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11.3 - Lower ball joint replacement, XJ40 upgrade ( Ryan Border,  )

The lower balljoints in the small saloons consist of a well designed durable assembly. However, as the internal parts wear, they require occasional adjustment- usually achieved by reducing the shim thickness between the lower A-arm and the ball-joint cap- which accounts for wear. They also require periodic lubrication.

It is not uncommon to find the lower ball joints in need of replacement, due to neglect from a previous (or sometimes the present) owner. In these cases, it is possible to replace the lower ball-joint with a unitized assembly from an XJ40 (1988 and up XJ6 in the US). This assembly requires no adjustment or lubrication. However they are rumored to be less durable than the original units IF the original units are properly, and regularly, attended to. 60Kmi instead of 90Kmi according to one source. Many Jaguar owners gladly trade off this durability for the maintenance free, cheaper, more readily available XJ40 alternative.

Installation will require removal of a steel ring in the upright. This ring is for the original ball-joint rubber boot retaining clip. Removal of this ring requires precise application of force with the utmost levels of accuracy: whack it out with a hammer and screwdriver. Once this is done, the XJ40 ball joint simply bolts in place of the old assembly.


 

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