Bummer. Glad you made another successful landing. You surely must be qualified for your glider rating by now.
FWIW, on an aircraft engine, any time you experience a broken crank, it's customary to have the case halves zyglo dye penetrant checked for cracks, then the case halves milled and the main and cam bearing saddles line bored. A crank failure almost always wallows or bends the bearing saddles, which may not be visible to the naked eye. The last one I dealt with had to have the crank bearing saddles welded and machined before line boring to make the case airworthy again. If it had been a current production engine, I would have recommended new case halves. With Corvair cases as as plentiful and inexpensive as they are, it's not a bad idea to replace the case after suffering a broken crank. I was wondering about the case when Mark had the last cam gear failure, but since my experience with Corvairs is virtually non-existent I didn't think my opinion would add any benefit over the Corvair experts available to the engine builders. BTW, cool tail art! -Jeff Scott Los Alamos, NM ---------- Original Message ---------- From: "Mark Jones" <flyk...@charter.net> To: "Corvair Net" <corvaircr...@mylist.net>, "KR Net" <kr...@mylist.net> Cc: Subject: KR> Another Bad Day for N886MJ List-Post: krnet@list.krnet.org Date: Fri, 28 Aug 2009 14:47:26 -0500 This past Wednesday, N886MJ experienced yet another engine failure resulting in another dead stick landing which turned out good since I was again able to glide safely back to the airport. The cam gear failed. I experienced the exact failure of the cam gear as I did Last November 1st. The only difference this time was that this one lasted 44 hours vs the 4.5 hour life of the first cam gear failure. Now for all you Corvair guys, don't go and get all hot and bothered about this as we suspect this is inherent to my engine only. Remember I had a crankshaft breakage just prior to the first cam gear failure which possibly could have damaged the case in a way that would allow the cam or crank to oscillate in an unnatural way that did not show up on tolerance checks.. We did replace the crankshaft, camshaft and both gears on both rebuilds. On this last rebuild everything was meticulously built, checked and rechecked. I will keep everyone informed to any findings as we tear down and rebuild. Mark Jones (N886MJ) ____________________________________________________________ Get an Unsecured Loan - Fast and Low Cost. Click here! http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTIqYu8NfWKcO5xMwMc5pPyLbc3co8nX7gAdZ67qdWedqgA91Jrj4M/
