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Correct thermostat for 258 ? |
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Mr. Ed
Supporter of TheAMCForum Joined: Nov/12/2010 Location: Sewell, NJ Status: Offline Points: 4916 |
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To add the degree symbol to a post, hold down the alt key while typing in 0186 lie this º.
Later! Mr. Ed |
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2014 Jeep Grand Cherokee Laredo "Gwendolyn."
1978 Concord Sport coupe "Mr. Black". 1982 Concord wagon. The Admiral. FOR SALE! 1976 Sportabout X, 304, auto, air. The Bronze Goddess |
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TH_Gremlin
AMC Nut Joined: Feb/08/2014 Location: Lewisville, Tx Status: Offline Points: 318 |
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Gonna be a few days before I can do a road test. I was removing the accelerator pedal (different venture, not involving the thermostat), and broke that little piece of plastic (that holds the accelerator cable) that snaps into the top of the gas-pedal lever. Ordered an accelerator cable, but it won't be here until Monday. Road test coming, hopefully, on Monday or Tuesday :)
I did change the temperature sending unit when I first got the car. At the time, I thought the sending unit wasn't working properly. I could ground the wire out, and it would peg the temp gauge. After replacing the sending unit, I concluded that the car just ran at a pretty low temperature, because it still just barely registered in the middle of the gauge. I did not know that the thermostat was completely gone at that time. Edited by TH_Gremlin - Oct/03/2014 at 12:48pm |
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TH_Gremlin
AMC Nut Joined: Feb/08/2014 Location: Lewisville, Tx Status: Offline Points: 318 |
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Haha, well I had a little issue with the 192 degree thermostat. Apparently it wasn't opening, because the car was overheating in about 5 minutes. I could grab the top radiator (return) hose, and it's cold to the touch. Same with the radiator. So I returned that thermostat, and got a new one (a 195 degree, with some weird brass wobble valve looking thing in it, where you would ordinarily drill the hole in the thermostat). Installed it with the permatex #2, let it cure, and whatta ya know, it works ! The temp gauge stays right in the middle, where it needs to be.
Between that, the rebuilt carburetor, and a score of other fixes, the car runs a heck of a lot better ! The car runs best with the timing advanced at about 25 degrees (I'm guessing, it's waaaay off of the meter), so I'm thinking maybe the rubber in the harmonic balancer might be losing its rubber, and has slipped a bit. Not sure, and that's a story for another time. Thanks for all of your help ! TH_Gremlin |
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6768rogues
AMC Addicted Joined: Jul/03/2007 Location: United States Status: Offline Points: 6241 |
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Most of what you said is correct. However, if a cooling system has the capacity to keep the engine at 190 degrees under certain conditions and a 205 thermostat is installed, it will run at 205 or higher. If a 170 thermostat is installed, it will run at 190, the capacity of the cooling system. Temperature differential is a factor in cooling capacity. A hotter radiator will shed more heat. However, a 230 degree radiator might shed 30 degrees resulting in a running temperature of 200 degrees whereas the same radiator on the same day running at 200 degrees might only shed 20 degrees, but the resulting temperature is 180 degrees. The cooler thermostat can result in cooler operating temps as long as the cooling system is capable of doing more work. That might be what you said, but it didn't sink in when I read it. |
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pacerman
Supporter of TheAMCForum Joined: Jul/03/2007 Location: United States Status: Offline Points: 9057 |
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A 205 degree thermostat begins to open at 205 degrees. I 190 degree coolant temp operating with such a thermostat will not open the thermostat. Joe
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