R100RT gas tank filler cap issue.

[luckyjohn]

Good morning all.
I have started a restoration on a '79 R100RT.
The gas tank filler cap and its threaded tank attachment rotate together when I try to remove the cap.
Does anybody know of a non-invasive remedy?
Thank you.
John

[Deleted User 62]

If you are saying you can't remove the cap, put a loop of rope through the handle and give it a sharp upward jerk. It should come out.

[luckyjohn]

Thanks Tim.
I'll give that a try.
The male and female halves, including the gasket, rotate together when I unscrew the cap. My gorilla-grip assistant can stop the gasket from rotating but the cap still does not unscrew.
Time to use brute force.

[dougie]

This might be of some help.
http://www.largiader.com/articles/gascap/

[SteveD]

When you get it out, see Anton's bit on the holes and putting something in there to stop the rotation. I've had caps like that for years. Occasionally it's wise to ensure the bits you put in there are still there, but it does prevent the spinning cap scenario.

[luckyjohn]

Thank you all for the links to the ratcheting gas cap removal/repair.
This crowd flat gets after it.
Many thanks.
John.

[dougie]

Thank you all for the links to the ratcheting gas cap removal/repair.
This crowd flat gets after it.
Many thanks.
John.

And now Luckyjohn you need to be lucky.