EricJ Posted April 19, 2024 Report Posted April 19, 2024 4 hours ago, Yetti said: I am not saying that MMO will help you make a stuck valve get to annual, but if you think about it the engine design and MMO are of the same vintage. MMO dates back to 1923 as a carburetor cleaner/flush. Word is that radial engine maintenance outfits in WWII got it by the barrel, and used it up regularly. It's been a regular component in aviation maintenance for nearly 100 years. Not even remotely a new or untested thing. Quote
carusoam Posted April 20, 2024 Report Posted April 20, 2024 How would one know… The oil ring is a bit gummy? Then… How would one know… The oil ring has been cleaned? Sounds like… Oil may be showing up in the lower spark plug? A sign that the oil ring isn’t doing its job… could be a cylinder surface quality issue as well… If sending a camera down the cylinder is possible… be on the lookout for polished surfaces where they used to be cross hatchings. +1 for selecting a solvent mix that is good at dissolving carbon… PP questions only, not a mechanic… Best regards, -a- Quote
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