[KTL]

Ingo,

I understand your pain but do you really need to replace the crank? Reason I ask is on account of what modifications i've seen to other cranks. My SC 70.4mm crank was cross-drilled by Marine crank. When David did the work, they also chose to remove all the plugs and replace them with set screws by tapping the plug holes. What I also found is he tapped the nose of the crank and the flywheel flange (in the dowel pin hole) with set screws as well. So it would appear that you could tap the snout of your crank to restore that location? I think Marine does this because it makes for easier cleaning by having the ends open to flush stuff out.

While you have it out, I would have the crank checked and if all is in order it wouldn't cost a bunch of money to have it cross drilled. Not saying it's a must-do. Just an increased oiling benefit to rod journals #2 and #5 since their oil supply comes from the ends of the crank.

Cross-drilling #2 and #5 and feeding them via the #4 main bearing location (you have to either groove the #4 bearing or the #4 main journal and enlarge the feed holes to ensure a path of lesser resistance into the crank here) provides a more direct path to those rods. In other words under normal circumstances #2 and #5 rods are the last to get oil & the cross-drill provides a more direct path.

Good luck with the fix.