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Harry Ferguson Tractors Discussion Forum
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any ideas on testing a temp gauge?

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Mark from the f

02-07-2008 17:05:20




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Howdy fellas, I have my fathers original green and grey TO 35 (585 hours) with all original gauges. However, I'm leary on my temp gauge. She doesnt want to come up to normal operating temp. She does come up (so I know shes not totally dead) off the baseline and stop right at the beginning of "Normal Range". I put her to work last week snow plowing 3 hours worth, and still not into normal. She rarely gets "worked" except last summer I put the 5' tiller on her and off we went. On then did she cross into the normal zone.
I was wondering is anyong has dropped the probe into boiling water or some other trick?
I don't want to replace with NEW looking gauge, but I also dont want to "cook" her if the gauge is starting to fail. I'd like to check gauge before I start replacing thermostat. Put a new one in 3 years ago, so I dont think thats it. Should I go for a hotter thermostat? I'm open to suggestions.
Thanks for any help. Mark

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Dell (WA)

02-08-2008 21:26:59




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 Re: any ideas on testing a temp gauge? in reply to Mark from the fort, 02-07-2008 17:05:20  
Mark..... ....heres the "eazyway" to check yer thermostat operation. BLOCKOFF the radiator with piece of cardboard. Work yer tractor and watch yer gauge. Iff'n it don't gitt mid-scale inna'bout 1/2-hr, I'd suspect bad indicator. Iff'n it don't gitt more'n you've been seeing, suspect yer thermostat is OPEN and needs replaced. Simple, eh?..... ..HTH, Dell



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Jeff-oh

02-08-2008 05:46:24




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 Re: any ideas on testing a temp gauge? in reply to Mark from the fort, 02-07-2008 17:05:20  
How about taking the radiator cap off. Starting and running the engine while holding the thermometer in the radiator fluid. Thus, you should see it stay steady while the thermostat is closed then start to rise quickly when the thermostat starts to open and you can like wise watch the temp-gauge.

I lack the knowledge if running with the radiator cap off is a good idea, but otherwise it is a way of testing both the thermostat and the gauge.

Jeff

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Jerry/MT

02-08-2008 11:22:19




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 Re: any ideas on testing a temp gauge? in reply to Jeff-oh, 02-08-2008 05:46:24  
Temporarily running with the cap off is OK. You just don"t want to be working it hard with the cap off or have a malfunctioning pressure cap because it lowers the pressure in the cooling system and thus the coolant boiling point and when the coolant starts to boil, it cannot transfer as much heat.



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Jerry/MT

02-07-2008 21:32:01




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 Re: any ideas on testing a temp gauge? in reply to Mark from the fort, 02-07-2008 17:05:20  
I was plowing snow on Monday and I don"t consider that really working my TO-30. However, the needle moves about 1n eighth of an inch into the "normal band" when the engine reaches the staedy state operating temperature. It"s similar in the summmer when I am hauling the pipe trailer around. I imagine if it was 90F and I was plowing the back 40 I could get it further into the "normal band". Sounds like your is the same.

If you are worried, with a cold engine, remove the cap and operate til it reaches stseady state operating temperature and then stick a thermometer in the fluid and measure the temperature. You"ll have a one point calibration of the temp gauge.

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Richard L

02-07-2008 17:59:36




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 Re: any ideas on testing a temp gauge? in reply to Mark from the fort, 02-07-2008 17:05:20  
Mark you say the t'stat is 3 years old. is it possible it may not be shutting completely and not letting the water get up to temp? when you start it cold make sure there is no water movement in the radiator by removing the cap and looking in the top. If no movement I would guess the t'stat is probably ok. just my 2 cents Richard



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EK in MO

02-07-2008 17:55:06




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 Re: any ideas on testing a temp gauge? in reply to Mark from the fort, 02-07-2008 17:05:20  
If this tractor is supposed to have a thermostat, it sounds like it is either stuck open or may have been removed. I had a Ford 961, without a thermostat and this is exactly the way it registered.



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stan stenerson

02-07-2008 17:51:01




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 Re: any ideas on testing a temp gauge? in reply to Mark from the fort, 02-07-2008 17:05:20  
Probsbly use the wife's cooking thermometer to verify water tempature. Our's reads from 100 to 400 degrees F.



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Bundee

02-07-2008 18:12:13




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 Re: any ideas on testing a temp gauge? in reply to stan stenerson, 02-07-2008 17:51:01  
put a thermometer in the radiator,the type Mark
suggests.check the stat' same way in a glass,record temp when it opens .also check when cooling.maybe the incorrect one for cold weather.



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Bundee

02-08-2008 02:02:35




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 Re: any ideas on testing a temp gauge? in reply to Bundee, 02-07-2008 18:12:13  
Errata... delete Mark insert Stan.



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