Suspension 101 questions

[Rebel1]

Originally Posted by justcobra

Thanks Les for the information on how the inner lower control arm is constructed using one inch tubing with a inner bolt being welded in place .
As expected this part is unique and has to be manufactured
As advised the rubber bush is then fitted giving the lower wishbone movement.
As to angles and dimensions one has to wait for this information when a hoist or pit is available.
I will extrapolate the information on hand with a Series 3 Jaguar front end already removed and apply it to the RMC.
In the meantime any other CC Forum members who can help it would be greatly appreciated as I want to get this right the first time.
Rx. Stanley.

Stanley, The inner pivot bolt is NOT welded in place. The mount is but not the pivot bolt itself.

My comment regarding the inner pivot bolt not rotating has to do with design of the Jaguar lower arms. When assembled and torqued to spec that pivot bolt compresses the rubber bushes to the extent that any movement of the control arm is by way of flex in the rubber bushes not by the pivot bolt rotating.

Note the page in my gallery showing the series 2 jag lower control arm dimensions. It indicates an inner measurement of 225.3 - 225.81mm (say 225.5mm as nominal.) between the legs of the arm when the pivot bolt is torqued to spec. As advised the inner mount is 210mm long.

That leaves (225.5 - 210mm) = 15.5 mm/2 = 7.75mm to allow for compression of the rubber bush on each side of the mount. Also note that there are two serrated washers between the rubber bushes and the mount which take up some of this distance.

This is why the jaguar service manual manual advises that the lower control arm bolt is not torqued to spec ( 32 - 50lbf.ft) until the weight of the car is fully on the suspension.