N9656G Posted March 4, 2022 Report Posted March 4, 2022 So I believe my left side panel on my M20J is sagging about 1/4 inch lower then it should be. This is likely caused by worn “rubber screws?” That reduce pannel vibration? I remember reading these need to be replaced every 10 years or so. With glare shield likely coming off at annual for refurb, has anyone ever replaced these “screws” ? Whats the real name of these “screws”? Where do I buy them? What to expect in labor for replacement?
carusoam Posted March 4, 2022 Report Posted March 4, 2022 Panel isolators… Vibration absorbers… Instrument Panel mounts… Shock mounts… Zip on over to Aircraft Spruce and see what they call them… They are amazingly low cost devices… Don’t forget the acorn nuts…. Something like this? https://www.aircraftspruce.com/catalog/inpages/shockmounts3.php PP thoughts only, -a-
N9656G Posted March 4, 2022 Author Report Posted March 4, 2022 YOU MAD MAN YOU FOUND THEM! Thank you so much @carusoam 1
201Steve Posted March 4, 2022 Report Posted March 4, 2022 Keep in mind, there are two sizes back there. Word on the street is, the ones available through McMaster Carr are better quality. also keep in mind, stud LENGTH is critical for a tight fit. There is only so much travel for the acorn nut. If stud is too long, the acorn nut tightens against its own head before pulling the panel tight. I have seen them Jimmy rigged with multiple washers or extra nuts but I don’t believe that’s correct… 1
0TreeLemur Posted March 4, 2022 Report Posted March 4, 2022 1 hour ago, N9656G said: YOU MAD MAN YOU FOUND THEM! Thank you so much @carusoam -a- is the all knowing Dean of Mooneyspace... 1
larrynimmo Posted March 4, 2022 Report Posted March 4, 2022 I have the same issue, but I looked at it years ago, and there are a few “U” standoffs that actually give you that critical alignment. I think if you were to remove the “U” standoffs and resend them you could correct the alignment
Guest Posted March 4, 2022 Report Posted March 4, 2022 They usually have two different lengths of studs. The longer screws into the panel sub structure, the shorter passes through the instrument panel. The “U” shaped part is for panel grounding. Clarence
1980Mooney Posted March 5, 2022 Report Posted March 5, 2022 On 3/3/2022 at 7:35 PM, N9656G said: So I believe my left side panel on my M20J is sagging about 1/4 inch lower then it should be. This is likely caused by worn “rubber screws?” That reduce pannel vibration? I remember reading these need to be replaced every 10 years or so. With glare shield likely coming off at annual for refurb, has anyone ever replaced these “screws” ? Whats the real name of these “screws”? Where do I buy them? What to expect in labor for replacement? On 3/3/2022 at 10:08 PM, 201Steve said: Keep in mind, there are two sizes back there. Word on the street is, the ones available through McMaster Carr are better quality. also keep in mind, stud LENGTH is critical for a tight fit. There is only so much travel for the acorn nut. If stud is too long, the acorn nut tightens against its own head before pulling the panel tight. I have seen them Jimmy rigged with multiple washers or extra nuts but I don’t believe that’s correct… 17 hours ago, M20Doc said: They usually have two different lengths of studs. The longer screws into the panel sub structure, the shorter passes through the instrument panel. The “U” shaped part is for panel grounding. Clarence Exactly The original shock mounts are made by Lord and about $18 each - brass/nonmagnetic studs I assume specified for the days of magnetic instruments. Lord J-6984-64 Instrument Panel Shock-Mount at SkyGeek.com The shaft going through the instrument panel is shorter. The ones referenced in Aircraft Spruce in are J-6984-1. They are 1/8 inch too long. (the same length stud on each side) Overview Lord round instrument panel shock mount, as used in Cessna aircraft. Overall length 1-1/4". Rubber molded on 8-32 threaded projections. New manufacture. There is a remedy - you can cut 1/8 inch off one side on each mount. Aircraft Spruce also has some cheap ones with ferrous studs. Looks like you may be a new "J" owner. You might want to look at this: Page 614 (56-10-06, page 0) mooney.free.fr/Manuels M20J/M20J/Mooney M20J Illustrated Parts Catalog.pdf Also mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 1 of 2.pdf http://mooney.free.fr/Manuels M20J/M20J/Mooney Service Manuel M20J Vol. 2 of 2.pdf 1
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