rubber seals that harden over time.

Fast as fuque. Thanks. Iíll keep this one around for the inevitable future where I have to crack the clutch side again.
Love me some old shit that don't run right . . .
75 CB360 project.
73 MGB
Bicycle enthusiast.
2009 MBC Street Fixie
2016 Retrospec Folding Speck
www.instagram.com/cursh

Offline datadavid

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Re: Dumb question of the day; when to reuse a gasket?
« Reply #4 on: Nov 10, 2017, 11:22:51 »
Actually, you often glue one side with gasket cement so it can be reused easier, i do it on all my clutch covers, saves a lot of time and money. Klingersil ages very well.

Offline jpmobius

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Re: Dumb question of the day; when to reuse a gasket?
« Reply #5 on: Nov 10, 2017, 11:30:30 »
I re-use gaskets all the time.  It depends on the application obviously, but if the gasket is intact as Ryan mentioned, there is no reason not to re-use many gaskets.  Deformable gaskets - like head gaskets - of course should not be re-used, but even these if solid copper can easily be annealed and re-used indefinitely. I commonly assemble "paper" gaskets - like side cover gaskets - by gluing the gasket to the cover with something like 3-bond (Yamabond/Hondabond, etc) and smearing grease on the other side.  Never leaks and the cover comes off clean and easy so the gasket is not damaged.
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Online irk miller

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Re: Dumb question of the day; when to reuse a gasket?
« Reply #6 on: Nov 10, 2017, 11:53:55 »
I use Indian Head shellac to basically glue the gasket to the cover just like what you have there so you can reuse it over again.  I then paint some on the motor side when I put it back together for a nice tight seal. you can get away with pulling the cover on and off a bunch of times that way.   Always worked great on the valve covers of our VW Bug drag cars where we may need to make quick, last second adjustments


Offline teazer

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Re: Dumb question of the day; when to reuse a gasket?
« Reply #7 on: Nov 10, 2017, 15:09:55 »
Sometimes I will glue one side and grease the other side, and other times I just grease one side and let the other side stick naturally with heat. 

For clutch covers etc which will come off more often that's the only way to go. Composite head gaskets are use once and throw away, copper can be re-used after annealing.  For side covers, it's mad to keep scraping old ones off and replacing them if they are not leaking.

Offline Cursh

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Re: Dumb question of the day; when to reuse a gasket?
« Reply #8 on: Nov 11, 2017, 03:52:29 »
Madness and laziness are indistinguishable to the uninitiated.

Thanks for the insights. I'm starting to feel like I'm getting my sea legs here.
Love me some old shit that don't run right . . .
75 CB360 project.
73 MGB
Bicycle enthusiast.
2009 MBC Street Fixie
2016 Retrospec Folding Speck
www.instagram.com/cursh