Re: Crankcase damage
In my opinion, and due to past experience, you would be better off to use Gray Marine-Tex instead of JB Weld...... Gray meaning the color of the Marine-Tex which I find to be stronger (in my opinion) than the White Marine-Tex.
Marine-Tex can be drilled, tapped, etc.... great stuff. Shape and contour as good as possible when patching, then sand and file as needed.
At one time, just as an experiment and no charge, using masking tape as a backup material (can't patch a hole if nothing is in back of it), I patched a hole in a 225hp crankcase for a close friend with this Gray Marine-Tex, the widest portion of this hole being about 2.5" (big hole). Amazingly the crank on this engine was okay, and the parts needed that resulted in this hole was replaced with used parts I had laying around. I figured that the patch would probably last a few weeks at the most. I was to get the engine back to use for parts later so there was no compromise of expertise, reputation, etc..... just an experiment between friends.
Of course, the Marine-Tex was applied in layers
This experiment was back in 1990...... I wish that damn thing would blow up someday, I could use the parts!
