EuroJeep

Just wondering if it is normal...

Even at quite low speed they squeal when doing a u-turn.
I notice this in 2WD (didn't try in 4WD)
Oil has been changed 3 months ago (80w90 if I do remember well + crown additive)

I also have quite a lot of noise from the back when driving at highway speed.
Like a low frequency hum. It is far too loud to be normal.

I have difficulties finding a shop willing to work on the car.
So I have to figure out the cause by myself and ask them to change the part.
Yes it issn't the perfect way..

Luckily the forum helps

MaskedMallard

First, I want to complement you on your use of American English spellings.

The tires are going to squealing. If you think about it, the rear tires are pushing the vehicle forward, while the front wheels are resisting the forward motion (friction), producing the squealing. In 4WD, you will notice the vehicle will want to "hop" in a u-turn. I wouldn't recommend a u-turn in 4WD, unless you are on a slippery surface / a surface that will forgive.

The rear noise could be;
- tire out of round.
- exhaust drone.
- wheel bearing that has / is failing.
- rear differential bearing.

If you are able to elevate and support the rear axle, you could then have some operate the gas / accelerator pedal while you listen to various parts on the axle with a stethoscope. Just don't put the stethoscope directly onto a moving part. This should help you determine where the noise is coming from.

EuroJeep

Hi

I do my best, I am just french ...

So it is normal, even in a roundabout. Ok

I'll investigate when I'll have the opportunity to elevate the car.

XjJunky

Mine does it quite a bit. Mostly at slow speed in parking lots. I do have over sized tires too though

EuroJeep

I am full stock. except a small lift in the front to be straight after installing new rear leafs.

I just wanted to check that it isn't an obvious sign of future issue..

EZEARL

Have you had a frontend alignment done?

peligro113

Tires squealing on a turn can also be a symptom of your toe not being correct. How is your tire wear?

IJM

Front tires scrubbing/squealing at full lock on low-speed turns is quite common and normal, assuming you're not getting abnormal tire wear. Because the radius of the turn is so tight, both front tires need to follow different radius turns, and the suspension geometry usually won't allow this at extreme angles, so you get some tire scrub. It's especially noticeable on slippery surfaces like parking garages where you'll hear a lot of tire squeal.

318SixPack

Ackerman angle was never perfect on XJ?

EuroJeep

I'll do a check.
Tires are new (300 kilometers)

IJM

Yeah, that's my guess.

dave1123

Low tire pressures can cause some squeal also. I notice it more on sealed asphalt because it is more slippery. Rear wheel drive cars are known for this.

Steve Hayes

^^^^This! Full Ackerman will steer the inside tire on a tighter turn radius than the outside tire. Without proper Ackerman tire squeal is common at full or nearly full lock. As mentioned, as long as the tires are not showing excessive wear in normal driving don't worry about it.