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Re: my 1989 jag xj6. the rear suspension (shocks) are...
Yes, replacing the self leveling rear shockers with gas shocks, is the way to go.
The self leveling system was notoriously problematic.
Due to either to the leveling sensor going faulty, and making the car go up and down, whilst sitting at the lights. ( Do not be surprised to see that yours has been disconnected. )
Other problems are loud knocks over the big bumps, and finally oil leaks from the shockers.
Yes Jaguar in there wisdom, did not make things easy, and new gas shockers will not match your old springs.
I do have all the Jaguar part numbers somewhere for this job, if you want to keep it all Jaguar.
( let me know and I will have a look !)
I have seen in the past, Modification Kits being offered in England, but would have to get back to you with source.
I see you are in Canada , and I am in Spain, and not familiar with your spares situation out there.
You will be requiring 2 Gas Shockers, 2 Springs and retaining collets, and plates.
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top up/level plug located on the rear of the axle case,a pig to get to you need half inch square axle key or similar i use a universal joint and bar/ratchet the anti roll bar or stabalizer gets in the way! depending sport suspension or not, the correct oil is shell super 90 or jag. synthetic diff/final drive oil or you could use ep 90
if your in doubt about the functionality of the suspension system a quick way to check and see if the static pressure system is working properly is totake a floor jack and raise up the opposing side that you have questions..The system stores 228ps in the retantion tank located under the spare tire.As you force the air to one side the recycle valve will release the air to lower the cars' body.You wil hear it come out,then lower the jack,then the air from the tank will refill the lost air....Turn on the car to initiate the air pump to refill the rear tank,you should feel the car raise up in the front evenly.Last but not least my suggestion is if you think another shock is leaking you can 1st check the caping on the shocks...at times they will leak slowly on the caping...it will start as a weeping leak and you cant hear it....you can get some soapy water and lightly spray it around the enter deck mounts location under the hood where the air lines feed into the shocks...if you see air bubbles,then you can easily pack a towel in the leakage until you find a used shock or rebuilt one off ebay....But you fault light wont display a mil.The fault light only comes on when pressure is lost from the shock,or a static line has failed...causing one shock to lower to be lower..The CAN will trigure a fault code as the sensor detects body uneveness..Usually when this happens you will see a fault code,but I doubt this is your issue.
I am not sure but.....
There is a level device located on conductor side, below the car near rear wheel. you will find it because is located on the chasis or inmovible place and the lever connect it to the back suspension, so, it the lever will move up and down when you push car defese down.
Disconnecting cable harness will inhibit the function.
BUT, Strongly recomend no to disconnect, but fix the original crank problem To disconnect it will modify suspension response of the car and a lost of stability at high speed
the strut/spring is one assembly that comes out as one unit. The 1989 XJ6s'(USA) had self leveling hydraulic suspension. Is your new strut correct or has your car been retrofitted to conventional shocks?
No. But if can't get it on a lift or high enough to work under comfortably..it will be very awkward. The calipers get in the way when you are removing the springs and shocks as a unit. You can move the part and get it out and down, but you will need to remove the rear wheels and let the rear springs hang down. Make sure you have a good spring compressor to get the old springs off....in most cases it is the springs that go soft and not the shocks... Don't assume that it is the shocks unless you know for sure they are bad.
My 1994 Vanden Plas makes the same noise. I know I need rear shocks. You do also!! Have the rear shocks replaced.
Bilstein part number B46 1858 or Koni part number 30 1377. Actually the Bilstein is the better shock and less expensive.