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CJ6 Shimmy damper problems

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CJ6XXK

Joined: 27 Jan 2011
Posts: 21
Location: Australia

Posted: Sat Mar 26, 2011 7:35 pm Post subject: CJ6 Shimmy damper problems

I just done some high speed taxi runs in my cj6 today and have a few problems.



First thing is that i raise the the nose of the plane then put it down again and i have got massive amounts of shimmy.

This was a brand new shimmy damper i bought and fitted as well.

Is there a special way to set them up?



Thanks Daniel

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dsavarese0812(at)bellsout
Guest

Posted: Sun Mar 27, 2011 6:50 pm Post subject: CJ6 Shimmy damper problems

You may also have an out of balance nose wheel tire and wheel.  Very 

common problem.

Dennis



On 3/26/2011 10:35 PM, CJ6XXK wrote:

 	  Quote: 	
		   



 I just done some high speed taxi runs in my cj6 today and have a few problems.



 First thing is that i raise the the nose of the plane then put it down again and i have got massive amounts of shimmy.

 This was a brand new shimmy damper i bought and fitted as well.

 Is there a special way to set them up?



 Thanks Daniel





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=335149#335149

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cjpilot710(at)aol.com
Guest

Posted: Sun Mar 27, 2011 8:39 pm Post subject: CJ6 Shimmy damper problems

Not only out of balance but if the scissors is loose at all you'll get  the same thing.  There can not be any play in the bolts that are part  of the scissor assembly. 

 Jim "Pappy" Goolsby

  

  In a message dated 3/27/2011 10:51:58 P.M. Eastern Daylight Time,  dsavarese0812(at)bellsouth.net writes:

  	  Quote: 	
		  -->    Yak-List message posted by: "A. Dennis Savarese"    <dsavarese0812(at)bellsouth.net>



You may also have an out of balance    nose wheel tire and wheel.  Very 

common problem.

Dennis



On    3/26/2011 10:35 PM, CJ6XXK wrote:

 	  Quote: 	
		   -->  Yak-List message posted    by: "CJ6XXK"<Danielt_355(at)hotmail.com>



 I just done some    high speed taxi runs in my cj6 today and have a few problems.



    First thing is that i raise the the nose of the plane then put it down again    and i have got massive amounts of shimmy.

 This was a brand new shimmy    damper i bought and fitted as well.

 Is there a special way to set them    up?



 Thanks Daniel





 Read    this topic online here:



    http://forums.matronics.com/viewtopic.php?p=335149#335149





&gt========================e  ties  Day  ================================================               - MATRONICS WEB FORUMS  ================================================             - List Contribution Web Site  sp;                             ===================================================
	




	


  [quote][b]

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dsavarese0812(at)bellsout
Guest

Posted: Mon Mar 28, 2011 4:01 am Post subject: CJ6 Shimmy damper problems

Very true Pappy.  He should jack the nose up and try to move the nose 

wheel assembly side to side and fore and aft to see if there is any play 

in the bushings and bolts.

Dennis



On 3/27/2011 11:10 PM, cjpilot710(at)aol.com wrote:

 	  Quote: 	
		   Not only out of balance but if the scissors is loose at all you'll get

 the same thing. There can not be any play in the bolts that are part of

 the scissor assembly.

 Jim "Pappy" Goolsby

 In a message dated 3/27/2011 10:51:58 P.M. Eastern Daylight Time,

 dsavarese0812(at)bellsouth.net writes:



     

     <dsavarese0812(at)bellsouth.net>



     You may also have an out of balance nose wheel tire and wheel. Very

     common problem.

     Dennis



     On 3/26/2011 10:35 PM, CJ6XXK wrote:

      > 

      >

      > I just done some high speed taxi runs in my cj6 today and have a

     few problems.

      >

      > First thing is that i raise the the nose of the plane then put it

     down again and i have got massive amounts of shimmy.

      > This was a brand new shimmy damper i bought and fitted as well.

      > Is there a special way to set them up?

      >

      > Thanks Daniel

      >

      >

      >

      >

      > Read this topic online here:

      >

      > http://forums.matronics.com/viewtopic.php?p=335149#335149

      >

      >

      >

      >

      >

      >

      >

      >

      >

      >

      >========================e ties Day

     ================================================ - MATRONICS WEB

     FORUMS ================================================ - List

     Contribution Web Site sp;

     ===================================================



 *

 *

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Noplugs

Joined: 27 Aug 2009
Posts: 35
Location: Houston, TX

Posted: Mon Mar 28, 2011 9:51 am Post subject: Re: CJ6 Shimmy damper problems

A friend of mine had the same problem on his CJ after he installed a US wheel and tire mod. His first thought was the new mod was the problem and looked at everything that the mod would cause the shimmy. Well to make the long story short I told him to look at the shimmy dampener. He was skeptical because how could it go bad in one flight. Well he took off the dampener, opened it up and found the oil watery and dirty (His words to describe a light weight oil) and it was not full of oil. He cleaned and re-serviced the unit reinstalled it and the shimmy was gone. So my advice is to look at dampener, it does all the work so it would be the weakest link in this issue.

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barryhancock

Joined: 09 Oct 2008
Posts: 285

Posted: Sat Apr 09, 2011 8:55 am Post subject: Re: CJ6 Shimmy damper problems

Guys, a common culprit of nose wheel shimmy on the CJ is improper pressure in the nose wheel strut.  Check to make sure you have proper pressure there (I'm on the road and don't recall the number).  But a 200 lb. guy hanging from the prop should be able to deflect the strut about 2-3"....

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_________________
Barry Hancock
Worldwide Warbirds, Inc.
www.worldwidewarbirds.com

Vic

Joined: 12 Aug 2008
Posts: 115
Location: Southern Bavaria

Posted: Sat Apr 09, 2011 4:42 pm Post subject: Re: CJ6 Shimmy damper problems

Hello,



the shimmy damper is only fighting the real problem. That is considerable unbalance and run out of the rim. You can not fix run out after manufacture of the wheel. But you can do a lot more to balance the wheels by adding lead weights to the rims. With the main wheels you can put stick-on weights inside the rim - see photo. With the nose wheel there is less scope for that. But I would pour lead into the cavity opposite the valve, let it cool, then take it out, clean and degrease the weight and rim cavity and glue it in with silicone. The unbalance is mainly caused by the valve and rubber block of the inner tube. In fact this can be more than 150 grams/ 5 ounces. You would definitely not accept that on your car.



Cheers

Vic

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