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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-03-2016
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T Stat 4.0 sohc

Can the t Stat be replaced as it sits on motor, does the upper intake need to come off,just want to know before I do it can easily get to all bolts ,thanks
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Old 01-03-2016
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Good how-to here, with pictures: How To Replace the Upper and Lower Thermostat Housing on a Ford 4.0L V6 SOHC Engine

Just as a heads up the original thermostat housings on these engines are "known" to start leaking.
And I do believe in the "if it ain't broken don't fix it", but if the labor on this project doesn't look like you want to do it again then I would see what the parts pricing is on replacing the housing.
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Old 01-03-2016
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T stat

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Originally Posted by RonD View Post
Good how-to here, with pictures: How To Replace the Upper and Lower Thermostat Housing on a Ford 4.0L V6 SOHC Engine

Just as a heads up the original thermostat housings on these engines are "known" to start leaking.
And I do believe in the "if it ain't broken don't fix it", but if the labor on this project doesn't look like you want to do it again then I would see what the parts pricing is on replacing the housing.
Thanks ron, the truck was just not warming up at all but now it's at normal temp in ten minutes or so,thanks, hope housing holds up
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Old 01-04-2016
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Thermostats are suppose to "fail safe", that means if it should fail then it would stay fully open.
"Suppose to" is the word to watch out for.
Thermostats use a wax like substance in the center rod, as it heats up it melts and becomes a liquid and that allows thermostat valve to open.
Since yours seems to have been stuck open for a bit that could mean it is failing, and they can fail closed..............so overheat engine.

Keep an eye on the temp gauge and PULL OVER if it starts to climb, DO NOT try to "make it home" or any where else.
Let it cool down, then check coolant level, if it isn't a leak, then start engine and drive until it starts to climb again, then pull over and let it cool off, repeat, until you get where you need to be.
If it takes you 3 hours then you are making $200 an hour minimum, because you WILL blow head gaskets if engine gets too hot, not maybe, WILL, and that will cost you $600, if 1 head cracks add $300
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Old 01-04-2016
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I replaced the entire thermostat and thermostat housing. If it is possible to replace the thermostat without removing the upper intake, I don't think the hassle would be worth it. I doubt it is even possible to do without removing the upper intake.
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Old 01-04-2016
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T stat

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Originally Posted by IN2 FX4 View Post
I replaced the entire thermostat and thermostat housing. If it is possible to replace the thermostat without removing the upper intake, I don't think the hassle would be worth it. I doubt it is even possible to do without removing the upper intake.
It took all of 15 minutes to change,temp runs a little more the a quarter of the way past the C mark right where it should be, thanks to all
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Old 01-04-2016
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Originally Posted by scott1469 View Post
It took all of 15 minutes to change,temp runs a little more the a quarter of the way past the C mark right where it should be, thanks to all
Good work

Thanks for the update
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Old 01-05-2016
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I didn't change just the thermostat because it was still working. I had a leak in the thermostat housing. I didn't think to check if only the thermostat could be removed easily. It is good to know it is not a difficult job. Just hope you don't end up with a leak. Replacing the complete thermostat housing is not a easy job.
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Old 01-05-2016
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Quote:
Originally Posted by IN2 FX4 View Post
I didn't change just the thermostat because it was still working. I had a leak in the thermostat housing. I didn't think to check if only the thermostat could be removed easily. It is good to know it is not a difficult job. Just hope you don't end up with a leak. Replacing the complete thermostat housing is not a easy job.
Replacing the housing isn't that bad at all.
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