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Dan Thomas wrote:
The Type Certificate Data Sheets will give minimum and maximum static full-throttle RPMs for that engine/prop combination in that airplane, and if there is valve train wear the RPM will be out of the range. This isn't rocket science. If the crank is eating its way into something, there'll be metal in the filter. That's simple enough, too. If the oil pressure is well into the green, and doesn't drop to zero at idle when hot, the bearings are OK. If the compressions are as high as he's indicated, there isn't much wrong with the top end of the engine, other than perhaps corroded valve stems. Lycomings have been known to swallow valves when the head broke off the stem because of corrosion pitting in engines that have been run for short periods and left to sit. Similarly, the crankshafts in these engines build up water/oil sludge in the crank nose (unless it's driving a constant-speed prop) and this causes dangerous corrosion that can result in propeller departure. Lycomings run regularly on long flights have reached 4000 hours without overhauls. Tell me what airplane it's in and I'll look up the prop RPM range for you. Thanks for answering Dan, It makes more sense what you say about metal in the oil, as I was going to post how would I know what is happening "below the top" without an overhaul. The engine is in a BE 23 (Beech Sundowner). I bought the plane for $38,000 knowing a major overhaul is in my short future, but wanted to get my learning curve behind me in this engine before overhualing it. Right now, I get the oil changed every 30 hours, and the A&P checks for metal every change. I plan to have the compression checked every other oil change. I fly it a minumum of one hour a week (even if just around the patch) weather permitting. (I have been averaging 6 hours a week). Once I get my instrument rating (I am starting ground school next week), I plan to fly much more a week, as my job takes me throughout the state of MS. Any other tips on maintaining this engine and airplane (or what to look for) is surely appreciated. I have not seen any FAQ's on this subject, and I am learning more from this group and hangar talk. Allen |
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