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lacloudchaser(at)yahoo.co
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 Posted: Sat Mar 15, 2008 2:44 am Post subject: Nose Wheel Shimmy |
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Folks,
My CJ has always experienced an excessive shimmy, serviced the dampner (piston/arm not broken), linkages tight, replaced the tire (showed uneven wear/left side heavy)...no fix
Wheel assembly out of balance? Any ideas/experiences/solutions/instructions with this problem? Where/how to balance check.
Thank you,
Chunks
You can also reach me at lacloudchaser(at)gmail.com (lacloudchaser(at)gmail.com)
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viperdoc(at)mindspring.co
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| Posted: Sat Mar 15, 2008 5:45 am Post subject: Nose Wheel Shimmy |
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Drew,
A real simple way to check if the tire is in balance is to strap the tail to a tie down with a come along (ratcheted tie down strap). Tighten down the strap enough to lift your nose wheel off the ground. Or if you have a jacks then simply jack the nose wheel off the ground to do this. Then first just look at the wheel up in the air. Does it automatically rotate to the heavy side down? Where does you valve stem stop? At the bottom? Or is there a particular part of the tire that appears to seek the lowest side of the circle, i.e. the bottom of the wheel with it up in the air? The heavier part of the tire assembly will seek the lowest side of the circle in response to gravity. Next spin the tire. Is there a smooth rotation? Does it wobble on the axle?
Now if it is simply a balance issue, you can pull it off and take it to most tire shops where they can apply a stick on wt under the lip of the rim to balance the tire. If not you may have to change the tire for a new one hoping they did a better job of molding it at Dessler.
If it wobbles when spun, then it may be a rim out of round or you could have a bad set of bearings. The next thing is to listen to the sound it makes when you spin it. That will give a clue as to the quality of your bearings and how well the last bearing grease packing was. If there is a grinding or ticking sound, you have a bigger issue than just a tire out of balance.
Hope this helps
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Drew
Sent: Saturday, March 15, 2008 5:41 AM
To: yak-list(at)matronics.com
Subject: Nose Wheel Shimmy
Folks,
My CJ has always experienced an excessive shimmy, serviced the dampner (piston/arm not broken), linkages tight, replaced the tire (showed uneven wear/left side heavy)...no fix
Wheel assembly out of balance? Any ideas/experiences/solutions/instructions with this problem? Where/how to balance check.
Thank you,
Chunks
You can also reach me at lacloudchaser(at)gmail.com (lacloudchaser(at)gmail.com)
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dougsappllc(at)gmail.com
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| Posted: Sat Mar 15, 2008 12:16 pm Post subject: Nose Wheel Shimmy |
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Drew,
"When stuff does not work properly go to the part you worked on last" Old saying by some far smarter than me, but it seems to help from time to time.
Remove the damper linkage leaving the arm on the damper. push the arm to the stop and pull it back to the mid point and stop. Next push it the opposite direction------the resistance should be instantaneous, without ANY "skip". If there is ANY skip or slack felt when you change direction it will cause shimmy to start, once started it will get out of control real fast. Things to do /check:
- Check damper as above
- Check linkage for slop
- Check nose gear scissors (top, bottom, and center) pivot points
- Have nose wheel tire balanced. Note that if you have a stock wheel and tire--the stock tires are sometimes very out of balance. If you have a stock nose wheel with a stock tire, you might consider changing to a Desser tire, they are better balanced.
- Last option would be to change to a Cleveland nose wheel and US Mfg 1500 6X6
Hope all this helps, give me a call Monday if you have questions 509-826-4610
On 3/15/08, Drew <lacloudchaser(at)yahoo.com (lacloudchaser(at)yahoo.com)> wrote:
| Quote: | Folks,
My CJ has always experienced an excessive shimmy, serviced the dampner (piston/arm not broken), linkages tight, replaced the tire (showed uneven wear/left side heavy)...no fix
Wheel assembly out of balance? Any ideas/experiences/solutions/instructions with this problem? Where/how to balance check.
Thank you,
Chunks
You can also reach me at lacloudchaser(at)gmail.com (lacloudchaser(at)gmail.com)
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Always Yakin,
Doug Sapp
Phone 509-826-4610
Fax 509-826-3644 [quote][b]
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