vibration in my car

[56yblock]

hello everybody, i have a new problem,
my car vibrates between 70 km/h and 80 km/h. where does it come from ?

[JimNNN]

Under power or coasting?


Do you feel it mostly in the steering wheel, or is it more audible?

[Daves55Sedan]

If there is steering wheel shimmy, you need a proper front end alignment.
If a driveshaft or torque converter is out of balance, they will cause vibration, but I would think you would feel it at much lower speeds continuously.

[Alaska Jim]

you may have lost a wheel weight. if you feel it in the steering , especially if it is mostly around 50-60mph. some times you can drive "out" of it, by going slower, or faster. check wheel balance before replacing any thing else.

[56yblock]

thanks for your answers guys, the wheels balance are correct , if i roll under speed 50, no problem, and above speed 60 too, it's beetween that the car got vibrations, i hope that you understand me...

[richard crow]

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check the u joints in the drive shaft look for rust at the caps or a lot of play in the joint

[ponymare]

It could be the bushing in the rear of the tail shaft housing, but the driveshaft needs to be pulled to see.

[wellcraft17]

I had a similar problem and it turned out to be the original brake drums were way out of balance, balanced the drums and problem went away.

[50fordcoupeman]

Could also be a cord separation or bulge in the tire tread or sidewall.

[Anteek29]

To start, I would focus on the u-joints.

[Jwawhite]

Where can you find a shop that balances wheel drums??

I have the same situation as above, my wheels are balanced, my tires are fine, my u-joints are new, even the driveshaft is balanced.

I have not checked? the torque converter.

[Ford Freak]

Jwawhite - I would think that probably an engine machine shop ( that balances flywheels , etc ) would be your best bet .

[scicala]

Some garages used to balance everything together by raising the tire off the ground on the car and spinning it with an electric motor and a balance ring attached to the wheel. I think this practice is long gone though.


Sal

[KULTULZ]

Related reading - http://forums.y-blocksforever.com/Topic146811.aspx

[paul2748]

Try a shop that balances big truck tires. These may still be balanced this way.

Originally Posted by scicala

Some garages used to balance everything together by raising the tire off the ground on the car and spinning it with an electric motor and a balance ring attached to the wheel. I think this practice is long gone though.


Sal

[56yblock]

i've checked the u joint and i don't have a play

[ponymare]

U joints don't have to have loosness to vibrate, they can become dry and stuck and don't flex, one needs to remove the driveshaft and make sure each joint moves freely in both directions.

[rotorwrench]

9 times out of 10, a resonant vibration at a certain rpm is tire related. A tire can be in balance and still cause problems. I check them by rolling them off the car to insure they roll true. When you find one that flops over after rolling a few feet then you know you found the problem. Tires take a beating. they get flat spots from setting too much. They can have an almost unnoticeable ply separation that will show up with problems like this.

Most towns used to have at least one shop that had a dynamic rotational balance machine that rotates the whole wheel, hub, & brake drum or rotor on the car to get it all working together. The machines are still available but are expensive. You see them more at front end shops than at tire shops.

[Jwawhite]

Okay, having wasted time and money, I've come to the following conclusion:

I've seen each wheel on the car rotated while off the ground.
The front wheels were rotated up to 60 + MPH, one at a time by a machine with a roller, electrical motor. The LF tire rolled smooth, hand on fender no issues. When the RF wheel was rotated, it is obvious there is an issue, the RF fender was hopping.
The Operators opinion was the wheel is bent. I saw the lower inside wall of the tire with a wobble- I ALSO THOUGHT THE WHEEL WAS BENT.

I have American Classic Wheels and went over to Tire Pros where I bought them and stated the rim was bent. The wheel was removed and placed on a Balancer Machine and spun, the rim is not bent! Just what is happening, besides time and money?
Wheel was installed again and this time grabbed at 9 and 3 (just this Wheel off the ground) a good shake revealed worn out bushings at the Idler Arm.
Perhaps this is the cause of my wheel shake at speed....

[56yblock]

i've checked the tires , it's look like not bad, they are just 3 years,i have the white walls tires ply, the car began to vibrate at last springtime and before is there not problem like this....

[Jwawhite]

Raise one right front wheel off the ground, grab wheel by 9 and 3 o'clock and see if there is a lot of movement. Take a look at the Idler Arm to determine if the rubber bushings are kaput. Tell me what you find out.

[KULTULZ]

The LF tire rolled smooth, hand on fender no issues. When the RF wheel was rotated, it is obvious there is an issue, the RF fender was hopping.
The Operators opinion was the wheel is bent. I saw the lower inside wall of the tire with a wobble. I ALSO THOUGHT THE WHEEL WAS BENT.

Are you sure the tire itself is not bad? Switch front tires and see if vibrations moves to other side.

All bushings (idler arm - control arm - PS linkage) must be good. For example if outer tie rods are bad, you will get a front end vibration usually around forty to fifty miles and hour.

If vibration is felt in steering wheel, it is usually front related. Vibration in seat of pants, drive-line vibration.


Much less, with a loose front end, there is no way the front end can be aligned.

[dmsfrr]

Originally Posted by Jwawhite

... I've seen each wheel on the car rotated while off the ground.
The front wheels were rotated up to 60 + MPH, one at a time by a machine with a roller, electrical motor. The LF tire rolled smooth, hand on fender no issues. When the RF wheel was rotated, it is obvious there is an issue, the RF fender was hopping.
I saw the lower inside wall of the tire with a wobble- ...

... The wheel was removed and placed on a Balancer Machine and spun, the rim is not bent! Just what is happening, besides time and money?
....

Originally Posted by KULTULZ

Are you sure the tire itself is not bad? Switch front tires and see if vibrations moves to other side.
...

Swapping the RF tire & wheel to the LF will likely confirm that the tire itself is defective.
If the wheel spins true but the tire & wheel together wobble when they're off of the car, the tire is the culprit.
.

[Jwawhite]

O. M. G.

What does this printed word read on my RF Drum? The shaking side?

[KULTULZ]

Originally Posted by jwawhite

o. M. G.

What does this printed word read on my rf drum? The shaking side?

BENT!


If the drum is actually bent and will not sit on the hub correctly, that may be the cause of what you saw wobbling. It pushed the wheel out of line.

[dmsfrr]

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"Bent" is what it looks like from over here too.

[50fordcoupeman]

Yep looks like paint stick wrecking yards used.

[bobss396]

Swap the tires around, back to front and see how it rides. Where do you feel the vibration? Steering wheel, brake pedal??

[56yblock]

hat's what i've done,and it's the same thing....

[KULTULZ]

Originally Posted by bobss396

Swap the tires around, back to front and see how it rides. Where do you feel the vibration? Steering wheel, brake pedal??

Originally Posted by 56yblock

That's what i've done,and it's the same thing....

Feel in steering wheel or in the driver's seat?

If at speed, if you put it into neutral, does the vibration subside? Does it do it under power and/or coast?

[Jwawhite]

Open the hood engine operating in park, position the throttle at cruise speed, does engine shake?

[56yblock]

both...

[Rusty Junk]

I had a Ford with a driveshaft that was made up of two parts with rubber in the center, anyhow the shaft had come out of faze ever so slightly causing the vibration. My fix was to have a new one peice shaft made and vibration was gone.