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Fuel Cap #752043
10/09/18 12:25 pm
10/09/18 12:25 pm
Joined: Jul 2018
Posts: 67
London, UK
Ianbuck Offline OP

BritBike Forum member
Ianbuck  Offline OP

BritBike Forum member

Joined: Jul 2018
Posts: 67
London, UK
I've just reconditioned an American style tank to fit on my A65 and I need a new filler cap.

The replacement I recently bought looks like the original, but it does not seal tight against the filler opening.

The problem is the locking ring does not have a taper on the tightening edges. So it closes but when I go to tighten it with the screw top it is not pulled tight into the filler rim.

Does anyone know if a correct cap, similar to the original is available?

Ian

Attached Files 20181004_180542_resized_2.jpg20181008_102234-1_resized.jpg
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Re: Fuel Cap [Re: Ianbuck] #752071
10/09/18 3:47 pm
10/09/18 3:47 pm
Joined: Feb 2014
Posts: 1,204
Lancaster, California
C.B.S Offline

Parts Dealer
C.B.S  Offline

Parts Dealer

Joined: Feb 2014
Posts: 1,204
Lancaster, California
The repro's will do that. I add a 82-4048 cork washer under and the tends to seal it up. You can always cut a rubber seal for a better fit and seal.

Re: Fuel Cap [Re: Ianbuck] #752081
10/09/18 4:33 pm
10/09/18 4:33 pm
Joined: Jul 2018
Posts: 67
London, UK
Ianbuck Offline OP

BritBike Forum member
Ianbuck  Offline OP

BritBike Forum member

Joined: Jul 2018
Posts: 67
London, UK
That was the suggestion the supplier gave. However, I would have to glue the cork seal to the cap and I'm still not sure that it would provide a gas tight seal? I would need to experiment with various thicknesses of additional gasget as you suggest.

It may be the only solution I expect.

The other issue is the hinge pin loop is also a bit too high, so that will need bending down. Not ideal on a new aluminium part.

But needs most I suppose.

Ian

Re: Fuel Cap [Re: Ianbuck] #752083
10/09/18 4:45 pm
10/09/18 4:45 pm
Joined: Aug 2001
Posts: 4,388
Santa Barbara, California
KC in S.B. Online content

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KC in S.B.  Online Content

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Joined: Aug 2001
Posts: 4,388
Santa Barbara, California
I ran into tis exact issue some years back. Cap looked beautiful, but the wing would go past the tightest spot and release! I had posted on the fix back in the photobucket days, but lost now of course. Anyhow, I made a tool. Small block of steel <1/2" wide, cut a hacksaw slot in it. Carefully mounted the cap in a vise. YES, a vise, with cereal box cardboard, in a vertical position. Clamped on the wing stem, and the cap inner base, just tight enough to hold it against a twisting moment which was not huge force. Put the tool slot on the ramp ring and work it into a steeper ramp = a more closing downward push. You can take it off the bench and try it with a temp hinge pin a few time if need be. Mine worked almost immediately. I was, and still am very happy with the cap. Good luck.
If I ever find those pics, may repost them here.


Down to 1 BSA, 2 Triumphs, 1 '56 Chevy
Oops,.. add 1 Sporty
Re: Fuel Cap [Re: KC in S.B.] #752154
10/10/18 6:23 am
10/10/18 6:23 am
Joined: Jul 2018
Posts: 67
London, UK
Ianbuck Offline OP

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Ianbuck  Offline OP

BritBike Forum member

Joined: Jul 2018
Posts: 67
London, UK
Thanks for that suggestion KC. I tried bending the ramp just holding the cap in my hand, using some small pliers, but the steel ramp ring was too thick to bend. If I could swap the ramp rings that would be the best solution but I'm not convinced I could get that peened joint apart and 're assembled successfully .

Ian

Re: Fuel Cap [Re: Ianbuck] #752155
10/10/18 6:46 am
10/10/18 6:46 am
Joined: May 2013
Posts: 5,004
Rotherham - S. Yorkshire
Allan Gill Offline

BritBike Forum member
Allan Gill  Offline

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Joined: May 2013
Posts: 5,004
Rotherham - S. Yorkshire
The originals are really good caps and still available NOS on eBay.

Note: they do leak when new or dried out, until the felt has soaked enough fuel up to swell then itโ€™s a charm. I bought one as above to replace my leaky one, by time it arrived it had sorted itself out.


beerchug
Re: Fuel Cap [Re: Ianbuck] #753027
10/16/18 4:37 pm
10/16/18 4:37 pm
Joined: Jul 2018
Posts: 67
London, UK
Ianbuck Offline OP

BritBike Forum member
Ianbuck  Offline OP

BritBike Forum member

Joined: Jul 2018
Posts: 67
London, UK
Well following KC's suggestion I made a simple tool to bend the locking ring to form a ramp and it worked a treat ๐Ÿ˜

I held the cap a soft jawed vice, closing the jaws on the top of the wing nut and the locking ring. You can hold it quite tightly like this without any risk of damage.

I also had to bend the hinge down to fit the bracket on the tank, another easy task and then reinstall the hinge pin.

I'm vety happy with the result.

Ian

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Moderated by  Allan Gill, Jon W. Whitley 


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