I have the silicone gaskets on my IO-390 and thought I could, after a while get them all to stop weeping. I have three cylinders dry but one is getting the best of me. I remove them, clean with a dampened cloth with brake cleaner and let dry. Clean and dry both the head and cover and reinstall. The weeping seems to occur around the bottom bolts and probably the center bottom one , with the longer bolt for the Adel clamp to secure the Ign. leads. This last time I added high temp. silicone around the center bolt, but it appears to still be weeping. I don't feel I'm over tightening the bolts, I was torqueing them to specs. , but I've been trying to fix them with the lower cowl on lately and doing them by hand, maybe that's the problem but I highly doubt it.
Any recommendations would be appreciated.
Any recommendations would be appreciated.