Hi all, I’m fettling a nice old CQ, and the positive shut off doesn’t, well, shut off! The wheel turns as you’d expect but when it’s fully closed, a small amount of fuel or air can still come through. Any advice? Cheers, Adrian
Adrian Take the control spindle off, and with very fine grit wet and dry polish the tip so there are no burrs or nicks. Clean the receiving surface of the control cock with 0000 steel wool, and flush it it so there’s no residue in there. That usually works. Tony
Looking closely at that photo, the conical tip on the spindle needs to be carefully resurfaced. I would use 800 then 2000 grit wet and dry to do that (by hand). Cheers Tony
Thanks @Tony Press I managed to get a nice finish on the spindle, and after a couple of hours messing with it all it actually held the pressure, until turning it off and on again. Perhaps there’s a build up of crap still in the control cock. I need some more carby cleaner so will give it a rest and come back to it. I’ve thrown it in some lacquer thinner for now - not sure if that will do anything though!
Get back if it still doesn’t hold fuel under pressure. The next step would be to use a small amount of cutting compound. Tony
A few members on CCF have had good success "tinning" (applying soft solder) the end of the spindle (conical section) to solve the above issue. This then forms a perfect mating section when closed against the recessed area in valve. Risk free trial.. you can always applt heat and brush off the solder if the fix does not woek for you. The fix seems to hold up well to repeated use.
@Buckaroo If polishing and sanding or even the tinning doesn't work you should check out oldcolemanparts.com Yep you would have several options to choose from. https://www.oldcolemanparts.com/select-your-model-here/lamps/model-c-/Lamp-Valve.html https://www.oldcolemanparts.com/sel...del-c-/Lamp-Valve-Molded-Wheel-Used-E980.html https://www.oldcolemanparts.com/sel.../model-p-chandelier/Valve-Stem-Lamp-E122.html Cheers, Norman
I use a very light grinding paste (don’t let it on to the threads): open-close/open-close etc, the valve about 100 times. It makes a nice fit… Cheers Tony
I’ll do that next @Tony Press Looks like I can see the problem - something might have taken a chunk out of it at some point:
Well here she is!! After using a mixture of valve grinding compound and Autosol, and a lot more than 100 turns @Tony Press (a full episode of Star Trek The Next Generation), I managed to get the valve to seal a lot better - but it’s still not perfect. This created a new leak from the base of the cock, so I sealed it with some manifold sealant. Leak no.3 then emerged from beneath the generator and I discovered the female threads are quite poor - I added yet more manifold paste. It’s now running leak free on Kerosene as a safety precaution. What a beauty!!
