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Farmall & IHC Tractors Discussion Forum
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F-12 problem

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MT

10-04-2006 13:02:29




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Ok --first thanks for previous advice.My next question I got the F-12 running and it is black smoke so carb problem.It runs good then pulsates with black smoke coming out exhaust.I also notice when I took gas line off gas only came out on about the third or forth spin of crank.It seems like it is pumping air into the sediment bowl also. Also what does the gas vent thing on top of hood do?I ordered a new carb kit so hoping that is my problem but I do not know.Any advice would be very much appreciated.Mike

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David Allgire

10-04-2006 20:06:19




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 Re: F-12 problem in reply to MT, 10-04-2006 13:02:29  
The cast iron "thing" on top of the hood is to handle the overflow of the fuel pump. The fuel pump is operated off of a rod that rides on a cam lobe. Every time the cam lobe pushes on the rod, fuel is pushed up through the line that runs to the overflow chamber by the use of two check valves in the top of the fuel pump. The overflow chamber has two lines out the bottom. One has a tee in it. One side of the tee comes from the fuel pump, the other goes to the carburetor. The other line is almost twice the size and is plumbed back to the intake line from the fuel tank to the fuel pump. What fuel is not required by the carb is sent back to the intake by the larger return line. The plug on top of the overflow chamber is vented by a small hole drilled into the side of the plug. Yes, you can prime the carb line through the vent plug on top. Just trying to clarify how this particular system works.

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Don Hopf

10-04-2006 18:01:25




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 Re: F-12 problem in reply to MT, 10-04-2006 13:02:29  
The cast iron vent thru the hood is used to prime the carburator. If I remember right, there is 3 tubes coming out of this casting. One runs to the carburator inlet. The 2nd one is for output of the fuel pump. The third one is the overflow back to the fuel tank or fuel inlet of the fuel pump.

You can prime the carburator by removing the cap off the top of the casting and carefully pouring gasoline into the casting.

Don

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Fawteen

10-04-2006 13:23:24




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 Re: F-12 problem in reply to MT, 10-04-2006 13:02:29  
I'm not sure on the fitting sticking though the hood by the gas tank (my 1938 F14 doesn't have it) but it's either a pressure regulator or an antisiphon device, I think.

On the "gas only comes out on the 3rd for 4th crank" , that's normal. You do NOT want to run the carb dry if you can avoid it, because refilling the float bowl at hand-cranking speed takes a LONG time...

First thing I'd check is the float level. If the float is set too high, raw gas will run into the manifold. Also highly likely, if the float is waterlogged (pinholed, and full of gas) it'll set on the bottom of the bowl and never shut the needle valve off, and you'll get the same result.

Go ahead, ask me how I know this..."8^(

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Fawteen - Also

10-04-2006 13:25:41




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 Re: F-12 problem in reply to Fawteen, 10-04-2006 13:23:24  
Some turbulence in the sediment bowl is normal.



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MT

10-04-2006 15:41:44




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 Re: F-12 problem in reply to Fawteen - Also, 10-04-2006 13:25:41  
THANKS MUCH



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Fawteen

10-04-2006 15:48:21




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 Re: F-12 problem in reply to MT, 10-04-2006 15:41:44  
No charge. Free advice, and worth every penny ";^)



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