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Q for old car people and mechanics here (followup from Ask a Mechanic)

Posted on 3/21/17 at 5:24 pm
Posted by chinhoyang
Member since Jun 2011
23406 posts
Posted on 3/21/17 at 5:24 pm
1932 Buick, chronic shimmy problem, all front end replaced except steering gear.

Suggested problem (which I believe correct) was either flat spots in tires or steering gear (which has not been replaced).

Tires are ten year old tube tires. The car is a heavy car and is not driven much. Are these old enough to develop flat spots (we haven't had this problem with other cars but this one has the narrowest tires and is the heaviest). Steering gear will require a custom rebuild as the part is not available. Would you go with the tires first, or the steering gear? Would radial tires possibly help?

This has been a problem for several years. Any help would be appreciated.

Posted by FloridaMike
Member since Dec 2012
1524 posts
Posted on 3/21/17 at 5:28 pm to
Not sure, what I do know is that if I had that car I'd find me a Bonnie and go rob some banks
Posted by chinhoyang
Member since Jun 2011
23406 posts
Posted on 3/21/17 at 5:31 pm to

quote:

Not sure, what I do know is that if I had that car I'd find me a Bonnie and go rob some banks


39 Buick is a better gangster car.

Posted by Gaspergou202
Metairie, LA
Member since Jun 2016
13496 posts
Posted on 3/21/17 at 5:35 pm to
Does shimmy change after tire rotation?

Have front tires been balanced? Possibly a missing wheel weight.
This post was edited on 3/21/17 at 5:45 pm
Posted by GetBackToWork
Member since Dec 2007
6260 posts
Posted on 3/21/17 at 5:39 pm to
Usually you can see flat spots.

What about front wheel bearings? When they get loose you can get a shimmy. I'd also make sure the front end parts are set correctly. On cars a mechanic may not see very often, they may not always be dialed in just right.
Posted by maximum overdrive
DFW
Member since Dec 2015
2205 posts
Posted on 3/21/17 at 5:41 pm to
quote:

ten year old tires


Bingo.

Old tires killed Paul Walker.



This post was edited on 3/21/17 at 5:42 pm
Posted by cdaniel76
Covington, LA
Member since Feb 2008
19699 posts
Posted on 3/21/17 at 5:48 pm to
Rail cars in the background...

You riding the rails again?
Posted by chinhoyang
Member since Jun 2011
23406 posts
Posted on 3/21/17 at 6:05 pm to
quote:

Have front tires been balanced? Possibly a missing wheel weight.


They should be balanced. The shimmy starts at about 45 mph and is bad enough that the car is not driveable at that speed.
Posted by LSUwag
Florida man
Member since Jan 2007
17319 posts
Posted on 3/21/17 at 6:11 pm to
I would start with the obvious which is the 10 year old ties.
Posted by Nado Jenkins83
Land of the Free
Member since Nov 2012
59651 posts
Posted on 3/21/17 at 6:11 pm to
Can you jack it up on each corner and give it the 3-9 and 12-6 shake?
Posted by Gaspergou202
Metairie, LA
Member since Jun 2016
13496 posts
Posted on 3/21/17 at 6:50 pm to
quote:

They should be balanced. The shimmy starts at about 45 mph and is bad enough that the car is not driveable at that speed.

Rotate them. Quick and easy diagnosis.
Posted by pioneerbasketball
Team Bunchie
Member since Oct 2005
132351 posts
Posted on 3/21/17 at 6:52 pm to
(no message)
This post was edited on 4/19/17 at 11:59 pm
Posted by chinhoyang
Member since Jun 2011
23406 posts
Posted on 3/21/17 at 7:21 pm to
quote:

Does it need gas?
Straight 8 motor runs very smoothly.
Posted by Kafka
I am the moral conscience of TD
Member since Jul 2007
141958 posts
Posted on 3/21/17 at 7:22 pm to
do you mean old car people or old car people?
Posted by chinhoyang
Member since Jun 2011
23406 posts
Posted on 3/21/17 at 7:28 pm to
quote:

Rotate them. Quick and easy diagnosis.
If they have flat spots, this may not work (as all four tires will probably have flat spots) but it will find out if they are out of balance. I hope it is not the steering gear, as it is going to be a huge pain to get the work done.
Posted by Gaspergou202
Metairie, LA
Member since Jun 2016
13496 posts
Posted on 3/21/17 at 7:48 pm to
Flat spots usually give you a thumping sensation at all speeds and usually makes noise.
Just did a quick internet search. This is from aa1car. Com:
quote:

Symptoms of Tire Imbalance An out-of-balance tire and wheel will typically create a vibration or shake that becomes progressively worse as the vehicle speed increases. The speed at which the vibration first becomes apparent will vary depending on the size and weight of the tires and wheels, the size and weight of the vehicle, the sensitivity of the steering and suspension and the amount of imbalance, but usually starts at 40 to 50 mph and increases in intensity as the speed goes up.

A rotation can't hurt an it's free.
Posted by meauxjeaux2
watson
Member since Oct 2007
60283 posts
Posted on 3/21/17 at 7:51 pm to
I'm going to stick with my first assessment and say flat spots on the tires
Posted by Masterag
'Round Dallas
Member since Sep 2014
18805 posts
Posted on 3/21/17 at 7:53 pm to
get a new car baw
Posted by BHM
Member since Jun 2012
3150 posts
Posted on 3/21/17 at 7:57 pm to
Correct, if you have flat spots then chances are all four tires have flat spots and rotating may not eliminate the problem.

I run my Gravely zero turn tire pressure low. After just one week of sitting, I can feel the flat spots when driving on the road and driveway but it goes away quickly.

I would put the car on jack stands and inflate tires to maximum rates pressure for couple of weeks. Then drop it down and take it for a quick test drive. If it is noticeably better then flat spots might be the problem and storing it on stands might be the simple solution.

Other than that I would try a well experienced alignment shop and get their opinion. Zims on Verot School Road in Lafayette would be my suggestion if you are around Lafayette.
Posted by GreasemonkeyJr
Member since Feb 2017
92 posts
Posted on 3/21/17 at 7:57 pm to
quote:

I'm going to stick with my first assessment and say flat spots on the tires


Wouldn't it have to have play somewhere?
I've had a bunch of bias ply tires that will get flat spots but unless there's play they're always drivable.
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