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Ok, I got a simple one. The 13B eng. oil pan mounts to the anodized alum. plate that mounts to the eng. block. I kept getting minor little oil leaks in multiple diff. locations (cleaning and sealing from the outside to correct). Started to look like a mess. Sealant used was Permatex Ultra Gray Silicone Sealer, originally for assem. Am now about to assem. a fresh 13B and am looking for a better way (no leaks). I do not want to cut a groove in alum. mount plate. How about take a tip from Lycoming guys and insert a silk thread around sealing areas ?
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