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Rear wheel alignment

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StevenA

Jedi Trainee
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I had the rear seal in my differential replaced a couple of years back... seal and all related. But, it was not done by a Jag shop. It is a 1994 Jag XJ6 VP... and since the replacement I have shredded a tire from un-even wear on the left rear (the side the seal was replaced on). The tire was worn completely to the cord on the inside and still acceptable tread on the outside. The tyre was not a Z rated tire so the load may have also been improper for it but there must be a method of alignment ????? Anyone know how?
 
With every wheel alignment, the rear should also be aligned on a Jaguar. It sounds liked whoever aligned your rear suspension discarded the alignment shims. The alignment is set using shims on the output of the differential flanges.
 
Steven,
Jack is correct in his assessment. Let me add a couple of things. On the axles, where they attach to the differential output shafts are 3 shims on either side. If these are not done properly, you get camber wear on the tyres -- which is what you have. Terrible wear on either edge of the tyre.
Any time you do any suspension work on these cars, you MUST do an alignment. On the rears, Jag even makes a tool called a Rear Camber Checking Tie Down Link (Part # JD145) This is basically a piece of wire with a hook on either end so you can hang the rear 1/2 axles level whilst you do your alignment. Specs for the rear are parallel to 1.6mm toe in (inclusive) WITH A CAMBER ANGLE OF -0.5degrees TO -1.0degrees.
MOST alignment people have this information. When I did my XJ40, we put it on the machine and we aligned it using the AllDATA computer specs and laser light to make sure it was all set properly. I have never had a problem with tyre wear or funny steering -- and the steering wheel aligns properly as well.
As for Z rated tyres, I don't use Z rated for any of my Jags. I am not one to need 150 MPH rated tyres. I make sure I have a speed rating of 120+ with a 400AA Plus rating for heat and wear. I usually get 50,000 to 60,000 miles out of a set of tyres. I also stay as far away from Pirellis as I can.

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