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JD 401B temperature

3

37chief

Well-known Member
Location
California
I installed a new radiator in my 401B. The thermostat opens in a pan of hot water. When installed on the motor the water doesn't circulate, the bottom radiator hose stays cold, but the top radiator hose and the top tank are hot, so the thermostat must be opening. If I take the thermostat out, the water circulates fine, the bottom hose gets hot. The temp gage is 2/3 to the red with the thermostat installed now. When I start using it in the summer it looks to me like it will go almost red like last year. What would happen if I run without a thermostat in the summer? Stan
 
Sounds like the thermostat is regulating flow as the engine temp rises. With no thermostat would be steadily circulating a greater flow of coolant, regardless of engine temp, so the whole radiator would warm, where it might not with the thermostat in reducing the flow. The coolant could be losing temp as it goes through the radiator, as it should, so cool coolant returns to the engine. Did you check the opening temperature of the thermostat when you had it in the pan of water? Have you verified that your tractor temp gauge is reading correctly? Having only the colors on the gauge you need to see what the degrees are compared to the color ranges for reference. Gauges have been known to loose calibration. Using a lower opening temp thermostat would be better than no thermostat. JMHO
 
Had a truck that would overheat in the summer and never
raise the temp gauge in the winter. Found that someone
had removed the t-stat.
Water went thru the engine too fast to remove heat in
the summer. Doesn't sound right but a t-stat solved both
problems.
 
I have one tractor that the temp gauge reads on the high side all the time . If your Just idling the tractor not under load you may not get it warm enough to open that?s where an infared thermometer comes in handy
 
Jim. You were right about the gage. Probably the original gage in the tractor. It was reading high.
When near the read, I was expecting the thermostat to open. It wasn't time for it to open. I had a new gage. (I'm surprised I found it) It's a number gage. I checked it in a pan of water. It was reading very close to the thermometer. What I thought was a heating problem, may have been a bad reading gage. I may not have needed a new radiator. At least I have a new radiator made in Turkey. What can go wrong with that? Plus hours changing it. I needed something to do anyway. Stan
 
Jim. You were right about the gage. Probably the original gage in the tractor. It was reading high.
When near the read, I was expecting the thermostat to open. It wasn't time for it to open. I had a new gage. (I'm surprised I found it) It's a number gage. I checked it in a pan of water. It was reading very close to the thermometer. What I thought was a heating problem, may have been a bad reading gage. may not have needed a new radiator. At least I have a new radiator made in Turkey. What can go wrong? Plus hours changing it. I needed something to do anyway. Stan
 
(quoted from post at 22:42:22 01/24/20) Jim. You were right about the gage. Probably the original gage in the tractor. It was reading high.
When near the read, I was expecting the thermostat to open. It wasn't time for it to open. I had a new gage. (I'm surprised I found it) It's a number gage. I checked it in a pan of water. It was reading very close to the thermometer. What I thought was a heating problem, may have been a bad reading gage. may not have needed a new radiator. At least I have a new radiator made in Turkey. What can go wrong? Plus hours changing it. I needed something to do anyway. Stan
Click to expand...

Good to hear that is all it was, not something more serious. Given the quality of many new gauges it is a good idea to check them as well. If you still have your old radiator you could have it cleaned and tested, ready to go as a spare if needed.
 
I took the radiator to a shop to have it checked. They said it needed to be replaced. Now I wonder if it was as bad as they said. It did have some damage on the front where the previous owner had it repaired. It looked like the fan may have hit it, bit it didn't leak. I still have it. This new radiator will probably last as long as me. I have a mowing job next week, and will see just how things go. Stan
 
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