Ahhhh, that didn't work. I let it set up overnight and when I got to work this morning it was still leaking. I took a good look and I don't see the timing cover cracked at all. I put lots of thread sealant on the threads and i siliconed the whole shaft liberally. what about oil residue in tye hole and on the bolt causing it not to seal? I am running synthetic oil. I can see it coming out the end of the hole underneith the bolt head. What about putting a copper washer there like on a brake calliper?