Solution to overflowing float valves.. The unseatable ones


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Prince
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Solution to overflowing float valves.. The unseatable ones

Postby Prince » Sun Jun 30, 2013 6:48 pm



This is but one solution to float valves that inexplicably fail to seat..i stumbled upon this on the verge of madness.. Brand new Oem float valves.. It became a game of wack-a-mole as to which valve would leak..; ( when bench testing).. Even set the float heights riduculously high .. Just to see what was going on.. Swapped valves between carbs to isolate the problematic ones.. To no avail...looked at the brand new float valve and decided to REMOVE the little sprung wire centering device.. Voila.. It was binding on the side of the float tang( worse, it was doing it intermittently ) .. Problem solved..as to the usefulness of this little valve addition ( spring centering device) ., i'm sure will be debated endlessly as to its pros and cons.. Just, one mans solution ..my, guess is that due to the tiny mass of the needle part of the valve ass'y ( tis, a tiny needle indeed) that it is too easily influenced by this helpful addition..



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dingdong
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Re: Solution to overflowing float valves.. The unseatable on

Postby dingdong » Mon Jul 01, 2013 8:43 am

Now that is interesting. Who'd a thunk it! Might also be why some aftermarket valves are so prone to this problem of not sealing.
Tom

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Fred Camper
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Re: Solution to overflowing float valves.. The unseatable on

Postby Fred Camper » Mon Jul 01, 2013 9:50 pm

Great to know, might suggest one tilt and shock the rack while bench testing to see it you can get one hung up. That is if you decide to leave them in.

Prince
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Re: Solution to overflowing float valves.. The unseatable on

Postby Prince » Mon Jul 01, 2013 10:19 pm

Been there done that( ye olde tapping of carb. Bodies).. No bravado intended..Not my first rodeo..it was a bit of a head scratcher .. I imagine the little guides work perfectly well with brand new unblemished floats.. . the play in the guide which allows free up and down movement also allows tha same guide to rotate and jam on the lock to lock diagonal ..not helping matters is the tiny needle ..methinks a design achilles heel..still could have a larger needle with the same flow rate..less prone to infinitesimal whims..thanks to everyones input.. A great forum..

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Re: Solution to overflowing float valves.. The unseatable on

Postby WingAdmin » Tue Jul 16, 2013 7:21 pm

Perhaps a little electric whacker could be invented that can be mounted to float bowls, and continuously whacks the side of the bowl when the engine is running, to prevent stuck floats. :)

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dingdong
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Re: Solution to overflowing float valves.. The unseatable on

Postby dingdong » Wed Jul 17, 2013 7:25 am

Then we would have a new thread here to answer the "new to me" guy who asks "what is that tapping noise"?
Tom

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Re: Solution to overflowing float valves.. The unseatable on

Postby virgilmobile » Wed Jul 17, 2013 11:39 am

I also had troubles as described but I attacked it a bit differently.
I removed the brass seat and using a Q Tip with brass cleaner I polished the entire inside.Actually using a small hand drill.They looked like new.
I also polished the needle ridges and removed the burrs with 3000 grit paper.
The last part was the float pivot area.The pin,stainless steel,was cleaned with sand paper and the float was fitted with the pin to ensure absolutely no binding.
The rubber tip of the valve was simply cleaned with acetone.

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Re: Solution to overflowing float valves.. The unseatable on

Postby dogdoggybob » Mon Jul 29, 2013 11:39 pm

I had a sticky needle valve or something blocking it open - leaking fuel out bottom of #3. I knew I'd be removing the carbs. Was not sure what to do. Did a search; saw this post and buffed the point with 2k grit. took off the spring/wire that sits on the tang - presumably the self-centering device and took out the seat blew it clean. I didn't buff the inside of the seat tho.

put it back together and in - no leak. not sure which one of those did the trick but I am happy it's working.

just wondering if taking off that wire will let the needle valve come out. Since it worked - I am assuming not - hopefully not ever.

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virgilmobile
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Re: Solution to overflowing float valves.. The unseatable on

Postby virgilmobile » Tue Jul 30, 2013 6:48 am

The spring clip is there to ensure that the needle will open when the float is low in the bowl.It literally drags the needle from the seat.
The spring loaded pin allows a bouncing affect in the float without changing the fuel level.
Cleaning the seat,needle tip,needle valve ridges and pivot pin are usually all that's necessary.

Prince
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Re: Solution to overflowing float valves.. The unseatable on

Postby Prince » Tue Jul 30, 2013 8:27 am

Oddly the spring thingy , pertaining to the float valves up and down movement makes no contact with said spring thingy lol..it neither pushes nor pulls..float "stop" limits the travel of the floats well before the float tang can " pull" the float valve.. These were brand new Oem valves and seats that tested perfectly with a vacuum test..its worthy of note many carb set ups have no " spring thingy " stock from the factory..( with no ill effects)

dogdoggybob
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Re: Solution to overflowing float valves.. The unseatable on

Postby dogdoggybob » Thu Aug 01, 2013 10:37 pm

thanks!

good to know why / how things are supposed to work.

I hope it holds - going on a 4 day trip soon.




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