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Temp gauge fix?

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Adam Courtney

10-16-2000 10:56:37




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I got my '51 model A running for the first time in 18 years yesterday, and it runs absoulutely great, but I have a couple of questions...I'm not shure if the temp gauge works... I let it sit and run for about a half hour, and all the further the temp gauge came up was about 180 degrees.. I took off the radiator cap and felt the water, and it felt hot but not so hot that it would burn me... I guess what I'm asking is that should this tractor warm up at least 200 degrees when it's been running for half an hour with the radiator cap off????? How Do I know when I'm overheating? Thanks.

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Adam Courtney

10-18-2000 06:39:20




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 Re: temp gauge fix? in reply to Adam Courtney, 10-16-2000 10:56:37  
I took the "A" out yesterday and hooked it up to an 8 foot disk and pulled it in 3rd and 4th gear for awhile. The temp came right up around 210 degrees, right where it should be.. When I unhooked it settled right around 180. Now the only problem I have is a leak in the radiator!



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Dave Kolby (Florida)

10-16-2000 16:39:03




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 Re: temp gauge fix? in reply to Adam Courtney, 10-16-2000 10:56:37  
I don't know about the 50 model A but mine is a 1948. They do not have a thermostat, or water pump, only shutters. At idle on a hot summer day (90's) she will only read about 170. That's why JD put the shutters on and the shutters should be set up to run at 180, must be if running kerosene on the all-fuel ones. Work it a while hard with the shutters open and it will run hotter.

Dave



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G Taylor

10-16-2000 15:14:03




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 Re: temp gauge fix? in reply to Adam Courtney, 10-16-2000 10:56:37  
Using a candy thermometer what is the actual water temp in the rad top. Unless proven by stirring the temp probe in a pot of actively boiling water and it reads 212F don't trust it. A 49 year old gauge maybe out of calibration.



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G Taylor

10-16-2000 15:11:27




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 Re: temp gauge fix? in reply to Adam Courtney, 10-16-2000 10:56:37  
Are the shutters working allowing the rad airflow to be controlled?



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Adam Courtney

10-16-2000 17:33:08




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 Re: Re: temp gauge fix? in reply to G Taylor, 10-16-2000 15:11:27  
My "A" is a '51, and doesnt have "shutters" that I know of. It just has a front end piece and the hood... no flaps no thermostat... Mine works on the "burp system"



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G Taylor Burp system?

10-16-2000 21:20:32




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 Re: Re: Re: temp gauge fix? in reply to Adam Courtney, 10-16-2000 17:33:08  
Burp system?



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Adam Courtney

10-17-2000 06:30:51




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 Re: Re: Re: Re: temp gauge fix? in reply to G Taylor Burp system?, 10-16-2000 21:20:32  
The Burp system has no thermostat, and no water pump. when the water around the engine block gets hot enough it "burps" itself up into the radiator and then cool water comes in from the radiator through another hose. This is the only way water circulates in these tractors.



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G Taylor burps are not good

10-17-2000 11:50:45




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 Re: Re: Re: Re: Re: temp gauge fix? in reply to Adam Courtney, 10-17-2000 06:30:51  
If the thermosyphen system is forming steam pockets there are problems already with new ones to follow. If it's forming steam other than a little nucleate boiling adjacent to the hot castings there are problems several areas. The flow and heat transfer is being restricted by probably 50 plus years of lime and calcium scale precipitated out of the coolant . Does the coolant in the engine has too low a boiling point of only 212F at sea level. What is the coolant delta T across the rad core? Don't know your elevation but 70% ethylene glycol 30% water boils at 239F , better yet with a new working rad cap. Or the non poisonous propylene glycol that also doesn't ruin bearings boils pure at 360F. There are cracked/warped castings and blown head gaskets coming your way sooner or later. Steam,air,vapour is a poor conductor of heat compared to liquid. Thermal stress is enormous when part of a casting is cooled by liquid and has only steam against rest of the casting without cooling .

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JDBob

10-16-2000 11:28:41




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 Re: temp gauge fix? in reply to Adam Courtney, 10-16-2000 10:56:37  
Adam, your A is probably doing fine. Glad to hear you've got her running again after that many years. None of my A's run very hot at all without putting a load on them. Sitting and at idle won't warm them up very much. At idle my A's stay around the 130-140 degree mark. I've ran them in some parades and tractor games when it is pretty hot outside (90-100 degrees), then they would run on up about the 160-170 mark. If the tractor sat that many years it is possible that it has rust/scale around the cylinders on the inside of the block which would not let it cool as effiecently.
Hope this helps you a little.
JDBob

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Haybaler

10-17-2000 10:33:11




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 Re: Re: temp gauge fix? in reply to JDBob, 10-16-2000 11:28:41  
Hey JD Bob when you gonna let me hook a disk up to your A?? Man we need to burn the paint off of the manifold!!!



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Adam Courtney

10-16-2000 14:43:23




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 Re: Re: temp gauge fix? in reply to JDBob, 10-16-2000 11:28:41  
well, that's about all it was running, 170 degrees, at idle... Mabe I'll hook it up to a disc and pull it hard and see what happens! Thanks for the imput



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