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Farmall & IHC Tractors Discussion Forum
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400 Whats the Fix???

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Short Bolt

07-09-2007 03:40:10




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Bought a 400 farmall off a 92 year farmer. He told me how good it was, so I gave him $1500.00 cash took it home. Went and put it on the hay tedder, ran it about a hour went to shut it off, and it ran backward< Started it back up real quick tried to shut it down again same thing. Ended up putting it in gear and riding the brakes hard. to kill it.
Check the idle ,to fast took idle adjustment screw out all the way out and it still idles fast. Took all throttle linkage off still idles fast. Back the timing off till it runs bad. Then it will shut off.
Whats the fix????? Thanks

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Janicholson

07-09-2007 05:49:18




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 Re: 400 Whats the Fix??? in reply to Short Bolt, 07-09-2007 03:40:10  
The Idle issues mentioned need only one thing added. If the tractor was just "kept running with light loads, or idling, it may be that getting it to idle down will not immediatly cure the problem. Running it under load for 20 hrs (not all at once) with modern oil, and fuel will probably be the next medicine. With ignition off, as City Boy indicates, it is preignition. Use fifth TA ahead to kill it as you shut off the key (after ideling for a minute to normalize temps. JimN

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the tractor vet

07-09-2007 06:08:30




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 Re: 400 Whats the Fix??? in reply to Janicholson, 07-09-2007 05:49:18  
Also he may want to check and see what plugs are in it , if it has them darn D21's they can act like a GLOW PLUG. The old brain is slugish today with only 2 hours sleep. Darn semi's with stright pipes and jake brakes comming down the hill past the house this morning as the new breed of truck drivers can not READ SIGNS that say in BIG BOLD PRINT NO ENGINE BRAKES.



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Bob M

07-09-2007 04:59:26




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 Re: 400 Whats the Fix??? in reply to Short Bolt, 07-09-2007 03:40:10  
If it idles too fast with the carb idle stop screw turned out all the way, the governor to carb linkage needs adjusting.

Remove the sloped cover at the top of the governor riser tube. Now adjust the bellcrank underneath (turn the bellcrank it down 1 - 2 turns on the pushrod) to slow the idle.

Once you have the idle slowed down do the final idle RPM adjustment with the idle stop screw on the carb.

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the tractor vet

07-09-2007 05:57:33




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 Re: 400 Whats the Fix??? in reply to Bob M, 07-09-2007 04:59:26  
Bob now that is not the way you adjust them thar things. First to do a propper adjustment to scync. the gov. to carb ya pull the throttel all the way wide open and with that cover off ya remove the headed pin and hold the cross shaft in the WIDE open posision the headed pin should slide in Freely thru the clevis and cross shaft and what i do is give the clevis one half turn more then install the pin and replace the cotter pin . My next stop on this would be inside the govener and take a long hard look at where the spring goes thru the two holes on the bell cranks , if that spring is floppen around in the two holes in the levers then this is where ya need to do some fixen . That govener spring should fit them hole just prefect as there is suppose to be bushing in the levers . As this is what shoves the govener back to and idel if there is not tomuch slop in the linkage from the throttel on down to the govener . Next i would be checking for air getting in around the intake . Checking out the carb and the dist. for sticking flyweights . Then getting the timing back to specs. I have rebuilt a bunch of goveners and redoing the littel bushings in the levers ya can not believe how much differance it makes. Did one for one of my old customers that had a S/MTA that he bought new and it would not idel down he was liven with it for years that way till i said something to him about it when i had the tractor in to replace axel bearings . Showed him what the problem was and told him what was needed and since he is a clock repair person and has this neat littel machine shop in his basement we pulled the levers off and off to his basement we bored the levers out a bit to clean them up made up Bronze bushings drilled and chamffered the edges of the holes installed a new spring did the adjustment to the linkage and he thought he had a new tractor.

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Bob M

07-09-2007 06:34:11




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 Re: 400 Whats the Fix??? in reply to the tractor vet, 07-09-2007 05:57:33  
Tractor Vet - Indeed!

The bellcrank adjustment I describe is a "quick 'n dirty" method that's often sufficient to bring a fast idling H or M back under control. Incidentally if the other governor parts are OK it will generally result in a properly adjusted linkage when completed.

However if governor internals (bushings, spring ends, etc.) are badly worn, the work you describe is required to get the governor to working right.

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the tractor vet

07-09-2007 08:08:39




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 Re: 400 Whats the Fix??? in reply to Bob M, 07-09-2007 06:34:11  
That can give surging and poor performance . As there is relay no cure but to fix it wright and i would lay a dollar to a donut that his problem is as i said the spring is real sloopy Now you will have to forgive me here but it is like this if ya don't have time to fix it wright then why bother tryen to patch it as you will be whining about another problem brought on later . Like a gutless tractor and looken everyplace but where the problem is . Once ya find someone that has a small lath a drill press and a hammer can knock this out in 30 min. including the coffee break . This whole job should not take more then three hours total.

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City-Boy McCoy

07-09-2007 05:13:58




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 Re: 400 Whats the Fix??? in reply to Bob M, 07-09-2007 04:59:26  
Bob M: I thought about the governor also, but with it running on when he hits the kill switch, I figured it was probably more of a lean condition causing pre-ignition or detonation. But, you are probably right. mike



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Bob M

07-09-2007 06:36:10




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 Re: 400 Whats the Fix??? in reply to City-Boy McCoy, 07-09-2007 05:13:58  
Mike - You are correct. A lean carb idle mix does not help the problem!



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City-Boy McCoy

07-09-2007 04:01:07




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 Re: 400 Whats the Fix??? in reply to Short Bolt, 07-09-2007 03:40:10  
Sounds like something is causing it to run excessively lean. Lean engines run hot; hot engines are prone to pre-ignition and will run on when you hit the kill switch. Look for a major air leak somewhere - probably the intake gasket, or even a crack in the intake manifold. Or perhaps you have a partially clogged carb. If the 92 year old farmer let the tractor sit for a while, you probably ought to go through the carb thoroughly - disassembly and a good soaking in a bucket of carb cleaner, then blow it out and check all passages, finally, reassembly with a quality carb kit. mike durhan

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