Stephen Posted March 2, 2020 Report Posted March 2, 2020 Hi guys, After running my aircraft to leak check post oil-change (cowling was off), I saw this on the ramp under the nose area after shutting down. Have no idea if it was from my Mooney; couldn't locate a missing bolt, but wanted to see if you guys recognized the type bolt and have any clues where to look. It is *highly* worn but had no corrosion so I believe if it was out there on the ramp it wasn't long and it wasn't in a high-traffic area of the ramp. Quote
Andy95W Posted March 2, 2020 Report Posted March 2, 2020 (edited) That looks a lot like the bolt that goes through the slotted bracket that holds the alternator on at the proper tension. That explains the mashed down threads and the safety wire hole in the head of the bolt. Yours should be readily visible at the top mount of your alternator, between the alternator and the engine case, right about where the alternator belt runs. Edited March 2, 2020 by Andy95W 3 Quote
Hank Posted March 2, 2020 Report Posted March 2, 2020 (edited) 21 minutes ago, Andy95W said: That looks a lot like the bolt that goes through the slotted bracket that holds the alternator on at the proper tension. That explains the mashed down threads and the safety wire hole in the head of the bolt. Yours should be readily visible at the top mount of your alternator, between the alternator and the engine case, right about where the alternator belt runs. That was my first thought, too. I once found one in the bottom of my cowl . . . . Now I confirm security of the alternator by grabbing and wiggling it during preflight. May be alternator or starter, they're both up front. Edited March 2, 2020 by Hank Quote
Yetti Posted March 2, 2020 Report Posted March 2, 2020 2 hours ago, Aerodon said: or a starter mounting bolt? Don't have drilled heads. Looks too long and too small for alternator adjustment arm.bolt. but something to check. Quote
N201MKTurbo Posted March 2, 2020 Report Posted March 2, 2020 Looks like somebody forgot the lock wire. Quote
Stephen Posted March 3, 2020 Author Report Posted March 3, 2020 7 hours ago, N201MKTurbo said: Looks like somebody forgot the lock wire. Yes that is correct; last MX missed it. It was the alternator slide adjustment bolt (thanks @Andy95W and @Hank) and was not safetied. It is not installed and safetied 1 Quote
Guest Posted March 3, 2020 Report Posted March 3, 2020 The threads are quite worn, time for a new bolt. Quote
markgrue Posted March 3, 2020 Report Posted March 3, 2020 Looks too small for alternator or starter. Perhaps intake tube? Mark Quote
Stephen Posted March 3, 2020 Author Report Posted March 3, 2020 13 hours ago, M20Doc said: The threads are quit worn, time for a new bolt. @M20Doc, Thanks and absolutely agreed; already ordered 2. Looks like the PN for #12 in the illustration also has no shank and is threaded where it passes through the adjustment bracket. Seems like LYC would want a shank there... :: shrug:: Quote
Guest Posted March 3, 2020 Report Posted March 3, 2020 2 hours ago, Stephen said: @M20Doc, Thanks and absolutely agreed; already ordered 2. Looks like the PN for #12 in the illustration also has no shank and is threaded where it passes through the adjustment bracket. Seems like LYC would want a shank there... :: shrug:: There are AN coarse threaded bolts with a smooth shank that would work in this application as well. Clarence Quote
wcb Posted March 5, 2020 Report Posted March 5, 2020 On 3/2/2020 at 9:20 AM, Stephen said: Hi guys, After running my aircraft to leak check post oil-change (cowling was off), I saw this on the ramp under the nose area after shutting down. Have no idea if it was from my Mooney; couldn't locate a missing bolt, but wanted to see if you guys recognized the type bolt and have any clues where to look. It is *highly* worn but had no corrosion so I believe if it was out there on the ramp it wasn't long and it wasn't in a high-traffic area of the ramp. Are you sure you were having a bolt issue. I think you were just selling a book! Quote
Stephen Posted March 5, 2020 Author Report Posted March 5, 2020 No, book not for sale. Was a Christmas gift from my daughter. 1 1 Quote
carusoam Posted March 6, 2020 Report Posted March 6, 2020 @Stephen, About those bolts... Are they supposed to be a threadless shoulder where the threads on the old bolt got malformed? I think Clarence May have suggested it above... They May be the right bolt for the application, but there may be something better...? The threads may have a cutting effect in the bracket... until they get worked flat. PP thoughts only, not a mechanic... Best regards, -a- Quote
Stephen Posted March 6, 2020 Author Report Posted March 6, 2020 8 hours ago, carusoam said: @Stephen, About those bolts... Are they supposed to be a threadless shoulder where the threads on the old bolt got malformed? I think Clarence May have suggested it above... They May be the right bolt for the application, but there may be something better...? The threads may have a cutting effect in the bracket... until they get worked flat. PP thoughts only, not a mechanic... Best regards, -a- I agree, they would be better off with a shank vs all thread. Would need to measure the thickness of the bracket to get the requisite shoulder length. 1 Quote
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