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Subject: Fuel Valve Knob

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Richard    Posted 12-06-2018 at 06:57:26 [URL] [DELETE]        [Reply] [Email]  
  • Fuel Valve Knob
  • When I bought my 1950 8N, the shutoff knob was missing. I replaced the valve stem and the new knob. After an hour running, the knob and screw has fallen off. Any clue as to where to buy a new knob and screw? I really appreciate this Club, as the articles have been very helpful. I also own a 1951 Huber Maintainer, which has a 6 cylinder Hercules QXB-5 engine.


    K.LaRue-VA    Posted 12-06-2018 at 11:07:57 [URL] [DELETE]        [Reply] [Email]  
  • Re: Fuel Valve Knob
  • Email is open, I probably have a spare knob and can scrounge a screw.
    I had the same problem with the exterior faucets on the house. The screws will loosen and if not tightened the knobs will fall off. The knob is usually right there, but the screw is always gone for good. I don't carry a tube of locktight around with me when making general repairs. My fix for this problem was to stick the screw thru the knob, take the pair of pliers I do carry, and slightly deform the threads near the back of the knob. The screw now threads in fine until it hits those slightly dinged threads. One or two more turns and it's tight and will now stay tight.

    Richard    Posted 12-06-2018 at 12:35:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Fuel Valve Knob
  • Thanks for your advice. I do have a spare knob, but will add some Loctite to the threads.

    Rustyal    Posted 12-06-2018 at 09:15:59 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Fuel Valve Knob
  • You have to use a drop of locktite when you install them.

    Tim Daley(MI)    Posted 12-06-2018 at 07:57:35 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Fuel Valve Knob
  • HiYa Richard-
    The Sediment Bulb Assembly Fuel Valve Knob falling off has been a problem for a few decades. Seems it never happened on originals. When I was losing them mowing grass with my 8N after the 2nd time or so I got wise and started applying a dab of Threadlocking Compound on the 8-32 screw when I installed it. The Fuel Valve Stem, p/n APN-9194, is the only wear/working part on the Sediment Bulb. There is a rubber 'seal' on the stem that will eventually get chewed up and worn out and thus cause leaks. It is a $6 part and is the only part that needs to re be replaced. You do not need to replace the entire Sediment Bulb Assembly if leaks develop unless the inlet or outlet port threads get stripped out. That is another problem because many do not realize they use a special thread size -7/16-24 used on brake and fuel lines. Attempts to retap with the wrong size tool or by crossthreading at installation mucks it up and will also cause leaks. Avoid Teflon tape for a 'fix'. Do the job right the first time. Do you want to be guessing if your fuel system will leak? Threadlocking Compound can be purchased at any auto parts supplier. It will permanently keep that screw from falling out. There is no need to ever remove it. When the fuel valve stem eventually fails from a bad/worn seal, remove it, purchase a new one, and repeat Threadlocking process and reinstall it.





    Tim Daley(MI)

    Ozlander    Posted 12-07-2018 at 12:32:19 [URL] [DELETE]        [Reply] [Email]  
  • Re: Fuel Valve Knob
  • I've never heard the name 'Sediment Bulb Assembly" before.
    Always heard 'Sediment Bowl'.
    Is this a regional slang thing?

    Tim Daley(MI)    Posted 12-07-2018 at 17:59:23 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Fuel Valve Knob
  • Look in the Master Parts Catalogs as that is what the part is described as. It has nothing to do with region.

    2N-9155-B; Valve and sediment bulb assembly (fuel).
    9N-9162, Bowl (sediment bulb)

    Parts suppliers nowadays just label it the 'sediment bowl'.

    Tim Daley(MI)

    John In MI    Posted 12-06-2018 at 06:58:46 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Fuel Valve Knob
  • I had a similar situation with a new sediment bulb/shut-off. I bought a new one at Tractor Supply. Several hours later I went to shut off the gas and the knob was gone. When I checked on another one at Tractor Supply I found that they were shipped with everything loose. Ove the years I saved old sediment bulbs and shut-offs and scavanged parts. Best that I can suggest.


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