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Old 04-17-2012, 11:52 AM
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Angry Strange tyre (tire) wear. JGC 2.7 CRD 2002.

Hi all,

I'm getting some weird tire (US)/tyre (UK) wear on my Jeep. When I bought it 2 years ago I noticed that the N/S (left) front tire was badly worn on it's outer (left) edge. I insisted on new front tyres before purchase and that the track should be checked. This was duly done. I know the track had been altered as clean thread was visible on the trackrod.

After 15 months and about 4000 miles the L/H front was more worn on the L/H edge than over the rest of the tire. I had a specialist tire fitter swap the tires from left to right and vice versa, maintaining the same direction of rotation, and re-check and adjust the track. After another 2000 miles the now L/H (formerly R/H) tire is showing signs of the same symptoms.

The Jeep has just been in for service and the wheel alignment, track, camber and castor all checked with laser gear and found to be O.K.

My experience tells me that usual causes of this problem are :-

(a) Excessive toe-in, which one would expect to affect both front tyres.

(b) Grossly excessive positive camber on the affected wheel or

(c) Negative castor, which which would cause the outer edge to 'scrub' when turning.

Assuming that the service engineers know what they are doing, and all the above are as per the manufacturers specifications, what the hell is happening?

As the 2002 WJ is beam axled at the front I wouldn't have expected camber or castor to be adjustable.

The only thing I can think is that the LSD (limit slip diff) in the front axle, if indeed it has an LSD, is not permitting the L/H wheel to rotate at the correct speed when cornering causing a 'fore and aft' scrub, rather than a sideways one. When I was stock car racing the cheaper alternative to an LSD, and stopping wheelspin, was to weld up the planet gears in the diff. This used to have some weird effects on tire wear when racing on tarmac!

Has anybody experienced similar, and do you have a solution. I don't like tires becoming illegal at the rate mine are!

Help please!

Tony N
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Old 04-17-2012, 04:25 PM
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Re: Strange tyre (tire) wear. JGC 2.7 CRD 2002.

I don't think It would be a lsd problem. You would definately feel that I would think.You also ruled out a bent rim and sounds like you went to 2 different alignment shops. They should have been able to pick this up on the machine.You're right about the castor and camber.There is no adjustment. It wasn't in an accident by chance? Maybe bent control arm or ball joint on that side? Bad control arm bushings or ball joints on that side? But then again the machine should have caught it. I would take it to a quality alignment shop and have them show you the factory specs and then show you yours right on the screen as they are aligning it.
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OK, fine...I'll admit...some amber lamps are good, and necessary.
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Old 04-17-2012, 08:53 PM
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Re: Strange tyre (tire) wear. JGC 2.7 CRD 2002.

Bad tie rod ends were causing excessive wear on my tires, but the alignment shop should have checked those before doing the alignment (thats how I found out mine were bad). Could also be bad ball joints on the knuckle, but you would probably feel that in loose or wobbly steering, and the alignment shop should have checked those also. Does the jeep steer straight down the road?
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Old 04-18-2012, 05:37 AM
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Re: Strange tyre (tire) wear. JGC 2.7 CRD 2002.

It wasn't in an accident by chance?

I don't think so, as I got pretty comprehensive service records with the vehicle, which don't include any reference to repair work.

Does the jeep steer straight down the road?


Yes it does. As you probably know, most of the 'ordinary' roads in UK are narrower that those in the US and tend to be cambered. Driving in the middle of the road the Jeep tracks dead straight. Tends to very slightly veer to left on L/H side of the road, and to the right on the R/H side, due to the camber.

Although I didn't see the tracking check done myself I would imagine that, from the fact that they noted as 'AMBER' on the service report "Both rear anti roll bar linkages worn", that have checked all linkages and joints.

Guess I'll have to resort to the only 100% reliable guy I know, and roll under there myself.

Cheers

Tony N
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