L2201 water temp sensor

Thanasis

New member

Equipment
Kubota L2201DT
Feb 21, 2021
19
0
1
Greece
Hallo everybody,

tried to hook an analogue water temperature gauge on my L2201DT. Pretty easy job but the readings are 40-45 Celsius when idle and 60 degrees under pressure. I tested the sensor before installing it and works fine. I use 50-50 water with antifreeze so I would expect a normal temperature at around 100 Celsius to 120 under load. The tractor works fine but I can’t figure out why I get these readings on the gauge.
Any recommendations are welcome!
 

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North Idaho Wolfman

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Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
21,757
430
83
Sandpoint, ID
EDITED:

100c would be 212f
120c would be 248f
Yes, that range would be on the mark.
 

Thanasis

New member

Equipment
Kubota L2201DT
Feb 21, 2021
19
0
1
Greece
45C to 60C is right on the mark.
That is about 113f to 140f

100c would be 212f
120c would be 248f
Both of those you would have a Junk tractor, well a blown or cracked head!
On a post for the l1501 which is the 2 cylinder version of mine 110 Celsius is mentioned as the normal operating temperature. Isn’t 45-50 Celsius a little bit low for an engine?
 

North Idaho Wolfman

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L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
21,757
430
83
Sandpoint, ID
Sorry, yes your right I got lost in the conversion.

220F is optimal.

Check the cooling fluid level.
Does your model have a water pump?
 

Thanasis

New member

Equipment
Kubota L2201DT
Feb 21, 2021
19
0
1
Greece
Sorry, yes your right I got lost in the conversion.

220F is optimal.

Check the cooling fluid level.
Does your model have a water pump?
Fluid level is fine. I believe there is a water pump but since the tractor is not overheating I can’t see why would it be the problem. My guess is that for some reason the sensor can’t pick the true temperature. So far without the gauge I never had issues.
 

ctfjr

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L3800HST
Dec 7, 2009
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central ct
Is it possible your sensor and display are mismatched?

That brass piece is just a well??? If so perhaps some heat conductive grease in there might help.

Before you go crazy though, can you remove the sensor and insert it in a pot of boiling water?
 

Thanasis

New member

Equipment
Kubota L2201DT
Feb 21, 2021
19
0
1
Greece
Is it possible your sensor and display are mismatched?

That brass piece is just a well??? If so perhaps some heat conductive grease in there might help.

Before you go crazy though, can you remove the sensor and insert it in a pot of boiling water?
The gauge is analog so the sensor with its cable is preattached to the gauge. I already tested the sensor and works fine. The grease is a good idea though.
 

BX'r

New member

Equipment
BX2370
Jun 13, 2020
29
2
3
ipsc
How far does the sensor protrude through the brass fitting, is it submerged in the water?
Could there be air trapped in there?
 

Thanasis

New member

Equipment
Kubota L2201DT
Feb 21, 2021
19
0
1
Greece
Update,

I used some heat conductive grease but still the temp is 45-50 Celsius and 60-65 under load. The responsiveness though improved. A mechanic told me that it could be normal for old tractors like mine. I am not sure what to believe. I could try a new brass fitting that goes even deeper or make one where the sensor itself will be directly into the water.
 

North Idaho Wolfman

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Staff member
Lifetime Member

Equipment
L3450DT-GST, Woods FEL, B7100 HSD, FEL, 60" SB, 743 Bobcat with V2203, and more
Jun 9, 2013
21,757
430
83
Sandpoint, ID
Update,

I used some heat conductive grease but still the temp is 45-50 Celsius and 60-65 under load. The responsiveness though improved. A mechanic told me that it could be normal for old tractors like mine. I am not sure what to believe. I could try a new brass fitting that goes even deeper or make one where the sensor itself will be directly into the water.
Yes, I would do that as all the sensors that I've seen are much longer.
 

Thanasis

New member

Equipment
Kubota L2201DT
Feb 21, 2021
19
0
1
Greece
Major update, there is no thermostat at all installed. Someone removed it with its housing and welded a pipe that goes to the radiator. I will order a new housing and a new thermostat and see how the sensor reacts.
 

Thanasis

New member

Equipment
Kubota L2201DT
Feb 21, 2021
19
0
1
Greece
Latet update,

the sensor works fine. The small tempertures I used to see were due to the combination of cold weather and the lack of a thermostat. Now with outside temp from 20-26C when I use the bush hog it goes up to 100-105C.