8N Carburetor Leaking

[8N_John]

Gas has started leaking out of the bottom of the carburetor of an 8N I recently bought. There is a small hole (about 1/8 inch) centered at the bottom of the carburetor that it's leaking from (dripping at a good pace). Not sure if there is suppose to be a plug there or not?? Should this hole be plugged for good?

 

[jiggs]

I would not do that... the hole you describe is there just for that purpose. what is happening is the needle valve is dirty or has dirt under it and that hole lets the extra gas leak off as it should. Remove the carb. and clean and inspect for dirt or water and any thing other than gas. For the cost I would say replace the needle and seat. that is a real simple carb. and very easy to repair. good luck.

 

[markct]

sounds like your needle is stuck or your float has a hole in it, take it off and dissasemble it and rebuild it, a kit is about 25 bucks for them, and they are a very simple carb so dont be affraid as you should be on many auto carbs from the 70s and 80s

 

[Youare]

My 8N had a gas shut-off valve located just under the fuel tank on the sediment filter unit. It was recommended to shut-off the fuel supply after using it for the day or several hours to prevent leakage.

However, mine did not seem to leak if I left the fuel on. You probably have a piece of dirt on the neddle valve seat or the float has become saturated with fuel and is keeping the neddle valve open once the bowl is full.

TSC has rebuild kits as well as the Ford / New Holland dealerships. The kit cost me less than $20.00 a few years ago and took about and hour to install. The instructions are very good and it is a simple task.

Randy

 

[8N_John]

Can someone check to see if there is a standard hole centered at the bottom of the carburetor? Mine was about 1/8" in diameter. Talked to someone else who thought there was just and indention, but no hole. If that is the case, then maybe I should go ahead and have the hole plugged??

 

[teddydo]

If you plug the hole the gas is still going somewhere. My guess would be the oil pan......teddy

 

[8N_John]

Do you think the previous owner drilled the hole to prevent flooding??? The hole does look like something a 1/8" bit could have created.

 

[GaryK]

From your posts it seems that you are bound and determined to plug that hole. I would not do that until I got a manual or rebuild kit that shows the carb and what goes where. If you take it apart and rebuild, you will find out where the hole goes and if it should be there.

 

[8N_John]

I'm really not deadset to patch the hole. I simply want to find out if anyone else with an 8N has a round hole in the bottom of their carburetor. If it's not suppose to be there, then I'll patch it. One person I talked to mentioned they thought there was an indention at the bottom, but not a hole???

 

[GaryK]

I would go on the side of caution and drop the bowl and see where the leak is coming from and if it is indeed a rust hole or an overflow problem.

 

[Lloyd_E]

If it is a schrebler bowl carb. That 1/8 hole would have had a drain screw in it.
I would drill the hole, tap and fit a fine bolt. It is used to drain dirt from bottom of bowl. While you are at it - buy a rebuild kit as many others have suggested.

lloyd

PS: Lots of info on net for rebuiling old carbs.
/forums/images/graemlins/cool.gif

 

[Soundguy]

</font><font color="blue" class="small">( Can someone check to see if there is a standard hole centered at the bottom of the carburetor? Mine was about 1/8" in diameter. Talked to someone else who thought there was just and indention, but no hole. If that is the case, then maybe I should go ahead and have the hole plugged??
)</font>

Look... you've been told already not to plug the hole air horn hole.. /forums/images/graemlins/confused.gif.. but looks like you really.. really want to do it.. /forums/images/graemlins/shocked.gif /forums/images/graemlins/crazy.gif

The MS carbs ( assuming you have a ms carb.. and not the zeinith ) had an air horn drain, and a pipe plug on the bottom ,the plug was the drain for the bowl.. the air horn is for precisely what people have been telling you.. to drain off excess gas from a flodded carb. If you plug that hole, gas will simple come out of the mouth of the carb ( where the air comes in ). If it is the pipe plug that is missing, gas will flow straight out of the carb, as fast as it can thru the gas line... that doesn't sound like what you are describing... sounds like you are talking about a drip of gas from the air horn. I agree with the others.. probably a leaky float needle or misadjusted or bad float, causing excess gas to build up and then overflow/drain.

Tisco makes 2 kits for the tsx 33/241 carbs. A basic for about 20 bucks.. and a 'better' kit for about 30 bucks. main difference is the better kit has preplacement needles. The float must be bought seperately.. if you need one. Refurbed or new aftermarkets are going for about 139$ or so.

Some chemdip, and pipe cleaners and bits of thin wire are all thats needed to clean that carb. Also.. check to see that the elbow that goes into the carb still has a metal screen on it.. if not.. that is one place where crud is getting under the float needle.

Soundguy

 

[8N_John]

If I decide to buy a carb kit, it there a carb model # I need to find? Where do I find it? I have a 52 8N.

 

[Soundguy]

That 8n should have a M/S 241B carb on it.. however any of the earlier variants could have been swapped over to it.. including the TSX 33 from the 9n/2n. For all intents and purposes the tsx 33 and 241 are the same carb. ( so are the new ms look-alikes from TSC ). The manifold mount and gasket is the same.. throttle and choke hooks up the same.. fuel line hooks up the same.. visually looks identical... idles speed set screw, idle jet, and main jet adjust the same. The same master kit for the 241 will rebuild a 33.. same jets, needles, float.. etc. ( may have been minor manufacturing differences in the idle or economizer sections).. but all the replaceable parts are interchangeable. Tsc sells a 25 and 35$ kit..the main difference is the 35$ kit has a few extra parts and the idle and main needle replacements.. some ectra felt packing.. etc.

If you have a zeinth carb.. all bets are off.. but you can get kits for it online as well.

Soundguy

 

[Will Matthews]

Hey, if you are still looking for information on the gas leaking from the bottom of your 8N try the link below re: 8N carb overhaul. It is pretty detailed about the 8N carb and how it is supposed to operate.

You may hav to cut and paste the link.

www.ytmag.com/articles/restore/8ncarb/artint231

Will

 

[Mamaskittlez]

I also have a 52 8N that is overflowing fuel out the Air filter stack side of the carb. I have rebuilt the carb with new seat and needle valve. I don't think i replaced the float but been a few days of hectic family things going on so i can't remember. However: if I did replace the valve seat and float what else could it be.

I have found that the previous owner plugged up the power sand (air Horn) hole so now i have to drill and re-tap a hole and screw for it. and found that the float has gas in it so i need to go purchase a new float as well.

Does anyone know how to remove a brass screw w/o messing up the inside threads so that i can just replace the original screw. It'd be much easier lol