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Cylinder rust stains

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Brock69

Member
I have been looking for a used 318 engine block.

I have found one but it had rust in some of the cylinders. I removed the rust and honed the cylinders. The cylinder walls are smooth. but there is a stain where the rust was.

Any thoughts on where or not this block is ok to use or is it junk.


Thanks
 
What you describe as a stain could be pitting or degraded metal below the surfaced rust that honing removed. More important than the appearance is measuring the bore tolerances.

Whenever you’re down to a bare block (especially a used one that you might not know the history of), it’s really the right time to get it hot-tanked and, possibly, bored-over. I know that means paying a machine shop and, potentially, shelling out for new pistons, but the last thing you want to do is rebuild an engine from the crank up and install it in the boat only to have cylinder-related issues......because that's a long way to backpeddle.
 
Scrap it! I had a Caddy V-8 with a few pinholes in the liner caused by rust. That SOB killed every mosquito in the neighborhood!

Jeff
 
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