XJ XJ6 / XJR6 ( X300 ) 1995-1997

Have you experienced heavy knock sound from front suspension?

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Old Sep 25, 2016 | 01:51 PM
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Default Have you experienced heavy knock sound from front suspension?



Original RH damper with buffer missing (disintegrated)




Original LH damper with buffer missing (disintegrated)




Original damper with buffer missing and replacement damper with yellow buffer clearly visible




Replacement damper installed on RH side


If you have experienced a heavy knocking sound coming from the front of your X300 when driving over uneven surfaces , it could be due to disintegration of the microvon buffers that are meant to isolate the top of the front damper stud from the inner wing through which it passes. Attached are some photos showing that the buffers on the damper side of the inner wing had completely disintegrated on my car. I chose to upgrade the whole dampers to German spec, but could have just replaced the buffers. It has cured the heavy knock sound, caused bye the top of the damper impacting the underside of the inner wing.


I hope that someone else may find this experience helpful.
 

Last edited by XJRengineer; Sep 25, 2016 at 01:55 PM.
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Old Sep 26, 2016 | 08:22 AM
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So, are you saying you replaced 8,9,10 and 11 in the image below?


http://www.jaguarclassicparts.com/il...es/sh5688a.png
 
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Old Sep 26, 2016 | 02:04 PM
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No, I replaced item 5 the complete damper assembly.
 
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Old Oct 3, 2016 | 11:45 PM
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Good tip, XJRengineer!

There are some additional photos here:

Welcome to Jag-lovers - Members Photo Viewing Page

Cheers,

Don
 
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Old Oct 7, 2016 | 08:14 AM
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When you say you "chose to upgrade the whole dampers to German spec" could you clarify this please? I didn't know there were different specs availabe.
 
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Old Oct 7, 2016 | 09:47 AM
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He is referring to the German "yellows" dampers.

German yellows : MNA2140BA
These supposed to be a bit "firmer" then green ones

Green ones : MNA2140AC for sport/XJR

Black/blue for sport : MMD2140CC

Black normal comfort : MMD2140AC
 
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Old Oct 7, 2016 | 12:07 PM
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I had similar knock but not as extreme - just worn yellow bushes. Shocks OK. These bushes were replaced, and worn front wheel bearings and worn axle spindles also replaced , for a much firmer quieter front end..
 
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