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Tractor Talk Discussion Forum

hey tractor vet need to pick your brain

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glennster

11-14-2007 05:52:42




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been fightin my minnie moline big mo500 loader backhoe. 4cly gas 206 cu in. way too much under hood heat. fuel tank sits behind motor, front mounts to exhaust manifold on one side, engine block on other.builds up so much heat after a while it will boil fuel in gas tank. was digging the other nite, noticed exhaust mainfold was brite red, dang near could of brazed on it. opened the main jet to put more fuel to it, brought the color down alittle but still looked to hot to me. tractor runs good otherwise. im gonna try setting valve lash on exhaust a little looser, book calls for .010 hot, ,018 cold. timing calls for 27 degress at 1750 rpm. thinking on maybe giving it a little more advance. engine temp runs 190 when hot, coolant doesnt boil over. any other ideas to get temp down? exhaust manifold is new, no vaccuum leaks, carb rebuilt. she drinks plenty of fuel so i dont think it lean. i been running her now with the hood off to get rid of the excess heat.

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Tradititonal Farmer

11-14-2007 09:25:08




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 Re: hey tractor vet need to pick your brain in reply to glennster, 11-14-2007 05:52:42  
I'd say you're running too lean a mixture.You are probably getting just enough gas to run the tractor but not the full stream.



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the tractor vet

11-14-2007 07:40:05




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 Re: hey tractor vet need to pick your brain in reply to glennster, 11-14-2007 05:52:42  
As not being a minni mo expert here like others have said make sure the advance is working ,But watch your timing as there is a vary fine line on just how far one can go . And yea i will get some flack here on this one but up the grade of gas. Like i have said before this 87 octane gas burns fast and HOT and is nowhere near what was made back when the engine was made . I was having about the same problem with my Massey 300 combine till i switched from the 87 and went to the 93 dropped the engine temp down 20-30 degrees on the water temp. As for the boiling of the gas in the tank myself i would make up a baffle under the tank that would give at least one inch airspace along with it going up inft. of the tank to keep the air coming in from the rad by the fan. This will realy help on that. Just something made out of light sheet metal.

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glennster

11-14-2007 09:06:30




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 Re: hey tractor vet need to pick your brain in reply to the tractor vet, 11-14-2007 07:40:05  
never dawned on me to check the distrib advance, i'll check that this weekend, and throw 5 gallons of premium in there. this thing had me stumped with the heat thing. it drives 2 hydraulic pumps to run the backhoe, and even loping along at half throttle, she gets red hot. time for some more investigation. thanks everybody for the advice. some times you cant see the forest thru the trees!!



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Mike (WA)

11-14-2007 07:57:57




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 Re: hey tractor vet need to pick your brain in reply to the tractor vet, 11-14-2007 07:40:05  
If you want a heat shield that REALLY works, use a sheet of copper. We had a wood stove that was way too close to a wall, and put a sheet of copper an inch out from the wall. You couldn't hold your hand in front of the shield for the heat, yet the shield was cool to the touch- never did figure out where the heat went, it just worked.



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the tractor vet

11-14-2007 08:32:44




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 Re: hey tractor vet need to pick your brain in reply to Mike (WA), 11-14-2007 07:57:57  
And have yo priced copper lately a pice of sheetmetal will do just fine and nobody is going to steal his tractor just for the copper under the tank , now they may steal his gas .



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Jon Hagen

11-14-2007 06:39:10




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 Re: hey tractor vet need to pick your brain in reply to glennster, 11-14-2007 05:52:42  
Check if the distributor advance weights/shaft is stuck and not allowing spark advance. Has happened several times to my Big Mo 400 which likely has the same distributor.



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35A

11-14-2007 06:28:34




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 Re: hey tractor vet need to pick your brain in reply to glennster, 11-14-2007 05:52:42  
Try advancing the timing. Sounds like it's a shade retarded. I agree with the others, manifold should not be that hot unless you are pulling hard all the time. my 2 pennys



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RustyFarmall

11-14-2007 06:26:27




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 Re: hey tractor vet need to pick your brain in reply to glennster, 11-14-2007 05:52:42  
That manifold should not get that hot except under extreme loads, and maybe not even then. I've seen manifolds and mufflers glow, but only when the engine is putting out all she can. You might want to play around with the ignition timing? Might also want to try running it with a straight pipe in place of the muffler just to see if maybe the muffler is restricted? I think you're on the right track on the carburetor. A richer mix will run cooler than a lean mix.

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Roger in Iowa

11-14-2007 05:59:38




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 Re: hey tractor vet need to pick your brain in reply to glennster, 11-14-2007 05:52:42  
Hood off may actually cause it to run hotter as air is not directed over or along side of engine. Just a thought.

Farm tractors (gas) will run with manifold red but has to be pulling a pretty good constant and heavy load. Would not think a backhoe would be worked that hard...

Roger in Iowa



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Aaron Ford

11-14-2007 05:57:59




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 Re: hey tractor vet need to pick your brain in reply to glennster, 11-14-2007 05:52:42  
Doesn't some industrial equipment have fans that are turned backward for this purpose? I wonder if there isn't a reversed fan available for this application. Heck, even one that could be adapted.

HTH
Aaron



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