Quote:
Originally Posted by Russianblue
Correct. It's got to be one of those things. Unfortunately, those are all deal breakers save the head bolt torquing which is PRETTY much a deal breaker. i do have a spare set of head bolts but i have used 98% of my allotted time for this project.
is it possible there is on obstruction in the system somewhere? Namely, the expansion tank? could that cause these symptoms?
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I'm usually the last guy to say something is not possible, but ... a simple blockage would not cause the suction without other things happening.
The air from the expansion tank air gap must be escaping while the engine is running. So if not from an expansion tank cap overflow, or an external leak, it must be an internal engine leak, which fits your other symptoms. But as I said in the earlier post an external leak that you can't see right now could be it.
I read your earlier posts about the destroyed water pump. So if there is a blockage or continued pump failure (but no other problems) that causes overheating, that would lead to a rise in temperature, which would also raise the coolant pressure. When that reached 2 bar (about 30 psi), the expansion tank cap would vent the excess pressure, letting liquid coolant, water vapor, and AIR out of the cap. Then the loss of air would lead to the suction thing when it cools down. Since you do not see the cap venting, it is very unlikely or impossible that a cooling system blockage is causing the suction.
BTW, I was way over 300% on allotted time when I finished mine.