Patterman Posted January 13, 2012 Report Posted January 13, 2012 Hi, Not every time but more often than not I get a pretty bad shimmying on rollout after an otherwise nice enough landing on my 64 C model. Has anyone experienced the likes of this? Thank you, Scott
jamesm Posted January 13, 2012 Report Posted January 13, 2012 It is possible the tire is out balance. When I had shimmy nose wheel on take off usually when I felt it is most, I replaced the nose tube and tire that solve my problem. Check the nose wheel bearing. It could be nose gear steering bushing . Hope this helps, James '67 M20C
lahso Posted January 13, 2012 Report Posted January 13, 2012 I have the same thing happening on my 1966 C, and it is the nose gear steering bushing. At annual I'm getting the LASAR oversize replacement.
lahso Posted January 14, 2012 Report Posted January 14, 2012 No problem, Jim. We just confirmed the solution!
Shadrach Posted January 14, 2012 Report Posted January 14, 2012 I had my truss bushing replaced last year as well but it did not shimmy... has anything been done to the gear lately? http://www.donmaxwell.com/publications/MAPA_TEXT/M20-202%20-%20Eight-Second%20Ride/EIGHT_SECOND_RIDE.HTM
Patterman Posted January 14, 2012 Author Report Posted January 14, 2012 Good morning Shadrack, Nothing has been done since I owned the plane (2007). Shortly after I bought the plane and in the four years since it happened a handful of times, but most landings are fine. The problem is that the last three landings have all been shakers, so it is time to do it right. I am looking at Lasar's site now since I have the advice you guys gave me. When I did the gear swing it seems like there is an aweful lot of play in the front gear so the advice seems sound, I just want to be sure because they seem proud of the parts. Thanks! Have a great day, Scott
Sven Posted January 20, 2012 Report Posted January 20, 2012 Scott, Be sure to check out this thread: http://www.mooneyspace.com/index.cfm?mainaction=posts&forumid=2&threadid=1773
gregwatts Posted January 20, 2012 Report Posted January 20, 2012 Quote: Patterman Good morning Shadrack, Nothing has been done since I owned the plane (2007). Shortly after I bought the plane and in the four years since it happened a handful of times, but most landings are fine. The problem is that the last three landings have all been shakers, so it is time to do it right. I am looking at Lasar's site now since I have the advice you guys gave me. When I did the gear swing it seems like there is an aweful lot of play in the front gear so the advice seems sound, I just want to be sure because they seem proud of the parts. Thanks! Have a great day, Scott
MooneyMitch Posted January 20, 2012 Report Posted January 20, 2012 Quote: gregwatts LASAR are good people.....I just replaced the steering horn in mine.....~$950 for the parts. Makes all the difference in the world. I have been a customer at LASAR for approx 15 years and never an issue.
Immelman Posted January 20, 2012 Report Posted January 20, 2012 While a worn steering horn may be the main culprit there are other areas of slop that add up in addition to whatever the steering horn has in it. Look at the connection between the rudder pedals and the steeing horn. As I recall you go through 4 (I think) separate rod-ends, each of which eventually wear and add to the slop. Lasar helped me on parts here as well. I've replaced 3 of them as well as with shims that can go on the end of the steering horn to slightly extend its service life. If you are going to pull things apart to do the horn, you may as well look at these rod ends as well. Comparitively they are inexpensive, maybe $20-$30 each and the incremental labor cost (or your time) won't be much. The worst part about them is dealing with a particularly hard to get to cotter...
jwilkins Posted January 20, 2012 Report Posted January 20, 2012 All the advice provided is good and lists many probable areas to check. 1. On my prior plane, a 67 F, the nose wheel was fine when I got the plane and slowly started showing an ocassional shimmy on roll out. I had the tire replaced and balanced, no difference. It got worse but teh nose gear assembly seemed tight to the AP. I was about ready to have the nose gear assembly R&R when I went to one of the MAPA Safety seminars. Bruce Jaeger (former owner of Wilmar) said the nose gear shimmy damper should be checked. You can see it above your nose gear. It's a horizontal rubber bushing. Mooney sells shims in a couple different thicknesses to shim the rubber bushing tight. My local AP shimmed the damper in less than an hour and the shimmy was fixed. Not trying to say this is your issue, but it is a good thing to check as it is easy to correct and made a dramatic instant 'fix' on my F. 2. re: Lasar: Good people. All aircraft parts are expensive. Lasar not only sells factory parts (usually at a discount), but they have an extensive inventory of used parts, and have over the years invested a huge amount of time and money into getting approvals to refurbish and improve a lot of our required parts. I always go to Dan (parts department) first whe I need any Mooney parts. Nothing in aviation is inexpensive, but it sure is nice to know we have companies like Lasar we can count on to help us keep these planes flying. Jim
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