cliffy Posted December 25, 2021 Report Posted December 25, 2021 Old Lycoming IO540 trick for leaking case halves Clean real well with acetone and use 5 min epoxy to cover the case seams. We stopped a lot of leaks that way 45 years ago when just retightening the bolts didn't work. Now, I just had a case leak at the top of my engine and retightened the bolts and the leak went away. If you are cleaning the engine and then flying hours before you try to find the leak you will never find it. Clean it good and run it on the ground, at most, once around the pattern. Uncowl the entire thing and find the leaks It ain't rocket science. If its leaking as much as you describe you will find it this way. 1
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