On your recently overhauled 0-200 (80 or so hours on it), what you are experiencing is probably a stuck open exhaust valve. It sticks slightly open and you discover it after shut down because you have low or no compression on that cylinder. I experience stuck valves on mine too. It is a low time C-85. With the switch off, if you pull it through four or five blades, one cylinder has no compression because of the stuck open exhaust valve. The valve guides are new and the tolerance is close causing any carbon or other impurity to stick the valve. An oil change may help it one is needed.
There is much discussion here recently regarding Marvel Mystery Oil. If you read the can, it contains petroleum distillates (solvent) which "may" help if you use a little Marvel Mystery Oil in the crankcase. Not too much since it is a solvent. Some use it in their fuel which is probably less useful or ineffective and only serves to lower the octane of the gasoline (which really doesn't matter in the little Continentals). Since 100LL contains 4 ml more lead per gallon than the old 80/87 that our engines used to thrive on, you may be experiencing stuck valves because of the extra lead. If so, you can try TCP added to your 100LL. TCP is expensive and there are health warnings on the can. Available at overhaul time, are what they call "100LL exhaust valves" which have a 30 degree seat (mine doesn't have them). I have experienced stuck valves even though I use mostly unleaded auto gas so I do not think my problem is attributable to too much lead. If your is however, you may dilute your 100LL with unleaded auto gas to effectively lower the millilitres per gallon of lead content to be more like the old 80/87 fuel. (If you have an auto fuel STC). Lastly, when mine are stuck, sometimes it clears up with a warm up and running. You can really tell when you have a stuck valve with the engine running and it is obvious when it clears up. When you shut down and all cools off, it may stick again. Severely stuck valves, ones which will not free up with running, require a mechanic's intervention. Mine has a couple of times. Often you can "spike" the valve or free it after removing your rocker cover but if that doesn't work, there are some short cuts to unsticking a chronically stuck valve and one is the "rope trick." Good luck with yours. Grover 99398 ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]
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