Thermostat- I have an issue with this design - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 11-15-2019, 02:50 PM Thread Starter
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Thermostat- I have an issue with this design

So you take off the hose.
Then next ts the metal flange with 3 bolts.
Then down from that is a wee little gasket.
Then is the thermostat.
Then something should go here, but its not here.
Then is the water pump with the recessed seat area.

Shouldnt there be another gasket between the water pump seat and the thermostat?
How does this not leak?

Im used to seeing a thermostat with the one gasket that sits on both sides/surfaces of the thermostat.

The 7.3l themostat is bare, no gasket when you order it?
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post #2 of 10 Old 11-15-2019, 04:01 PM
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Years ago the seal was part of the thermostat, it actually fit around the edge. Now the seal sits on top of the thermostat, I'm not fond of this way but with a little bit a grey sealant you are good to go.

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post #3 of 10 Old 11-15-2019, 05:18 PM
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Search RT1201

Pretty sure that the one for the super duty 7.3s. The Motorcraft ones have the gasket built into the t-stats. Get the OEM.

1997 F350 CCLB 7.3
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post #4 of 10 Old 11-15-2019, 06:04 PM Thread Starter
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But dosn’t the thermostat NEED a gasket on both sides?
There is water on both sides.
And as far as i can see (ive watched repair videos, and shopped parts) the botom side is metal against metal.

I did see, at rock auto, only one part, i think it was the motorcraft part you referenced, that had the old time wrap around gasket.

Every other auto source, you dial up the 2003, f250, 7.3.. and they serve you up a bare thermostat as the perfect fit.

Then if you want, you buy the little ring gasket extra.
You cant even find the wrap around gasket to buy if you wanted it.
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post #5 of 10 Old 11-15-2019, 07:33 PM
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the ford gas FE and 221-351 engines of the 60's and 70's never had a seal on the t-stat, just the housing. it doesnt need to be a complete seal.
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post #6 of 10 Old 11-16-2019, 05:55 AM
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I've always put water pump sealant around the outside of the o-ring when reinstalling....never had a leak on either truck.

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post #7 of 10 Old 11-16-2019, 08:57 AM
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I replaced my water pump early last year. I changed out the thermostat at the same time. I had to order two part numbers. One for the thermostat, and one for the seal that wraps around the outside of the thermostat.

The wrap-around seal also provides the seal for the metal hose outlet. If the incorrect seal, or any seal not installed correctly should result in a leak at the metal outlet.

Last edited by DaveP.; 11-16-2019 at 12:55 PM.
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post #8 of 10 Old 11-16-2019, 02:11 PM Thread Starter
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I would love to know the part number of the wrap around seal, because I spent a couple hours online and never saw it.
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post #9 of 10 Old 11-16-2019, 06:35 PM
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I looked in my files and couldn't find the receipt from the parts store. The guy is out of business, so i can't ask him.

I went on RockAuto and found lots of choices. The shipping is going to be more than the 12 cent part.

Those don't look like "wrap around", but I may be mistaken that the seal I was given was a wrap around. It may have been a square-cut like those in the link. All I remember for sure is that it wasn't fussy, I didn't use any additional sealant, and it didn't/doesn't leak.

If you use the square-cut, it goes on top of the thermostat, and be sure that it is a little "proud" of the surrounding surface so the metal hose fitting compresses it. You'll be fine.

Last edited by DaveP.; 11-16-2019 at 06:40 PM. Reason: removed link that didn't work after I closed my browser
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post #10 of 10 Old 11-16-2019, 07:38 PM Thread Starter
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Thanks for looking for the part number.

If i use the square cut ring gaskets, i will attempt to use 2 of them. One on the top surface of the thermostat, and one on the bottom. (Or some type of sealant as others have mentioned)

Otherwise, the system will leak.
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