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Fuel tank strap fixing

Submitted by tom_mcewen on Wed, 30/01/2013
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Heavy Twins

I'm replacing the GRP Manx-style tank on my otherwise original 1957 Dommi 99 with an original steel tank. Dale says it is held down with the strap hooked under a drilled bar through which the hold-down bolt passes, originally into an (absent) tool tray. I was sent a photo of this, and I cannot understand what the bolt screws into as the tray looks a bit flimsy, and there are no lugs or marks on the frame top tubes to suggest any sort of crossbar to receive this long bolt. Also the Norvil guys have photos of early Dommis with no tank strap at all. The steel tank is shorter than the GRP one which had a special tube clamped across the frame to receive the hold-down bolt. Any suggestions?

Tom McEwen

Submitted by lionel_yexley on Wed, 30/01/2013

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Dale is partly right. At the rear end the strap has a closed loop through which is a looseround bar with a bolt clearance hole. The special long bolt, with a long head, passes through this and screws into a thread section of bar, which is mounted in a bracket bolted to the front inside edge of the tool tray. There is a spring under the head of the long bolt - which is why it is long! There is a hole in the top front cover of the tray to accomodate the bolt. This gives some movement to the tank and its rubber frame mounting. The strap also has a rubber strip on the underside.

Somewhere I'm sure I'll have a photo but you can see the round bar sections on Norvil's Parts List. Without the tool tray you will need to fix a bracket to the frame. RGM do a complete strap with fixings for the wideline and Manx tanks but they have no pics.

Cheers, Lionel

Submitted by lionel_yexley on Fri, 01/02/2013

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I've "borrowed" a photo of a rather tatty tool tray from eBay, but it does show where the bolt goes. The bracket with the threaded section that it screws into is on the INSIDE of the tray. I have circled the bolt hole in yellow and the bracket is under the front "lip" below that hole - so you can't actually see it! The lip goes at the front nearest the tank. The semicircular recesses on top are wher it sits under the cross tube of the frame.

Hope it's a bit of help.

Cheers, Lionel

Attachments Norton-toolbox-1.jpg

Submitted by tom_mcewen on Tue, 12/02/2013

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Previously wrote:

I've "borrowed" a photo of a rather tatty tool tray from eBay, but it does show where the bolt goes. The bracket with the threaded section that it screws into is on the INSIDE of the tray. I have circled the bolt hole in yellow and the bracket is under the front "lip" below that hole - so you can't actually see it! The lip goes at the front nearest the tank. The semicircular recesses on top are wher it sits under the cross tube of the frame.

Hope it's a bit of help.

Cheers, Lionel

MANY thanks, Lionel. Now I know what the missing tool-tray looks like I can start trying to find one as there's nothing to attach any bar to for the long bolt, strap, etc (which I have, thanks..) The GRP tank had a holding down bar with a nut but it has clamps for the rear shocks tubes, not the frame. Might find a secondhand tool tray. Nelson might get his eye back. Tom.

 


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