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I just recently replaced my intake manifold on my 91 Pickup 22re, and I did everything as you are suppose to, took it all apart, put a gasket on, and put it all back together like normal. But... Now it leaks coolant everywhere. Not everywhere, out of the thermo housing specifically. Every couple days I have to refill my reservoir because it is nearly empty. I have some quick seal on it, but that appears to have only slowed down the leak. What can I do.
For the thermostat housing I use the molded O-ring around the thermostat AND a thin layer of Permatex Ultra Gray RTV on the mating surface. Make sure both surfaces are clean and dry before applying silicone otherwise it won't bond.
To the other guy, probably best to create your own thread and give a lot more detail. Search too, it's a common topic.
Thermostat housing? Thermal Vacuum Valve? I assume the former. I have found it pretty easy to distort the rubber "o-ring" (it isn't actually an o-ring; it has a slot in the ring for the edge of the thermostat) when putting it back together. If it gets caught, it will leak, and usually damage the ring. Get a new ring, take it apart, and be happy with the repair.
Originally Posted by arlindsay1992
... AND a thin layer of Permatex Ultra Gray RTV on the mating surface. ....
The "o-ring" is the factory solution, which should last the life of the thermostat (generally, a very, very long time). You shouldn't ever need any sort of RTV or sealant (unless the recess for the o-ring is really damaged).
I agree the molded O-ring should be enough on a clean surface but there is often pitting on the surfaces of the intake manifold or the thermostat housing. That's what I use the RTV for.
I have been fortunate enough that the rubber seal around the thermostat seals it up just fine for me. Issues I had in the past were the bolts just not able to put enough clamping force on the housing. Usually a PO had to long of a bolt in the housing. Got to watch your torque as it can snap a bolt in the housing.
Stop Leak makes a mess inside the engine. I can not tell where your leak actually is but I would consider sealant or a paper gasket for the thermostat or thread sealer if it is for the senor on the threads.
10-28-2015, 08:06 PM
