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Thermostats

Posted By dayradebaugh Tuesday, July 30, 2019 10:46 AM
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dayradebaugh
 Posted Tuesday, July 30, 2019 10:46 AM
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Hi Guys:

Got a '51 GMC 620 w/360" gas engine. Need thermostat. Anyone know of a supplier that might carry these old-time things?

Thanks

Day Radebaugh

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Geoff Weeks
 Posted Tuesday, July 30, 2019 1:43 PM
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Best bet is to look at the diameter and how the coolant is routed, and go look in a catalog, it is how I found one for my 1940 Buda engine. You'll want a 180 deg minimum, and 192 is even better. Don't fall for the story that they'll overheat and you need a 160, the thermostat only sets the minimum temp, and with todays coolant, 180 or 192 is best.
Just pay attention to how the coolant flows both with the 'stat closed and when it opens, My Buda had the bypass out the side of the 'stat (odd, but early Chry products did also). Also if the 'stat is not down in the head, but in a housing above it, it may need a small bleed hole to allow hot coolant up to open it. (if there isn't a bypass connection at the 'stat)
Once you know this, you can look through a catalog, or I can try and find mine, and look for 'stats.
dayradebaugh
 Posted Thursday, August 01, 2019 4:05 AM
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Thanks, Geoff. I'm on the road at the moment, but I've been moving along these lines in the meantime. I gave up on the various internet shops, NAPA and the rest, and called Stant tech support. He advised me to get measurements, take a picture, and send it to him, where he would try to match it with a pic in a catalog, maybe the same one you have, so I will do that when I get back to the shop.

Appreciate your advice on stats. Stat is not down in the head, and does have a little bleed hole, whose purpose I did not understand until you explained it. The stat is supposed to bleed out the side to go into the bypass and back in the engine until the unit opens.

Will post pix and measurements soon. The stat did not survive its removal, but I can patch it back together for a pix.

Thanks for your help.
Geoff Weeks
 Posted Thursday, August 01, 2019 4:31 AM
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The one for my Buda looked alot like a "conventional" stat that had a brass "skirt" added to the bottom with a slot in it for the bypass return. The top of the stat had a rubber ring to seal it to the outlet. Cold, the coolant came up and out the side to the bypass, warm it would follow the bigger and less restricted flow to the radiator.
Bleed holes have two purposes. one is to bring some of the hot coolant up to a remote stat, but also to allow any air that got trapped in the cooling system to work its way to the top radiator tank, even if the stat is closed. It prevents air from insulating the stat from coolant temps.
Since the advent of the Weirstat design, where hot coolant exits the middle and bypass is straight thru, and the movement of the 'stat both opens the passage to the radiator AND restricts the passage to the bypass at the same time, the old type I have has fallen from favor. It requires a housing designed for it however, and can not be retrofitted easily.
cat herder
 Posted Thursday, August 01, 2019 1:17 PM
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Day, first, nice looking GMC .there is a group on facebook called fat cab and cannonball site ,there are big gas jobs on that site all gmc. maybe those guys can help. and if not there are some great trucks to look at. also check with junk man dan gmc guru. I am a fan i have a 51 1 ton, it was at 2018 aths show, good luck with your truck.
cat herder
 Posted Thursday, August 01, 2019 1:17 PM
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Day, first, nice looking GMC .there is a group on facebook called fat cab and cannonball site ,there are big gas jobs on that site all gmc. maybe those guys can help. and if not there are some great trucks to look at. also check with junk man dan gmc guru. I am a fan i have a 51 1 ton, it was at 2018 aths show, good luck with your truck.
dayradebaugh
 Posted Thursday, August 01, 2019 2:25 PM
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Guys:

Very helpful comments. Dragged this GMC out of the mud about 10 yrs ago. Did everything except get into the engine. She's a good truck, and found an old dump bed off a farmer truck out here and put it on. Big accomplishment, over the years, was converting air shift 2-speed rear end to electric shift, accomplished with a good bit of help from oldgmctrucks.com and weller in grand rapids, mi.

This stat business has me stumped, and I appreciate the comments. Clearly there's a lot more to know about stats than I'm aware of. I'll post a pic next week, and continue to smarten up with your help.
dayradebaugh
 Posted Thursday, August 01, 2019 2:25 PM
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Last Active: Wednesday, October 02, 2019 6:29 AM
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Guys:

Very helpful comments. Dragged this GMC out of the mud about 10 yrs ago. Did everything except get into the engine. She's a good truck, and found an old dump bed off a farmer truck out here and put it on. Big accomplishment, over the years, was converting air shift 2-speed rear end to electric shift, accomplished with a good bit of help from oldgmctrucks.com and weller in grand rapids, mi.

This stat business has me stumped, and I appreciate the comments. Clearly there's a lot more to know about stats than I'm aware of. I'll post a pic next week, and continue to smarten up with your help.
dayradebaugh
 Posted Thursday, August 01, 2019 2:25 PM
.

. - (6,309 reputation). - (6,309 reputation). - (6,309 reputation). - (6,309 reputation). - (6,309 reputation). - (6,309 reputation). - (6,309 reputation). - (6,309 reputation). - (6,309 reputation)

Group: Forum User
Last Active: Wednesday, October 02, 2019 6:29 AM
Posts: 54, Visits: 949
Guys:

Very helpful comments. Dragged this GMC out of the mud about 10 yrs ago. Did everything except get into the engine. She's a good truck, and found an old dump bed off a farmer truck out here and put it on. Big accomplishment, over the years, was converting air shift 2-speed rear end to electric shift, accomplished with a good bit of help from oldgmctrucks.com and weller in grand rapids, mi.

This stat business has me stumped, and I appreciate the comments. Clearly there's a lot more to know about stats than I'm aware of. I'll post a pic next week, and continue to smarten up with your help.
Geoff Weeks
 Posted Friday, August 02, 2019 1:37 AM
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Ha, H, I would have converted the 2 spd the other way, from electric to air! Much more reliable in my opinion. I have 3 vehicles with 2 spd rears, two of them are vacuum and one is air, but it is a tandem, so two shift motors.
My air tandem is electric over air, so the "button" on the shift stick is electric, with a solenoid valve toward the rear that supplies the air to shift into high.
Of course I have Eaton's so that may make a difference, Parts are readily available, I know GMC made their own with a different shift motor assembly.
Friday, August 02, 2019 3:39 AM by Geoff Weeks

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