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John Deere Tractors Discussion Forum
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John Deere m maybe running too hot!

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Cassie Cottingh

09-23-2006 04:12:56




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Ijust got my John Deere M back from being overhauld. Runs great! However tractor seems to be running a little too hot. Installed new temp. guage and it the needle goes almost all the way to right, which is too hot I think. Engine doesnt steam but then I dont let it run long enough to. The old tractor was stored in barn for may years before restoring engine. Radiator was full of dirt dobbers which I cleaned out. A friend told me I needed to take radiator to radiator shop and have rodded out???? Would apprecitate some advivce on what maybe problem. I also put new radiator cap which fits snug. It isnt spring loaded however. THe tractor year model is 47. Thanks!

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Greg Miskow

09-26-2006 16:48:56




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 09-23-2006 04:12:56  
My M runs about 200 , I have no problems with this as the sender is in the hotest part of the engine. The rad cap / hoses never get too hot to touch . One other thing that might cause high temp , check for rust build up between the exhast manifold and water outlet , could transfer heat from manifold to outlet ?



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Lon in NE

09-24-2006 13:42:55




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 09-23-2006 04:12:56  
And, of course, there is one more thing that nobody mentioned so far. It depends if your M is an early model or late. The temperature sensor was located way up high under the hood, almost under the exhaust manifold on the early M's. This caused the guage to show that the engine was running hot, even when it was not really. Later models have the temperature sender moved to a lower location:on the rear of the block-left side. It is easily seen. The 40 continued to have its sender in the same location. Check to see where your sender is. If it is way up under the hood, the temp guage showing hot is the nature of the beast. If it's on the lower rear, then you better find out why.

Something that you could do is to check the actual water temperature with a thermometer, and compare it to the temp guage reading. Run it while watching the thermometer, and if it gets 200+, shut it down. You've got problems. If it levels off 170-190, you're probably OK.

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Dan hill

09-30-2006 04:38:48




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 Re: John Deere m maybe running too hot! in reply to Lon in NE, 09-24-2006 13:42:55  
A meat thermometer will give a true reading of the temperature in the top tank of the radiator.This is the first check I make on over heat complaints.Buy one for 4.00 in a grocery store or 25 cents at yard sales.



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John dear

09-24-2006 07:32:18




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 09-23-2006 04:12:56  
If it isn't boiling the water I wouldn't worry about it. 200 degree operating temp is much better than 150. A cold running motor doesn't make its full power potentional nor does it ever get a chance to evaporate or "cook off" the moisture that accumates in the crankcase.

With the bottom radiator hose off hold your hand over the lower neck and fill the radiator with water. Move your hand and see if you get a full flow of water (should be a stream as big as the neck and strong) or if it runs out slowly. If you get a full stream the radiator is probably OK. Weak stream then it needs to be rodded out. Was the block pressure washed good when the engine was rebuilt? They tend to fill up with dirt dobbers when apart also and could be contributing to your problem.

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Kurt_JDB

09-23-2006 12:08:59




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 09-23-2006 04:12:56  
Did you premix the antifreeze with water before you filled the system? If you add all the antifreeze and then the water, the system will not thermosiphon properly, and will quickly raise the temperature at the engine. I had this happen to me on my B.

I drained the coolant into some five gallon buckets and poured it back and forth between buckets to mix.

you might try this before pulling the radiator.

Good Luck,

Kurt

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Scott in WI

09-23-2006 06:46:09




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 Re: John Deere m maybe running too hot! in reply to Cassie Cottingham, 09-23-2006 04:12:56  
The M's cooling system is not pressurized so changing the cap would do nothing. The system also runs on the principal that hot water will rise trough the engine. This tends to make an M run on the warmer side to start with so if their is any restriction in the radiator will cause the tractor to run hot. So the first step would be to take your radiator to a garage and have them cook the radiator out this will clean out the rust scale that has accumulated in the radiator tubes, this proucedure straitend my M out it was running about 210 F and now is running around 170F. Some other things to varify are make sure that the hoses leading to and from the radiator are in decent shape. The only other things that you could look at would be make sure the fan belt is tight and the fins on the radiator are not blocking air flow.

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