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Tractor Talk Discussion Forum

John Deere m maybe running too hot!

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Cassie Cottingh

10-28-2006 15:24:58




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Can anyone out there give me some advice on this problem? Have John Deere M tractor just overhauled. Put new temp guage too and says engine is running 220 degrees. I shut it off at 220 degrees. Put thermomter in radiator to see if maybe new guage was wrong. I said 220 also. Changed radiator out and it is in good shape. Mixed water and antifreeze up really well before putting in tractor. 50-50. Cap is brand new and fits snuggly. Its a 47 or 48 model. The top radiator hose gets really hot while the bottom hose just gets luke warm. Is this normal? Its almost like water is circulating or perculating. Could I get some advice on what to try next.I do have fan belts tight also. Thanks for any help!!

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buickanddeere

10-28-2006 21:45:15




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 10-28-2006 15:24:58  
There is no water pump, she just thermal syphons. The coolant leaving the engine will be near or actually boiling as a normal state of affairs. The early M's also placed the temp probe where it reads hotter than what the engine was actually running. If she doesn't boil over, there are no problems. It will also burn less fuel and foul the plugs less when she's warmed up.



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Gene Davis (GA)

10-28-2006 20:23:33




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 10-28-2006 15:24:58  
Worked for Deere dealership during the "M" and its related family years. The Tractors do have a natural tendency to run hot. It sounds like you may need to clean the coolant passage in the engine and check for stopped up ones. Check to see if your timing is right, late timing makes this engine lazy and runs hot also. The Korean war and it's shortage of copper and brass caused some of the tractors to have steel radiators. The best way to fight it is to keep a good 50/50 coolant mix in it. Be sure to mix it thoroughly before installing it in the radiator. The antifreeze will not mix in the radiator very well because there is no circulation from a water pump and will definitely cause overheating. Thermo-siphon systems like this have to have a cleaning solution treatment occasionally to ensure the heat transfer from the engine to the coolant. Some times we had to add a can of the stuff known as "Engine-Kool" that aided in heat transfer used to get it from NAPA. It was actually designed for use in early cars with air conditioning that had trouble trannsferring the heat load. Check to be sure that some one hasn't installed a radiator from a water pump tractor as it may not be copper finned which is really needed to handle high heat loads. Keep the fins clean and straight so air can flow freely. A good radiator shop rodding it out and cleaning the radiator and painting it with their coating helps transfer the heat. The 40 came with a water pump and a higher pressure system and it did better.

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Mak

10-28-2006 16:57:17




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 10-28-2006 15:24:58  
Can you have the head gasket on wrong? Plugging off a water port.



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`Bernie in MA

10-28-2006 16:29:08




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 10-28-2006 15:24:58  
I had an MC that ran hot all the time. I bought a 6' flail chopper, knowing I was going to get a bigger tractor in a year. I had to rig a water barrel on the headboard of the truck and keep water running into the tractor radiator continously in order to use the M. I bought a new 420C the next Spring, 1959. Still have it.



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HAPPY DEERE

10-28-2006 16:09:23




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 10-28-2006 15:24:58  
the thing you need to do is drain what you have in it then just put some water in it then put some water in it till its almost full then add a tube of food coloring let teh tractor run for a while and see if the food color is all throughout the system sounds to me like you got a plug in the head since the motor is rebuilt i would maybe take it to a locAl dealership we have a tool called a flowmeterwhich looks like a radiator hose but has a gauge on it that tells if there is any problems in a system also check and see if you have the proper amount of water by draining it and taking out the end of your lead on your water gauge the slowly feel up the radiator see if it goes over the radiator down the top pipe before water starts coming out the whole.

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