Metengr, it was stored for three years straight, never used, never subjected to any moisture, never subjected to any temperatures below about 55F or above 90F... of this I am sure. The manifold casting was dry both before and after the storage period.
And, yes, there was cracking as the...
Thanks to all for your input. I realize that my actions in cleaning up the old cast iron accelerated the corrosion. What I am having trouble understanding is why the corrosion erupted at such a rate in a completely dry environment. A minimum of 1/4 inch of solid metal gone completely to rust...
Just a couple of poor quality photos. Sorry we didn't take any shots before pealing away the rust. The corrosion took place on the underside of the manifold/water jacket, where the water would naturally pool. My assumption is that hot salt water could suffuse somehow over the years into the...
Help me to understand something outside my area of expertise (computers)... I have a boat with two marine diesel engines both of which have had decades of seawater cooling. Three years ago we disassembled, sandblasted and painted one of the water cooled cast iron exhaust manifolds (after...
