Temp Gauge on 46 H

Illinois Farmall · Mar 18, 2010

The temp gauge on my 46 H isn"t working and I"m wondering if it"s usually the gauge itelf that doesn"t work of if there is a thermcouple that is associated with it? If so, can you change out either item or is it a complete unit? Thanks for the help.

glennster · Mar 18, 2010

its a complete unit with the thermocouple. pretty easy change out. they sell the gauges on this site, your case i-h dealer will have em or if you want an original looking one, oem tractor parts has em.

Bob M · Mar 18, 2010

The temp gage is a sealed assembly. It's actually a pressure gage connected to a sensing bulb that filled with low boiling temperature working fluid. The fluid pressure increases with bulb temperature and the gage reports it as temperature.

Generally gage failure is from when the fluid leaking out. Only fix is to replace entire gage and bulb assembly.

GordoSD · Mar 18, 2010

Perhaps it is working. It takes quite a while for my H to show any rise in temp if I am not "working it". Could be a tstat problem. Run the tractor for awhile, pull the radiator cap and stick a finger in there, CAREFULL. If it;s cool, warm, hot , or very hot, that will give you a baseline.

Gordo

Pat-CT · Mar 18, 2010

Its probobly working. H's dont really warm up quickly, I can run my H this time of year for a half hour or so before the temp needle will start to rise. Its could be your thermostat but just know that it takes a long time for an H to warm up pretty good

Ed Hotaling · Mar 19, 2010

I have to agree with Pat. I had my H for several years before I worked it hard enough to move the temp. needle. Someone posted a while back about the super effective cooling systems on these old tractors. That's why so many of them are still running.

Farmallhal · Mar 19, 2010

You might try starting it and placing a heavy piece of plastic over the grill to cut off the fan from pulling air through the radiator. That is about the only way I can warm mine up when I run it during the winter for an hour or so every couple of months. Hope this helps and it would verify if you get any movement on the gage, Hal.

pete 23 · Mar 19, 2010

The reason the H and M don't warm up under no load is leakage past the thermostat internally. The housings never sealed 100% even new, and as they rust away inside, coolant just goes on around. I have sealed a later model like 450 by having a machine shop cut a groove to install a seal that fits outer dia of thermostat. The older housings don't have enough material inside them to do that, so I jerry rig a o-ring , washer and spring to seal them off. Works good to get them to warm up.

Temp Gauge on 46 H

Illinois Farmall

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glennster

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Bob M

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GordoSD

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Pat-CT

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Ed Hotaling

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Farmallhal

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pete 23

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