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Originally Posted by zonie77 I'll add a middle thread of prepping the heads and some other tips soon.
We got the engine in today but didn't finish hooking everything up.
I did find something verrrrrrrryyyyy interesting. I hadn't noticed it when we pulled the heads but the head gasket was rusting. I think this might explain why they are inconsistent. They still have some clamping force and the swelling of the gasket makes it act differently at times. Look at the rusty spots on the end cylinder.
This was the head side and we didn't check it originally, but as we were cleaning up I saw it. |
A sure sign that the corrosion inhibitors in the coolant failed at some point...i.e..the coolant was not changed and run so long that the corrosion inhibitors failed. That is very likely what eventually caused the hed gasket failure as the center core of the gasket rusted and collapsed. The center steel core of the gasket provides the resiliency to accept the thermal cyling loads as the engine expands and contracts. As the steel core of the gasket collapses due to corrosion it starts to leak.