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Farmall & IHC Tractors Discussion Forum
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A Back Fires When Shut Off

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nyvines

11-22-2007 15:22:05




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Restored and A over the summer, runs beautiful, paint went well, plenty of power, all mechanicals are operating perfectly except when I cut the spark off it backfires sharply.

Hunted this morning, now I am full of turkey.

Happy Turkey day




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Idaho Ron

11-23-2007 13:52:07




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 Re: A Back Fires When Shut Off in reply to nyvines, 11-22-2007 15:22:05  
When I shut off my tractors I turn off the gas at the tank and let them run for a minute, then turn off the switch. No bang out of mine. Ron



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mkirsch

11-23-2007 06:17:37




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 Re: A Back Fires When Shut Off in reply to glennster, 11-22-2007 15:22:05  
Just out of curiousity, are you working the tractor hard?

Backfiring is normal if you're working the tractor hard, because the combustion chambers are hot enough to cause the gas to ignite on their own.

If you're just playing around, it may be that you have your air/fuel mixture too lean, and the engine is getting hot from that. It may behoove you to open up the load screw on the carburetor some to let more fuel in.

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NY VINES

11-23-2007 09:35:51




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 Re: A Back Fires When Shut Off in reply to mkirsch, 11-23-2007 06:17:37  
This tractor does seem to me to get hot. I have never had a Farmall before, so I have nothing to compare it to. This one has a Zenith carb on it, how can I supply it more fuel?

Thanks for the help.



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RN

11-22-2007 23:04:04




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 Re: A Back Fires When Shut Off in reply to nyvines, 11-22-2007 15:22:05  
Old IHC procedure to stop magneto engines- throttle to idle, turn off gas valve at fuel tank and let engine stop when carb is dry, turnoff electrical switches if equiped after engine stops.. This gives a couple minutes idle/cool down time and no fuel to 'diesel' after ignition shutoff. RN



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NY VINES

11-23-2007 09:37:12




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 Re: A Back Fires When Shut Off in reply to RN, 11-22-2007 23:04:04  
That is very interesting... I will try that. Thanks for the reply



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Janicholson

11-22-2007 15:32:42




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 Re: A Back Fires When Shut Off in reply to nyvines, 11-22-2007 15:22:05  
Four answers:
They do that
Let it idle for a minute, and never shut it off with it above idle.
Set the idle as low as it will run well.
With it in High gear and brakes on, let out the clutch as you shut it off. This stops the engine and prevents pulling fuel into the hot combustion chambers. Seasons Greetings. JimN



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nyvines

11-22-2007 15:37:36




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 Re: A Back Fires When Shut Off in reply to Janicholson, 11-22-2007 15:32:42  
Is this a couse for concern?



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Janicholson

11-22-2007 16:10:33




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 Re: A Back Fires When Shut Off in reply to nyvines, 11-22-2007 15:37:36  
No!!!
As a warmed up to temp gasoline engine runs, the fuel and air is consumed in the cylinders. The ignition system starts the combustion and the flame front travels from there across the combustion chamber in a wave. (similar to the way gasoline will burn down a trail of gas poured on the ground(don't do this )).
When the spark is shut off the fuel (in these old un-controlled carburetor mixed engines) the mixture is still going into the cylinder. At times, hot glowing elements in the cylinder will ignite the mix, causing the engine to run a bit when shut off. Or the fuel gets pumped by the cylinder/piston into the exhaust system, where it encounters a bit of glowing metal or carbon. This time it explodes with a bang. It is pretty much expected of these tractors. IH introduced a fuel solenoid in the main jet of later tractors that shut off fuel at the same moment the ignition was shut off. Fuel injected car engines also shut off fuel at the same moment the spark is stopped. No Bang there either. JimN

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nyvines

11-22-2007 16:14:10




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 Re: A Back Fires When Shut Off in reply to Janicholson, 11-22-2007 16:10:33  
Thanks for the speedy reply and the good help



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Janicholson

11-22-2007 16:42:28




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 Re: A Back Fires When Shut Off in reply to nyvines, 11-22-2007 16:14:10  
You are very welcome. A long answer at times is education, a short don't worry is a perpetuation of ignorance. JimN



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