Vaanth
Well-Known Member
"Supposed to"
Thermostat replacement
- Thread starter cruiser
- Start date
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"Supposed to"
I guess. lol
slantsixdan
=..=
Well, ****. Sorry about my lapse of manners. I didn't hafta be a dick about it.
slantsixdan
=..=
A thermostat illustrated on an underhood decal? Interesting, never seen or heard of before, got a pic? Sounds like the kind of thing Jim Osborn would have reproduced, but I don't see it in his cattledog. Seems like a weird thing to put underhood—like, I don't see decals with pics of spark plugs, air filters, breaker points, or other parts.
"Supposed to".
Yeah it's around here somewhere. I tried to find it yesterday with no luck.
cruiser
Well-Known Member
Just replaced the stat with a NAPA "premium" 195 degree stat. Drilled an air hole at the 12 o'clock position before installation, as recommended by slant six Dan. Works fine, except it regulates the temp to 185, even though it's a 195 stat. Not sure if the car can tell the difference of 10 degrees. Does 10 degrees make a difference one way or another? Doesn't overshoot like the old stat did, which is nice.
PS: Didn't the slant six use a 185 degree stat until 1973, then went to the higher (195) temp in 1974 to cut emissions?
PS: Didn't the slant six use a 185 degree stat until 1973, then went to the higher (195) temp in 1974 to cut emissions?
That sounds correct. The thermostat rating has nothing to do with how hot the engine runs. The rating is the temp at which the thermostat opens. The rest is up to the cooling system.
cruiser
Well-Known Member
I guess I don't really understand how the thermostat interfaces with the cooling system. Attached is a photo of my fully warmed up temp gauge at highway speed, outside temperature of 25 degrees F. I thought that the thermostat remained closed until the coolant in the cylinder head adjacent to the stat reaches 195. It then meters open and closed, regulating the coolant flow to the radiator to keep the temp at 195. As you can see, my temperature when fully warmed up is 185. So is this stat working correctly? The temp gauge is very accurate, BTW, so the reading that you're seeing is correct. I ought to know this by now, as this is my fourth slant six! Can someone explain?
Oh, one more thing, by the way. The hole that I drilled in the stat plate prior to installation seemed to really help discharge any trapped air from the system. Oddly, the FSM says to install the stat with the relief hole in the 12 o'clock position, but the accompanying photo in the FSM shows no such hole in the slant six stat. Hmmmm....
Oh, one more thing, by the way. The hole that I drilled in the stat plate prior to installation seemed to really help discharge any trapped air from the system. Oddly, the FSM says to install the stat with the relief hole in the 12 o'clock position, but the accompanying photo in the FSM shows no such hole in the slant six stat. Hmmmm....
slantsixdan
=..=
Read this.
Can't tell how you're measuring to know your engine is running at 185° versus 195°—that takes something a whole lot more accurate and precise than the engine temp gauge on the dashboard—but I wouldn't fret about it.
I have to agree the OEM temp gauge can not be used to tell the temp.
You can calibrate it (sort of) by looking at a position such as straight up. And then measuring the temp of the sender.
On my 67 dart 273, when the outside air temp is 70 to 90 the gauge sits at 3 line widths past the low normal on the 67 offset normal gauge.
When it's below 40 it just gets to the low normal line. I measured it the other day and it measured 175. That's with a 185 thermostat. So basically the engine would get enough cooling from a trickle through he radiator.
You can calibrate it (sort of) by looking at a position such as straight up. And then measuring the temp of the sender.
On my 67 dart 273, when the outside air temp is 70 to 90 the gauge sits at 3 line widths past the low normal on the 67 offset normal gauge.
When it's below 40 it just gets to the low normal line. I measured it the other day and it measured 175. That's with a 185 thermostat. So basically the engine would get enough cooling from a trickle through he radiator.
340demon72
Well-Known Member
Hey RRR, when ya gona bury that poor kitty??? 
LOL That's how she sleeps. She's a professional.Hey RRR, when ya gona bury that poor kitty???
cruiser
Well-Known Member
BTW, here's a photo of my 195 degree Stant Super Stat that turned out to be not very super. Failed on me after only two years. So much for the Stant units being the best.
As corny as it sounds, when I have to use that style, I've had great luck with Edelbrock thermostats.
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