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Farmall & IHC Tractors Discussion Forum
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M overheating

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tmq

09-03-2007 19:04:23




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My 48 M continues to get hot when plowing and I can't figure out what is wrong. I removed the radiator and had a shop flush it out. I flushed the block, reworked the water pump, installed a new belt and thermostat. Refilled with new anti-freeze. I can use it all day around my acreage doing small chores with no problems but when I take it to the local plowing bees it soon overheats. How full should the radiator be. I have mine about 2-3 inches from the top. Any suggestions will be appreciated.

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Rootsy

09-04-2007 09:24:59




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 Re: M overheating in reply to tmq, 09-03-2007 19:04:23  
what exactly are you denoting as overheating? is it to the right side of the green or into the red? pegged all the way to the right in the red? Have you put a different numbered gauge in it's place to verify that it is in fact overheating?
One other thing to check besides the cooling system is if you are getting adequate fuel. I can easily tell if I have a fuel blockage in the tank or if I am running low as my temperature begins to approach the far right of the "Green" zone due to a lean condition while under heavy load. You won't hear it labor, maybe only very subtly... but it will warm up on you... same holds true if you have the main jet adjusted a bit on the lean side...

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Janicholson

09-04-2007 06:37:27




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 Re: M overheating in reply to tmq, 09-03-2007 19:04:23  
I agree with Bob, and will add that if the system is not leaking combustion gasses, here are some specific things to check:
1) flow of coolant. Leave the cap loose and operate the tractor a bit. (Make sure it is not boiling) then open the cap while running and look with a good light into the tank to observe flow of coolant. If it is flowing in eddies and real obvious, there may be ignition timing issues.
2) if the flow is weak or the coolant not warmed up much, there can be several things wrong. New T-stats can be bad (test in a can on the stove with a candy thermometer). The hoses can have internal failure that looks perfect on the outside but is collapsed and restrictive on the inside. Waterpumps can have their impeller loose on the shaft, or with the wrong gap to the housing (way difficult to pinpoint). Head gaskets can be in wrong with misaligned coolant holes. Thermostat can be in backwards (not likely, but possible). And finally there could be a rag or other foreign material in the system.
If when it becomes heated to the point that you need to stop, do so then (whth the engine OFF, and in high gear brakes locked) feel the back side of the rad to determine if it is hot all over, or just in sections. Ms are overcooled, and yours has something wrong. Good luck JimN

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Bob Kerr

09-03-2007 20:31:56




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 Re: M overheating in reply to tmq, 09-03-2007 19:04:23  
Are you sure it is overheating and not blowing comression past the head gasket? get a head gasket test kit at the auto parts store and check the coolant for exhasut gasses. If it shows positive, try tightning the head down again and then see how it does before pulling head off and checking for cracks or a blown gasket. I have seen some engines act like they were over heating and they were just pressurised with exhaust gas. When the governor opens up under load the extra cyl pressure just might be enough to slip past a loose gasket into the coolant. Sometimes the gauge will say it is ok and the cap blows like Old Faithful when that happens.

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