Question about 1999 Jaguar XK8

1 Answer

Hello I have a jaguar xkr 99 with ratteling sound from front part of engine the sound continues without serpentine belt and also without super charger belt can this be from tappers and what to do ? With my best regards Michael Joyce

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  • michaeljo610 May 20, 2011

    Thanks Azraelsrl!
    The sound is more of a clanking sound and it disapperars when I rev the motor.

    With my best regards

    Michael Joyce

  • michaeljo610 May 20, 2011

    Thanks Azraelsrl!



    The sound is more of a clanking sound and it disappears when I rev the motor.



    With my best regards



    Michael Joyce

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  • Jaguar Master
  • 11,800 Answers

This motor has a DOHC configuration with hydraulic self-adjusting tappets - so a noise on them is practically impossible unless they are worn out to a level that makes the functioning of the motor problematic.
The noise is almost surely coming from one of the distribution chains, the automatic tensioner has failed and the chain is now loose.
Here
http://www.mediafire.com/?nkz20lhkzjn
you can find an engine repair manual with diagrams - the tensioner will have to be replaced.

Posted on May 19, 2011

  • Azrael SRL May 20, 2011

    It's the tensioner plate, it's hit by the chain. The sound disappears because the chain gets tensioned by the effort put in it by the crankshaft at higher revs and the resulting centrifugal force. You will have to access the distribution to replace it.

  • Azrael SRL May 20, 2011

    But it might be also caused by detonations - check the sparkplugs , replace the fuel you are now using and run a cleaning fuel additive.

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