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Farmall & IHC Tractors Discussion Forum
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Dieseling SMTA

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Tom

12-11-2003 07:08:41




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Our gas SMTA Diesels after shutoff. The fuel and timing was set using a dyno this summer after the engine rebuild. Any suggestions? Tom




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Mark -- Mich

12-11-2003 18:48:34




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
Tom, My gasoline Super-M will diesel if it has been run hard and you don't let it idle for about 2 minutes. It has fire-crater pistons and I use unleaded regular gasoline. My Farmall H (with gasoline) has never dieseled no matter how hard it has run and how quick you shut off the ignition. It is a distilate engine with the low compression ratio. I like the idea of letting them idle for a while before turning off the ignition as suggested in the other replys. Of course, the fuel shut-off option always works.
Mark

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Hugh MacKay

12-11-2003 18:47:14




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
Come on guys, these tractors have been doing this since the day they were new. They were quite clearly designed to idle and cool down, then shut off. I've seen the new modern way, before the tractor looses it's revs the switch is turned off. IH should have designed a seat that would kick operators like this in the backside. May be a good idea would be for some of you to put your ignition switches on the grill. Remote starter and shuttoff, that would be the answer for you guys that don't have time to wait for tractor to cool down.

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RN

12-11-2003 18:15:12




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
TOM: Try turning off fuel tank valve, let it idle until carb runs out of fuel and engine stops, shut off igntion switch. This used to be a normal procedure on early magneto tractors like F-20. Since engine was rebuilt recently, shouldn't have carbon hotspots, have heard of sparkplugs and (rarely) fragments of head gasket or other scrap in cylinder causing hotspot. RN

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Ben in KY

12-11-2003 12:29:54




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
My 444 with C153 engine has a fuel shut-off solenoid on the carb. I guess since IH put the shutoff solenoid on there that yours is not an isolated incident. Premium gas and most all of the other tips listed here will help or cure the problem.



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Chris Brown

12-11-2003 10:38:25




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
I got one better than that.I have a really well worn out H that if you don't slip it in gear and kill the engine it blows off the muffler,BAM!! it blew out the side of the old muffler,It's been that way for 15 years ,it only does it when it is hot and you turn off the switch. It does have a nice low idle. I have always suspected something with the alternator feeding back through the ignition,but it has never bothered me enough to really look into it.

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BEL@IN

12-11-2003 09:53:56




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
Don`t ask me why but I had a Super M that diesled very bad. It was a new tractor to me so I don`t know old the gas was. Drained it , put in high test gas, high test probable wasn`t necessary, and that ended the problem. Beware of old fuel.



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Mark

12-11-2003 08:00:29




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
The only thing that causes "diseling" is hot spots in the cylinder igniting the fuel/air mix, carbon deposits mainly. The ignition system has nothing to do with it as it is shut down when the problems happen. How old are your plugs? lots of deposits on them? They are the hottest spot in the cylinder when the tractors running and therefore the most suspect to the dieseling problem. Happens alot when the tractor is used lightly for long periods then worked for a bit heating up the deposits, but not worked long enough to burn them off. Mixture may also be a little rich adding to the deposit preblem. A dyno is the place for carb adjustments and final timing setting.

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Allan

12-11-2003 07:39:13




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
Tom,

It is idling too fast; slow 'er down.

Contary to what people think, timing has absolutely nothing to do with run-on.

Allan



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Allan

12-11-2003 07:34:11




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
Tom,

It is idling too fast; slow 'er down.

Contary to what people think, timing has absolutely nothing to do with run-on.

Allan



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Bob M

12-11-2003 07:31:15




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 Re: Dieseling SMTA in reply to Tom, 12-11-2003 07:08:41  
Make sure the carb idle mix is set properly. Set the idle RPM as low as possible - if the idle mix is right it should idle down to 375 RPM or so without difficulty. Before shutting down, idle the motor for several minutes before hitting the switch. Switching to a cooler spark plug will sometimes help. Switching to 91 or 93 octane gas helps too- but it adds unnecessarily to your fuel bill.

Or do what I do: Idle the motor, put the tranny in 5th gear and slowly release the clutch as you hit the ignition switch. The engine WILL STOP immediately!

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Bill Wineman

12-11-2003 08:09:16




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 Re: Re: Dieseling SMTA in reply to Bob M, 12-11-2003 07:31:15  
Our SMTA does the same thing especially if it has been worked hard. I think there are some hot spots in the combustion chamber and the high compression pistons probably add to the problem.

As others have said keep the idle slow, cool the engine down and I always slip the tractor in gear let out the clutch and push in the switch at the same time.



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