Posted by Lebby on March 02, 2014 at 11:50:52 from (71.82.165.19):
First post here so please bare with me...
We have a 70"s IH 674 gas that has a problem of leaking coolant. Site of the leak is where the water manifold and the water pump come together to act as what appears to be a water passage to bypass the thermostat. When we replaced the expired head gasket, during disassembly, we noticed clear silicone (alot of it) had been shot into and around this area to help with the rubber "grommet" that is used to butt these two pieces together. Obviously it had been leaking for the previous owner.
We used a new head gasket set which included the new "grommet" which we used. All surfaces were clean and true.
After reassembly, when checking the coolant level between uses the level would drop. Site of the leak is/was at this point where the two pieces mate.
What appears to be happening is, during use at operating temp, the surfaces expand and sealing is accomplished. However when the tractor is shut off and cools down things must contract and at that point allow the coolant to escape allowing a low level in the cooling system.
At this point in time, I am considering a couple of things. In hind sight maybe we should of applied some silicone sealant on the grommet when we put this back together. The other thing under considerstion would be block the existing passage holes and relocate and drill two new holes, insert a couple of pipe nipples and use a length of hose to complete this passage.
I"m not the worlds greatest mechanic but I would rate this design as an engineer"s dream gone bad.
Wondering if any one else has experienced this same dilema and if you did... How did you deal with it?
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