16H valve cover stud

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Hi

i wonder if any officanardos can tell me the thread for the stud which holds on the 16H valve cover. I think mine is 1943. It has the chrome unsealed cover. Pretty sure the stud and nut C2/72 C2/73 is the equivalent in my parts book although that is what’s shown on the plate C drawing with the sealed valve cover

my engine looks like

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00DCE65D-B10B-4C94-AA30-724141156D42.jpeg

It's actually a screw on the…

It's actually a screw on the WD engines (as per civilian up to 1938). Originally a knurled screw with small holes for a tommy-bar, it evolved into the single-sided wingscrew thing that can't undo itself. It's 5/16" cycle. Quite a number of Indian sellers list them as toolbox knobs (which they were on the later boxes). https://www.ebay.co.uk/itm/Brand-New-Norton-16H-Tool-Box-Knob-High-Quality-Chromed/163420560841?hash=item260c9fddc9:g:disAAOSwAuZX358S The part number 9055A was used for both parts.

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Ahh

Thanks Richard,

I’d actually seen the toolbox bolts/knobs and wondered.

I must check the thread properly though because I have boxes full of bolts and I’m certain I tried at least a 5/26 cei

thanks very much for your advice, that’ll let me get it to 100%.

next I’ll either have to get my hands on a rolling chassis or sell up and start a new project

regards Raymond

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Knobs, Nuts and Screws...

Raymond, the engine looks wonderful, just as a display item on its own. Perhaps you should look for a featherbed and build the ultimate 'Poor Man's Manx' ? :-)

In the later WD Spare Parts lists, the fastener was referred to as a nut and a screw, but the same part number (9055A) for both ! No wonder it's not completely clear ! 9055 had been the number for the early round screw used with the alloy covers. At that time, the toolboxes had a lock.

The 'gravity screw' or single-sided wing screw was a good solution to both as it simpy couldn't come undone on its own. I believe that the originals had a reduced diameter lead, as per the early type to aid picking up on the thread.