Thermostat help?
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Cross-Country
Joined: Feb 2012
Posts: 68
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Thermostat help?
My old has rubber around it but it needs to be replaced. I cant find one. The dealer doesn't show one. Should one have come with the new stat? Would love to get it back together this weekend. What does the rubber do anyway? To me it just looks like it helps keep the stat centered when you put it back together.
Postmaster
Joined: Feb 2011
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first things first, did you buy a motorcraft (or international) thermostat, or some other brand? if its any other brand, take it back and get the motorcraft one. it really does matter.
from there, all engines i've worked on use either a paper gasket plus silicone or something that resembles an o-ring with a slot on the inside that slips over the thermostat. never had it off my 6.9, so i'm not sure which it is. either way, gotta have what its gotta have to make sure it seals.
a quick check at oreillyauto.com shows that there is a rubber seal like you described, and it comes with their house-brand thermostat, which is the only one they list.
so in short, find that rubber, its the seal and you gotta have it
from there, all engines i've worked on use either a paper gasket plus silicone or something that resembles an o-ring with a slot on the inside that slips over the thermostat. never had it off my 6.9, so i'm not sure which it is. either way, gotta have what its gotta have to make sure it seals.
a quick check at oreillyauto.com shows that there is a rubber seal like you described, and it comes with their house-brand thermostat, which is the only one they list.
so in short, find that rubber, its the seal and you gotta have it
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Cross-Country
Joined: Feb 2012
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Yes I bought the motorcraft stat from the dealer. No rubber boot that goes on the bottom of it. My old stat that i just took out was a motorcraft stat that has a boot but needs replacing. when i talked to the dealer they dont show any kind of rubber boot. Now what?
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Cross-Country
Joined: Feb 2012
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I got another stat from the dealer that has a boot!! I was happy till i tried to install it. Can someone help? Is the rubber suppose to fix snug when you install the stat? There's a good size gap with mine
and wouldn't seal anything.
and wouldn't seal anything.
Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
Motorcraft RT1049
there is black rubber or something wrapped on it,but im not sure why your worried about it.just toss the thing in there and run 'er.
the gasket that comes with it,is what seals the goose neck.
i was just reading on oilburners where someone says they like to remove the rubber to help keep the engine run cooler - i wouldn't dream of such an action.you want her running 200-210 most of the time to help ensure max efficiency.strange how some people are so afraid of letting their idi run upwards of 220-235 when working 'em good.these are not gas jobs.
i just had to replace mine,and got a bad one right out of the box.thought for sure it must be a water pump issue so replaced that and still same issue haha.so i got another rt1049 (looked the same of course) and that one cured what ailed her.
there is black rubber or something wrapped on it,but im not sure why your worried about it.just toss the thing in there and run 'er.
the gasket that comes with it,is what seals the goose neck.
i was just reading on oilburners where someone says they like to remove the rubber to help keep the engine run cooler - i wouldn't dream of such an action.you want her running 200-210 most of the time to help ensure max efficiency.strange how some people are so afraid of letting their idi run upwards of 220-235 when working 'em good.these are not gas jobs.
i just had to replace mine,and got a bad one right out of the box.thought for sure it must be a water pump issue so replaced that and still same issue haha.so i got another rt1049 (looked the same of course) and that one cured what ailed her.
Fleet Owner
Joined: Jul 2006
Posts: 20,345
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From: Mi'kma'ki
your worrying too much brother.
if it's Motorcraft RT1049 it's correct.no other t-stat is correct.it's really that simple.don't worry about how it's made.trust the ford engineers.they know what they were doing,and these engines have been running proven for several hundred thousand miles with this t-stat without over heating when working correctly.
if it's Motorcraft RT1049 it's correct.no other t-stat is correct.it's really that simple.don't worry about how it's made.trust the ford engineers.they know what they were doing,and these engines have been running proven for several hundred thousand miles with this t-stat without over heating when working correctly.
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Freshman User
Joined: Feb 2012
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I replaced my t stat a few months ago and noticed the same thing. The old t stat that I pulled out of the truck had a rubber boot around the bottom. The new rt1049 motorcraft I put in had no rubber boot at all.
I only have the stock temp gauge to go by and I'm not sure how accurate it is but it runs MUCH cooler than before. With the old t stat the needle would sit in the middle of the gauge and now it barely gets past the bottom end of the operating temperature range. I'm thinking there is so much coolant bypassing the t stat that the engine can't get to operating temp.
Shouldn't there be some sort of seal on the t stat? Mine is just metal on metal, is that normal? I've never replaced one before so I don't know.
I only have the stock temp gauge to go by and I'm not sure how accurate it is but it runs MUCH cooler than before. With the old t stat the needle would sit in the middle of the gauge and now it barely gets past the bottom end of the operating temperature range. I'm thinking there is so much coolant bypassing the t stat that the engine can't get to operating temp.
Shouldn't there be some sort of seal on the t stat? Mine is just metal on metal, is that normal? I've never replaced one before so I don't know.
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Lead Driver
Joined: Apr 2008
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A new one should have a little rubber sleeve around the lower half, there is also a large o-ring that seals the t-stat to the block. I got mine from Ford and it came with the sleeve glued on and the o-ring in the box.
Mountain Pass
Joined: Oct 2000
Posts: 180
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From: Backwoods Massachusetts
New Motorcraft looks just the same as the Stant but comes with a rubber gasket, no o-ring, no plastic wrap as seen on the pic at Rockauto. Not sure what I'll find when I dig into this....
Best,
- Jeff
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