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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

1954 NAA Ford Carb is leaking out bottom circle? What is it?

Author  [Modern View]
8nModesto

12-26-2011 19:47:50
75.210.225.66



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Have a rebuilt Carb for my NAA (1954). Installed it...all fitting tight...but cannot stop leaking out the bottom. Seems to come out of the circle at the bottom of the carb. See Photo of bottom of Carb. Also the drain bolt seems to leak no matter how tight I secure it. Even put thread tape on the bolt... What is the problem do you think? SEE PHOTOS

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DollarBill

12-28-2011 03:30:15
74.178.58.230



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 Re: 1954 NAA Ford Carb is leaking out bottom circle? What... in reply to 8nModesto, 12-26-2011 19:47:50  
What the Montana guys sez.......



A couple of possibilities for your leaky carb vent: Float level too high; the needle/seat aint sealing or gas is leaking past the threads of the seat.

Onto your leaky drain plug - Is it possible the gas is flowing from the bronze drain down onto the drain plug and dripping off the plug making you suspect the plug?

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ZANE

12-27-2011 14:08:33
98.83.19.170



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 Re: 1954 NAA Ford Carb is leaking out bottom circle? What... in reply to 8nModesto, 12-26-2011 19:47:50  
Always turn off the gas valve at the sediment bowl when not using the tractor.

That centered plug is there for a very good reason. If it werent there to drain the excess gasoline out in a couple of days or less the whole tank of gas could end up in the crankcase. It happens!
Close the gas valve when not in use.

Zane



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old

12-27-2011 10:02:23
209.86.226.18



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 Re: 1954 NAA Ford Carb is leaking out bottom circle? What... in reply to 8nModesto, 12-26-2011 19:47:50  
Just a little tip for you and others. When you take thee carb apart pull the main jet adjustment screw out before you take the bottom part off other wise you can end up bending the adjustment screw which then in turn means you have to buy a new one at a cost of around $25



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GB in MT.

12-27-2011 06:43:38
216.47.53.249



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 Re: 1954 NAA Ford Carb is leaking out bottom circle? What... in reply to DollarBill, 12-26-2011 19:47:50  
Quoting Removed, click Modern View to see

NO.....the drain plug (hexhead bolt) is to drain fuel only from the carb BOWL......The sintered bronze plug is the weap plug, for draining the overflow from the choke area chamber!!!

Two separate area's of the carb. ....two seperate functions!!!

GB :)



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8nModesto

12-27-2011 06:32:57
75.208.181.250



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 Re: 1954 NAA Ford Carb is leaking out bottom circle? What... in reply to 8nModesto, 12-26-2011 19:47:50  
Thanks guys..quick question: Is the SINTERED plug Jerry mentioned...the SAME as the DRAIN HOLE PLUG?

FYI I installed a brand new Sed.Assembly (Napa) and, Yes, I shut off the fuel every time.



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GB in MT.

12-27-2011 04:05:45
216.47.53.249



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 Re: 1954 NAA Ford Carb is leaking out bottom circle? What is in reply to boler76, 12-26-2011 19:47:50  


# 1......don't use "thred tape", anywhere to stop fuel leaks!!!! Gas will eat up the tape, in time, and can get into the carb bowl, and start plugging things up!!

Do like Jerry/MT, told ya and run new 1/8 NTP pipe threds in the drain hole......then install a new 1/8 Brass, pipe plug....(obtained from yer local hardware store)!

As for leaking from the bronze weap hole......Check the float setting for 1/4" from the center gasket, to the bottom of the floats!!!!!

BUT.......I suspect, that you have not yet learned to shut off the fuel at the sed. bowl, and the float needle and/or seat is leaking. If that is the case.....install NEW float needle and seat!!!! (the seat has to be really tight, to keep it from leaking, and the needle has to set in the seat correctly, to open and close smoothly!!!

Get into the habit of shutting the fuel off, when you shut the JUBE down for any length of time!!!
Saves gas,....and don't let yer JUBE CARB., leak on yer garage floor!! :lol:
GB :)

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JGayman

12-27-2011 08:09:32
67.234.218.251



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 Re: 1954 NAA Ford Carb is leaking out bottom circle? What is in reply to GB in MT., 12-27-2011 04:05:45  
"# 1......don't use "thred tape", anywhere to stop fuel leaks!!!! Gas will eat up the tape, in time, and can get into the carb bowl, and start plugging things up!!"

Are you sure about this? I've been using teflon thread tape on fuel lines for decades and never had a problem with gasoline dissolving the tape.



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Jerry/MT

12-26-2011 21:00:48
206.183.116.145



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 Re: 1954 NAA Ford Carb is leaking out bottom circle? What... in reply to 8nModesto, 12-26-2011 19:47:50  
My guess is your float is not correctly set and fuel bowl is overflowing and causing the sintered plug to drip fuel just like it"s supposed to. AS far as the plug is concerned, does it have the correct threads or are they stripped or worn , etc? I believe they are NPT threads.



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