Is this a bad coupler/isolator?

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Jul 4, 2018 | 02:36 PM

marvelouzone

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From: baltimore md

Is this a bad coupler/isolator?

Just got a 2011 XJ that needed a very few minor things. It runs great, with the exception on a little shake at idle, only codes I have found is a po442 using the icarsoft LRiI.. wondering how hard the plugs are to change, because it has just hit a 100k. Also it has a loud startup clatter which I’m thinking is the coupler/isolator going to try and upload video to get your feedback

Jul 4, 2018 | 04:20 PM

TNJohn

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From: SE Tennessee

Shaky idle and loud clatter at startup at that mileage would have me inspecting the timing chain tensioner and guides as soon as possible. A failure there causes catastrophic engine damage.

Jul 4, 2018 | 06:47 PM

marvelouzone

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From: baltimore md

Quote:

Originally Posted by TNJohn

Shaky idle and loud clatter at startup at that mileage would have me inspecting the timing chain tensioner and guides as soon as possible. A failure there causes catastrophic engine damage.

Will definitely look into that, but I did notice that the clatter is gone when removing the supercharged belt. I had to remove in the evening when parked for the day, because it only happens for a few seconds when first starting the car for the day, doesn’t do it on every startup. How involved is the timing chain tensioner and guide? I’ve done it on a few vehicles, but have to admit never touched the 5.0 jag/rover motor. Touched plenty Mercedes 5.0’s though..

Jul 5, 2018 | 08:08 AM

TNJohn

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From: SE Tennessee

My days of engine repair are nearly over, just don't enjoy it like I used to, so I have all work done at the dealership. I shouldn't think it would be beyond your ability if you've done that kind of work on Mercedes. I'm quite familiar with a m113 as well.

Jul 5, 2018 | 12:07 PM

XJ8JR

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From: Spring, TX

As I understand it, the 5.0 engines are not as silky smooth as the old 4.2s were. Is it a vibration felt through the car or are the RPMs actually bouncing around?

Jul 6, 2018 | 11:33 AM

clubairth1

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From: home

You have the smaller 6mm timing chain setup. This has been replaced by Jaguar and upgraded to 8mm chains. Don't ignore the noises as I think you are hearing chain rattling along with a worn SC isolator.
The isolator won't cause any problems just noise BUT those darn timing chains are an engine disaster for sure!
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