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Farmall & IHC Tractors Discussion Forum
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Farmall 240 - Engine stumbles after 30 +/- minutes

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Walter60 Farmal

07-29-2014 16:41:05




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Help. I have replaced coil, points,condenser,rotor,cap,wires and plugs. I have rebuilt the carburetor. I have pulled the head, pistons and sleeves. New pistons,rings,sleeves and had the head done with new valves.It starts easy and runs perfect until.....Thermostat works. Gas is good. Air filter clean. Coil is wired direct from battery with switch to eliminate old wiring issues. I have had and used this tractor for years.Need advice. Thanks

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Janicholson

07-29-2014 18:47:31




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 Re: Farmall 240 - Engine stumbles after 30 +/- minutes in reply to Walter60 Farmall, 07-29-2014 16:41:05  
Feel the coil when it stumbles. If it is way hot, the issue might be that it is a 12v coil for use with a ballast resistor (which means it is really a 6v coil). If given 12v it can heat and break dowm, causing misfire.
If the coil is warm and not way hot, My guess is fuel related. Put a can under the carb, and drain fuel for at least 2 minutes. If the flow slows down you could be having a blockage at the tank to sediment bowl connection, r in the screen at the carb fitting. The fuel cap has one or two vent holes in the top. Make sure the vents are open. Jim

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Walter60 Farmall

07-31-2014 16:16:05




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 Re: Farmall 240 - Engine stumbles after 30 +/- minutes in reply to Janicholson, 07-29-2014 18:47:31  
The coil is never hot. Coil is marked 6 volt no external resistor. Good flow from bowl drain. I ran the tractor with the cap loose. Nothing changed.



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Janicholson

08-01-2014 08:51:57




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 Re: Farmall 240 - Engine stumbles after 30 +/- minutes in reply to Walter60 Farmall, 07-31-2014 16:16:05  
Drain gas out of the bowl for at least 2 minutes into a clean can. It is necessary to let the needle and seat have full flow. If it slows down, the Flow is restricted at some point. One other possible issue is a intake manifold that is cracked or loose on the head and when it gets warm, it pulls away and lets in air. this can be checked with a unlit propane torch used to add fuel to the manifold area and listen for engine smoothing. (must be done when it is stumbling). Jim

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