bultaco956(at)yahoo.com
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 Posted: Sun May 03, 2020 9:59 am Post subject: Yak-List Digest: 4 Msgs - 05/02/20 |
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Larry: I had a shimmy problem in my CJ that bugged me for quite some time. I had the CJ for almost 10 years before it cropped up. It started out as an occasional nuisance and one day it shook bad and did break the splined shaft. OH dampener but still a transient nuisance problem on takeoff and under braking. Over a period of time changed nose tire, balanced nose wheel, changed nose tire again and reversed direction of wheel - that finally fixed it. I believe my root cause was the tendency of the Desser tires to go out of round if left to sit for an extended time particularly if the tire becomes oil contaminated and/or low on pressure. I am more careful caring for my nose tire tire now. BTW there was no doubt the shaft broke the day it let go. Doug has the parts, I did source thin stainless washers elsewhere to shim scissors per PLA MM. Hope this helps.
Jay Wells
1985 CJ6A
On Sunday, May 3, 2020, 05:19:39 AM EDT, Yak-List Digest Server <yak-list(at)matronics.com> wrote:
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Yak-List Digest Archive
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Total Messages Posted Sat 05/02/20: 4
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Today's Message Index:
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1. 05:50 AM - Shimmy vibration? (motoadve)
2. 07:36 AM - Re: Shimmy vibration? (Larry Pine)
3. 10:55 AM - Re: Shimmy vibration? (doug sapp)
4. 03:40 PM - Re: Shimmy vibration? (motoadve)
________________________________ Message 1 _____________________________________
Time: 05:50:16 AM PST US
Subject: Shimmy vibration?
From: "motoadve" <larry(at)motoadventuring.com (larry(at)motoadventuring.com)>
It had happened twice, once landing on grass strip that transitions to pavement,
the nose wheel got back in the air a bit and when it touched down, got lots
of vibration, whole plane shaking.
Second time I did a landing and bounced, (short field and wanted to be down before
I should , had too much energy) when it touched down again lots of vibration,
whole plane shaking.
Both times I thought I had a flat tire.
Take offs , no vibration , and regular landings no vibration, seems to be the nose
wheel does not likes to come back up in the air because the second time it
touches down generates a lot of vibration.
Any ideas what causes this (apart from lousy landing ) 
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496160#496160
________________________________ Message 2 _____________________________________
Time: 07:36:04 AM PST US
From: Larry Pine <threein60(at)yahoo.com (threein60(at)yahoo.com)>
Subject: Re: Shimmy vibration?
Service shimmy dampener=C2-
Sent from Yahoo Mail for iPhone
On Saturday, May 2, 2020, 05:59, motoadve <larry(at)motoadventuring.com (larry(at)motoadventuring.com)> wrote
:
It had happened twice, once landing on grass strip that transitions to pave
ment, the nose wheel got back in the air a bit and when it touched down, go
t lots of vibration, whole plane shaking.
Second time I did a landing and bounced, (short field and wanted to be down
before I should , had too much energy) when it touched down again lots of
vibration, whole plane shaking.
Both times I thought I had a flat tire.
Take offs , no vibration , and regular landings no vibration, seems to be t
he nose wheel does not likes to come back up in the air because the second
time it touches down generates a lot of vibration.
Any ideas what causes this (apart from lousy landing )
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496160#496160
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
________________________________ Message 3 _____________________________________
Time: 10:55:27 AM PST US
From: doug sapp <dougsappllc(at)gmail.com (dougsappllc(at)gmail.com)>
Subject: Re: Shimmy vibration?
Could be several things:
Linkage worn
Scissors worn
Splined shaft (in damper) sheared
Damper needs overhauled
My guess is that the splined shaft is sheared. I have o/h kits and new
splined shafts if you discover you need them.
Best,
Doug
On Sat, May 2, 2020 at 5:53 AM motoadve <larry(at)motoadventuring.com (larry(at)motoadventuring.com)> wrote:
| Quote: | It had happened twice, once landing on grass strip that transitions to
|
| Quote: | pavement, the nose wheel got back in the air a bit and when it touched
|
| Quote: | down, got lots of vibration, whole plane shaking.
|
| Quote: | Second time I did a landing and bounced, (short field and wanted to be
|
| Quote: | down before I should , had too much energy) when it touched down again lots
|
| Quote: | of vibration, whole plane shaking.
|
| Quote: | Both times I thought I had a flat tire.
|
| Quote: | Take offs , no vibration , and regular landings no vibration, seems to be
|
| Quote: | the nose wheel does not likes to come back up in the air because the second
|
| Quote: | time it touches down generates a lot of vibration.
|
| Quote: | Any ideas what causes this (apart from lousy landing )
|
| Quote: | Read this topic online here:
|
________________________________ Message 4 _____________________________________
Time: 03:40:07 PM PST US
Subject: Re: Shimmy vibration?
From: "motoadve" <larry(at)motoadventuring.com (larry(at)motoadventuring.com)>
Thanks Doug, good to hear from you, will keep you posted.
--------
www.Backcountry182.com
Cessna 182 P
CJ -6
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=496166#496166
_/Navigator?Yak-List" rel="nofollow" target="_blank">http://www.matronic= - MATRONICS WEB FORUMS= --> http://forums.matronics.com
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