Can you replace a rusted inner plate on a gas cap when it is riveted?

jimbo

jimbo

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Can you replace a rusted inner plate on a gas cap when it is riveted?

Nielsen

Thread 'stupid question about my gas cap (2013)'

Hi All: I should introduce myself. After a lifetime of old sports cars, I bought (at the tender age of 58) my first bike: a '74 Commando that hasn't turned a wheel in 12 years, but is remarkably original and in excellent nick. It was thankfully dry-stored, so once I cleaned out the carb of 12 year old fuel (the twin Amals were changed over to single) and redid the inside of the tank, it's almost ready to roll. I do have a question. The disc sealing the tank on the inside of the gas cap was very poor and I have now bought a new one. Before I wreck anything, how do I remove the old...

andover-norton.co.uk

Andover Norton - FILLER CAP (SERVICE KIT) <span class=

FILLER CAP (SERVICE KIT) <span class=
andover-norton.co.uk
 
Drill out centre of rivet, take off plate and either replace or remove rust and spray with hi zinc paint.
 
There will be a spring behind the p[late plus some other parts, you either press down with one hand and rivet with the other or use clamps to hold the plate down against the spring pressure. So when removing the plate rivet hold the plate down so it does not go flying. Once you have it apart it will be obvious, make sure the holes from breathing are at 180 so the air has a tortuous path, do not line them up.
 
I removed my rivetted plate by drilling rivet out. Tapped a suitable thread and fit a bolt with a washer. Note i did this inorder to replace the short bit of rubber tube around the rivet flange stub. It is this bit of tubing that exerts more of the sealing force against the cap gasket and tank flange. They tend to degrade after 50 yrs and exposure to modern fuels. I replaced it with a bit of ethanol proof fuel line hose.
 
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