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Discussion Starter #1
Hi people, just trying the unenviable task of hunting down an intermittent rattle. Its most pronounced when the car is restarted after a drive and disputes when revs increase.

I've narrowed it down to supercharger coupler and or tensioner. Could those in the know look at my video please and report back if that free play in the pulley is normal. The free play is like a few mm either way and then is spinning the blades.

Also I noticed that the amount of movement in the SC tensioner to release was alot less than the aux tensioner had. Again is this normal or could it point to failing SC tensioner.

Thanks Drew
 

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Discussion Starter #5
Thanks, yes saw that one thanks for reminding me.

His XFR sounded awful and the amount of free play would have been colossal. Mine is an intermittent rattle.
 

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Thanks, yes saw that one thanks for reminding me.

His XFR sounded awful and the amount of free play would have been colossal. Mine is an intermittent rattle.
You'll hear it mostly when turning the engine off.
 

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Discussion Starter #10
Link to video
- when I spin the pulley its actually fully engaged and is spinning the blades.
 

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MY 2012 XF S Portfolio Ultimate Black
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Link to video
- when I spin the pulley its actually fully engaged and is spinning the blades.
That seems to be exactly the coupler. OE coupler leaves a bit of play before it’s fully engaged and that backlash is pre loaded with a spring. It seems on yours the spring is gone.
 

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Discussion Starter #12
To keep this thread updated so it might help others.

I spoke with a local Jaguar specialist who confirmed there should be very little (read minute) slack in the pulley until you feel the spring torsion and rotors move.

As its under warranty (dealer who sold car) its off on Thursday to be professionally diagnosed.
 

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MY 2012 XF S Portfolio Ultimate Black
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Would be interesting to see what it is. My guess is the coupler. That’s too much play I see in the video. However it shouldn’t affect performance of the car at all.
 

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Discussion Starter #14
Spoke to the garage yesterday and its definitely the coupler. Thankfully chains ect are all good.

Garage only fit genuine JLR snouts as the couplers wear and mess up the stem and bearings.

Dealer has been very good and already paid for the work to be done.
 

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Good news. (y)
 
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Discussion Starter #16
Good news the car is coming home tomorrow. Good job as my detailer has been booked in for winter prep since I purchased the car, thats the trouble using a good detailer they are busy.

The indy who did the job has put on the revised tensioner assembly as well. Apparently Jaguar recommend this revised part also is fitted. Basically its a plate which has the new tensioner and idler / guide wheel on it. I guess it must move the assembly away from the block by a few mm to avoid some sort of known issue.

When I get time I will post up some pics of the old snout which may be of interest to people.
 

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Good news the car is coming home tomorrow. Good job as my detailer has been booked in for winter prep since I purchased the car, thats the trouble using a good detailer they are busy.

The indy who did the job has put on the revised tensioner assembly as well. Apparently Jaguar recommend this revised part also is fitted. Basically its a plate which has the new tensioner and idler / guide wheel on it. I guess it must move the assembly away from the block by a few mm to avoid some sort of known issue.

When I get time I will post up some pics of the old snout which may be of interest to people.
Sounds like the the garage have dealt with the issue impeccably!
 

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Discussion Starter #18
Yes they have done the right thing. They did make a vain attempt to say the warranty limit was £500 and then offered to cover £1,000 of the bill.

I was not offended, I run my own business and I know times are hard and therefore I did not blame them for trying. I just explained that I expected them to pay for the full repair cost as it was obvious the fault was present at sale. I wanted to be reasonable and avoid corner cutting so agreed to cover mileage related parts that the indy felt should be replaced. I know the dealer for example would have wanted the same tension / guide pulleys to go back on.

I'm pragmatic enough to be fine paying for those items to be done. All in all I would buy from them again.
 

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Great news.

When mine failed the dealer rebuilt the snout at first, but when they got it all back together they found excessive play in the main shaft of the S/C so ended up replacing the entire unit.
 

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Discussion Starter #20
Great news.

When mine failed the dealer rebuilt the snout at first, but when they got it all back together they found excessive play in the main shaft of the S/C so ended up replacing the entire unit.
Thanks Chris, that matches what the indy told me. The dealer asked about rebuilding the existing snout rather than buying a new one. Indy said he wouldn't be part of it for reasons you experienced.

Car is back with me and it sounds so much better than before. I have the old snout and the coupler spring has gouged groves into the shaft. I will get some pics up when I can. Can you believe the wife has had me putting up the Xmas decorations today! Mind you little one (3 years old) was really excited and it made juggling work calls and decorations worth it.
 
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