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Why won't it stall good?

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Bryce Andreasen

03-25-2003 19:34:03

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I have the '55 farmall 400 gas, and it starts magnificantly, even with it's original engine, but when you shut it off, it almost is stalled, but than it's almost like it tries to refire twice, than either backfires or sounds like a woosh of air with shaking and a lot of smoke from under the hood? How can i solve it?

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49 Cubber!

03-26-2003 17:55:15

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Re: why won't it stall good? in reply to Bryce Andreasen (Magnum), 03-25-2003 19:34:03

Just simply turn the gas off and let it run til it cuts off.This will do a couple of things,get any crud that may be in the carb out and will eventually burn off that carbon.Might want to use a carb cleaner in the tank for a tankful or two.try a cooler plug as well.It worked for me.

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RAW inIA

03-26-2003 10:40:55

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Re: why won't it stall good? in reply to Bryce Andreasen (Magnum), 03-25-2003 19:34:03

Ths in a nature of the older Farmalls. As has been said, it is a result of ht spots or hot valves after running hard. The later ones had an electric solenoid built into the mixture control to shut the gas off cnmpletely when ignition was shut off to prevent this. The best for the engine is to let it idle a fewminutes before shutting down to let everything cool.

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Frozen Iron

03-26-2003 09:56:11

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Re: why won't it stall good? in reply to Bryce Andreasen (Magnum), 03-25-2003 19:34:03

Trying choking it off then turn the ignition off.

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Dr.Evil

03-26-2003 14:03:55

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Re: Re: why won't it stall good? in reply to Frozen Iron, 03-26-2003 09:56:11

Like Most here have said, It's because He's trying to shut the tractor off before letting it cool like the Operator's Manual says. Choking the engine to flood it would just wash what little oil is left on the hot cylinder wall off and might start scoring the piston & wall on a restart. As Dad instructed Me when I was about 7 yrs old.... Idle the tractor across the yard into the shed.... let idle slowly for a minute or two... slow the idle to it's slowest postition and push the ignition button in and they stop very nicely in a few revolutions. Idleing longer is better.

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Bob M

03-26-2003 05:43:29

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Re: why won't it stall good? in reply to Bryce Andreasen (Magnum), 03-25-2003 19:34:03

Bryce - This is fairly common to the older Farmalls. Cause is a "hot spot" in the combustion chamber (piece of carbon, hot spark plug tip, etc) causing the fuel air mixture to ignite after the ignition is turned off. The poor antiknock quality of the lousy regular gas being sold today doesn't help either.

Contrary to other's claims running on after the ignition switch is turned off is NOT affected by ignition timing. One you hit the switch there is no spark, hence no spark timing. So monkeying with the timing will solve the problem.

Things that will help: Idle the motor a minute or two before pushing the switch. Set the idle speed as low as possible, and make sure the throttle lever is fully closed before hitting the switch. Sometimes changing to cooler plugs will help. And the most reliable: Put the transmission in road gear and let the clutch out lightly as you hit the switch - the motor will stop EVERY time!

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Hugh MacKay

03-26-2003 08:45:02

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Re: Re: why won't it stall good? in reply to Bob M, 03-26-2003 05:43:29

Bob; I agree with you to a point, yes once you cut the power there is no more electronic ignition. However if you run your tractors as I do, just a hair more than recomended advance. They will run hotter and thus the dieselling. All the more reason to let them idle and cool down a bit. My dad used to say a gas Farmall was working great when stack turned a red glow at night while working hard.

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karl f

03-27-2003 21:28:58

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Re: Re: Re: why won't it stall good? in reply to Hugh MacKay, 03-26-2003 08:45:02

and what a sight/sound it is

who needs therapy when you have a farmall?
-karl

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Bob K - correction to Bob M's reply

03-26-2003 07:13:25

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Re: Re: why won't it stall good? in reply to Bob M, 03-26-2003 05:43:29

"...monkeying with the timing will" NOT "solve the problem."

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Bob M - thanks!

03-26-2003 08:00:39

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Re: Re: Re: why won't it stall good? in reply to Bob K - correction to Bob M's reply, 03-26-2003 07:13:25

Indeed.....that's what I meant! (As you can see keyboarding is not one of my best skills...)

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Ben in KY

03-26-2003 08:00:32

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Re: Re: Re: why won't it stall good? in reply to Bob K - correction to Bob M's reply, 03-26-2003 07:13:25

Couldn't the timing being off a bit cause the engine to be running a bit hot and cause the dieseling/backfire ?

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John In Iowa

03-26-2003 04:24:44

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Re: why won't it stall good? in reply to Bryce Andreasen (Magnum), 03-25-2003 19:34:03

One thing is your timing may be off. Also there is a lot of iron in the head and you should let them idle a bit and cool off before shutdown. One other thing, to save you TA, Always pull the lever back(Put the TA in the low side.) before shutting off the engine. This is one of the hardest things on the TA. With the TA in the High Side (Lever forward.) it will lock up when the engine turns backwards and sends a hard shock to the whole TA. The overriding Clutch is the one that gets hit the hardest, causing flat spots on the ramps and rollers.

John

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Hugh MacKay

03-26-2003 08:52:04

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Re: Re: why won't it stall good? in reply to John In Iowa, 03-26-2003 04:24:44

I always used to leave my TA Farmalls in high so they wouldn't free wheel and roll somewhere. I put 60,000 hours on 5 TA equiped Farmalls, and only ever rebuilt one. I might add it was the only gas model of lot. (300)

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CBL

03-26-2003 07:59:14

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Re: Re: why won't it stall good? in reply to John In Iowa, 03-26-2003 04:24:44

I have never heard that you can damage the TA buy not putting it on the low side before. I have used the old IH tractors on my farm for 36 years and this is the first time I have heard this. I have replaced a TA or two in that time also. I thought they just wore out? CBL

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Hugh MacKay

03-26-2003 02:18:57

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Re: why won't it stall good? in reply to Bryce Andreasen (Magnum), 03-25-2003 19:34:03

Bryce: Your timing advance is off just a wee bit. The other item that is a must with these old Farmalls is let them idle a minute or so to cool a bit. I would try that first, when you have been working tractor, just pull up let it idle for a bit, before turning off ignition. While the timing advance may cure the problem, it does give a bit of an edge on power, right where it is set. My Farmall Super A does this, and the longer and harder it has been running the worse it is. I am very reluctant to change timing advance, as the tractor is truly super on performance. I always set timing by ear and never use light.

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Fudd@work

03-25-2003 20:43:39

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Re: why won't it stall good? in reply to Bryce Andreasen (Magnum), 03-25-2003 19:34:03

Put it in gear, push on the brakes and when you shut it off, gently let out on the clutch to stop it. You will get the timing of this right after you do it awhile.

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