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Bad cylinder
It turns out that the fouled plug I mentioned last week is oil
fouled... I suspect that the rings have gone... I will borescope the cylinder for damage and check the seal on the intake valve stem, but I suspect the worst... It is burning a quart every 1.5 hours, suddenly... And the story gets complicated... The engine is roughly 1500 smoh... The cylinders are old reruns... The case/crank is ~ 1958 manufacture with nearly 6000 hours in the log book... It is unlikely that Lycoming would take it for core credit... So the options are (in decreasing cost): Factory New (How much? I see, umm, let me get back to you on that.) Factory rebuild - unlikely to get core credit, so total cost about $25k + labor Field overhaul (my mechanic refuses to OH engines anymore so I will have to ship) ~$9K base cost plus parts that won't make it - I'm guessing $15K + If I remove the engine I will have the mount overhauled, new hoses, etc... TOH with 4 new Titan cylinders - ~$4K plus Shipping and Labor 1 new Titan cylinder - ~$1K plus S&L Overhaul the cylinder - maybe $500 total... Overhauling one cylinder gets you into RCR ( russian cylinder roulette)... Both the mechanic and I agree this is not the best route, but it is the cheapest initially... He wants a factory reman to hang, of course... The issue with changing out one cylinder is if one cylinder is gone at 1500 hours, how long before the next one, etc... Doing a TOH at 1500 hours doesn't initially seem cost effective, but it is where I am leaning... The bottoms on 320 150HP engines will, in my experience, go lots longer than the 2000 hour recommended overhaul... If I can get another 1000 hours out of the bottom (2500 total), which is possible, both I and the airplane will likely be retired from flying for other reasons... decisions, decisions... daaayum... denny |
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