thermostat
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New User
Joined: Nov 2008
Posts: 10
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From: safford
thermostat
I bought a 84 f250 last june it always ran kinda hot didnt drive it that much, looked in the radiator and there was all kinds of junk figured that was the problem. So the other day I swapped radiators and flushed the system while I was flushing it the truck got really hot and started blowing bubbles out between the head and the intake manifold at the #1 cyl. replace thermostat found out the one that was in it was from a gas motor 
replaced it with a thermostat from ford. Just wondering how much damage could have happened and if I should start working on the parts truck instead. Theres no water in the oil, only the smell of diesel out the exhaust and it no longer does the bubble thing. Thanks
replaced it with a thermostat from ford. Just wondering how much damage could have happened and if I should start working on the parts truck instead. Theres no water in the oil, only the smell of diesel out the exhaust and it no longer does the bubble thing. Thanks
Cargo Master
Joined: Feb 2008
Posts: 3,409
Likes: 1
From: back in SE Iowa
tear the top of the motor apart and replace the gaskets.or you could pull the thermostat anr run some bars head gasket sealer stuff through it and hope it works.but if its bubbling out like you said the manifold gasket is gone.you can also maybe try re-torqueing the manifold?
Post Fiend
Joined: Nov 2004
Posts: 5,638
Likes: 1
From: Manitoba
There are head coolant passages that dead end at the valley pan/intake manifold.......on the 7.3 they are plugged with frost plugs...... some 6.9s i have seen were not and the valley pan gasket was the seal.
If there is no coolant in the engine oil that is a plus..... have you had the oil tested by Blackstone labs....... eyeballing oil does not give you a true indicator.
If there is no coolant in the engine oil that is a plus..... have you had the oil tested by Blackstone labs....... eyeballing oil does not give you a true indicator.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
The sealing surface of the intake manifold/valley pan is just metal with a few ridges pressed into it.
And that makes it the weakest point for sealing the coolant pressure in the engine.
In stock NA form, the only pressure on that point is the 14 PSI cooling system pressure which is why it gave me so much greif when I cranked the boost up over 20 PSI.
A couple coats of Copper High Heat gasket maker and some stronger studs to bolt the intake down at a higher torque setting eliminated that problem.
And that makes it the weakest point for sealing the coolant pressure in the engine.
In stock NA form, the only pressure on that point is the 14 PSI cooling system pressure which is why it gave me so much greif when I cranked the boost up over 20 PSI.
A couple coats of Copper High Heat gasket maker and some stronger studs to bolt the intake down at a higher torque setting eliminated that problem.
