2001 SOHC Thermostat Housing Dilemma.... Need opinions/advice - Ranger-Forums - The Ultimate Ford Ranger Resource


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

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Old 10-24-2012
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2001 SOHC Thermostat Housing Dilemma.... Need opinions/advice

Hello all, first let's start with what happened...

Thermostat housing cracked/leaking so I decided to replace it. Upon removal of the three bolts that hold the housing to the block (is it the block or lower intake) one of the bolts snapped off. I attempted to drill, heat, freeze, just about every type of trick you could to get it out, I ended up taking it to a machine shop that upon second thought was a horrible idea. (Just very lackluster service and workmanship).

At this shop they drilled out the bolt and helicoiled it and gave me a new bolt. I know this knew bolt is standard compared to the metric size it used to be.

6 months later I am still leaking coolant, at first it was the thermostat gasket, then a radiator hose, now that everything is pretty much settled I'm still using coolant. Not enough to have a drip but enough to smell it when the engine gets warmed up.

I was at a loss.

So I added some UV dye to the coolant and after a few minutes of letting it run I found the leak! It looks like the seal I used from housing to block was giving way, so I used the seal in addition to some gray rtv and it did the trick. But now somehow the coolant is leaking up through the bolt I think. The system pressurizes the hoses and if I squeeze the hoses I can't see any running coolant. Weird.

I'm at a complete loss at what to do from this point. Do I let it ride and just fill it up with water? Do I switch out the engine so I have a proper torqued bolt with correct size?

What would you do?
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Old 10-24-2012
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Join Date: Oct 2010
Location: Kailua, Hawaii
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The 4.0L OHV and SOHC engines are known for lower thermostat housing failures.
They usually split seams, or the older style housing leaks from it's threaded sensors.
If you are unsure, rent a coolant pressure test kit with a fully refundable deposit. GL

http://bengrosser.com/howto/fordthermostat/

Last edited by swshawaii; 10-24-2012 at 09:52 PM.
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