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Re: John Deere m maybe running too hot!
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Posted by Gene Davis (GA) on October 28, 2006 at 20:23:33 from (70.41.83.26):
In Reply to: John Deere m maybe running too hot! posted by Cassie Cottingham on October 28, 2006 at 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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