Petrol tank cap seal material?

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Graham.Goral
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Petrol tank cap seal material?

Postby Graham.Goral » Fri Mar 22, 2019 5:47 pm

Hi folks,

My Huntmaster petrol cap has a slight leak and, on inspection, the original seal is hard and cracked. What material is best to make a replacement please? I know normal rubber will not withstand petrol. Neoprene? Silicone rubber sheet?

Suggestions please?

Cheers, Graham

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charles.bulloch
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Re: Petrol tank cap seal material?

Postby charles.bulloch » Fri Mar 22, 2019 6:07 pm

If it is a 55 tank an MZ TS 250 cap seal fits and is easily available.

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Re: Petrol tank cap seal material?

Postby roger.fellows » Fri Mar 22, 2019 7:00 pm

Ask Steve Carter!

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Re: Petrol tank cap seal material?

Postby bevanclark » Fri Mar 22, 2019 7:32 pm

I've made them successfully out of a piece of old leather. Cheers, Bevan

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adrie.degraaff
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Re: Petrol tank cap seal material?

Postby adrie.degraaff » Sat Mar 23, 2019 7:26 am

"ALI" has has blades of cork made of a single cut with no bounding material.

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pappleton
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Re: Petrol tank cap seal material?

Postby pappleton » Sat Mar 23, 2019 8:01 am

Hi Adrie,
I'm having a 'dim' moment. Tell me more about this ALI of which you speak.
BR, Paul
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Re: Petrol tank cap seal material?

Postby robjameson » Sat Mar 23, 2019 8:56 am

Cork works and is available in pre made gaskets from eBay etc.
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adrie.degraaff
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Re: Petrol tank cap seal material?

Postby adrie.degraaff » Sat Mar 23, 2019 10:07 am

You need a blade of cork becouse the bounding material of the ebay things cann't stand modern petrol.
aliexpress or alibaba.

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Re: Petrol tank cap seal material?

Postby KenGriggs » Sun Mar 24, 2019 8:42 pm

Viton rubber sheet is available. Cut a new ring of this using the original cork one as a template. Viton rubber is resistant to ethanol, whereas cork will eventually disintegrate in contact with ethanol in fuel. Google it.

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Re: Petrol tank cap seal material?

Postby Graham.Goral » Mon Mar 25, 2019 3:56 pm

Thanks guys! Will investigate the MZ tank cap seal first but mine's a '56 bike so I need to check if the '55 and 56 tank caps differ. If so then I'll look at Viton sheet, as I've had cork ones on other bikes which have not lasted very long. Thanks for all the help :-)


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