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Modern Tractor Discussion Board Topic: Re: John Deer 950 Over heating [Show Entire Topic] [Return to Forum] Author [expand] [Modern View] Jerry/MT 03-01-2009 16:23:11 206.183.116.129 20224 Report to Moderator You say that the tractor is overheating and then you say that the radiator overflows just a few minutes after start up when you think the thermostat opens.It sounds like you may have two separate problems. Most of these tractors should not be filled with coolant to the radiator cap. They should be filled just above the top of the core to maybe a half inch over the core. The rest of the space is for the thermal expasion of the coolant. That maybe what you are seeing on start up. Overheating can have a lot of different causes. Make sure that you have the correct presure cap on the radiator, that your water pump drive belt is tight and that you have the correct thermostat and that it is working correctly. Make sure the lower hose does not collapse at high rpms. Finally, make sure the air filter is clean. Diesels are different than gas engines in that they run at varialble gas temperature (varable fuel to air ratios) and when you reduce the airflow with a dirty filter, it causes the gas temperatures to rise in the cylinders. That puts a higher heat load on the cooling system. You also want to make sure that there are no bubbles in the coolant with the engine running. That can cause the radiator to belch coolant out of the overflow and it"s usually caused by a head gasket leak. [Reply]  [No Email] Mark Kalisz 03-01-2009 18:02:22 68.32.83.163 20225 Report to Moderator Re: John Deer 950 Over heating in reply to Jerry/MT, 03-01-2009 16:23:11   Thanks Jerry, I will check the air cleaner filter first. I can tell you that there are no bubbles while the engine is running and the level never changed durning start up. It began to rise only after the engine had been idling for about 5 minutes. I shut it off just before it started to enter into the overflow tube. It continued to rise briefly after shut down but only about a half inch.   [Reply]  [No Email] Jerry/MT 03-02-2009 11:56:12 206.183.116.129 20226 Report to Moderator Re: John Deer 950 Over heating in reply to Mark Kalisz, 03-01-2009 18:02:22   How far was the coolant below the cap BEFORE you started the tractor? Better yet, how high above the radiator core is the cap and how high above the core was the coolant? If you overfill the radiator, as the fluid starts to heat up, it will expand and the excess will run out the over flow. That"s called thermal expansion and has nothing to do with overheating and everything to do with overfilling.   [Reply]  [No Email] [Show Entire Topic]   [Options]  [Printer Friendly]  [Return to Forum]   [Add a Reply] Hop to: Another Forum Tractor Talk Tool Talk Restoration Tips Paint & Bodywork Implement Alley Tractor Transporting Allis Chalmers Case Combines Crawlers Farmall & IH Ford Ford 9N,2N & 8N Fordson John Deere MH & MF Harry Ferguson Minneapolis Moline Oliver & Cockshutt Garden Tractors Orphans Stationary Engines Today's Tractors Memorabilia Tractor Tales Using Your Tractor Tractor Pulling Site Comments Test Forum Buyer Seller Feedback Kountry Life Classic Trucks