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had a 2004 Xjr and it was killing me with repairs. sold it and got 2014 with 41,000 miles on it. what a car! i am hearing like a knock but. what could it be? it has a supercharger.
From experience can be either or both. Supercharger coupler and or timing chain tensioners and guides. If the knock seems to be coming from the top of the engine it's probably the coupler.
Old style Guide worn mating surface New style guide has hardend mating surface new tensioner
Almost certainly the supercharger as the timing chains are quieter than a knock IMO. But you can use a mechanics stethoscope to isolate where the noise is coming from (less than $5 at harbor freight) to be sure though.
I can hear the SC coupling knock just a bit at shutdown on my 2014 XJR. 40K miles.
In fact I never even noticed it until I read the description on this forum. Just thought it was a normal noise!
Can you describe exactly when you hear it? Starting, stopping, at idle?
Coupler is VERY common. Timing stuff not so much. I recently picked up the complete snout with bearings but some people just replace the spring loaded coupler. However we have had people post pictures of the spring coupler eating into the metal shaft so I decided to change the entire front snout when the time comes. Paid about $200 including shipping from the UK.
Can you post the last 6 digits of your VIN?
From my research the XJ had the last timing equipment change at VIN V58603. We "think" this is the latest and greatest version done sometime in 2014.
My 2014 XJR is around V54000.
Also if you are worried try to post a video of your noise. I am sure someone on here can tell you for sure what it is.
But have you changed the water pump? This has been a trouble spot and I had mine changed at 33K miles by the dealer.
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Jaguar changed the recommended motor oil viscosity (! think it was in 2016) from 5W-20 to 0W-20 to minimize hydraulic chain tensioner wear at the first startup of the day. The thicker 5W took too long to build hydraulic pressure and caused noise and wear. Thinner 0W flows faster when cold. The viscosity is the same when hot - 20W.
I'm curious. If the thinner viscosity oil became recommended back in 2016, why do dealerships still use the 5W-20 variant for oil changes on pre-2016 models? Any downside or concerns in switching to 0W-20 from 5W-20 after using the latter for years?
Well it's been my experience that Jaguar dealers really don't have a clue what they are suppose to put in!
I fought with Jaguar corporate all the way to the UK before I finally got the correct rated oil put in.
I even sent them all the Jaguar requirements which are outlined in your owners manual. Still got the wrong oil!
From now on I will go back to changing the oil myself at my interval not this screwed up mess of 15K-16K miles!
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I change all oil myself on vehicles out of warranty too, but I'm still wondering about my original ask. Any concerns switching to 0W-20 from 5W-20 after several years of using the latter?
If you only hear it when restarting while the engine is still warm and then goes away after a minute or two, its normal.
is it low on the driver's side behind the wheel well area? possibly one of the two mechanical fuel pumps on the engine. lot's of 5.0 s/c engines do the same on warm restarts
is it low on the driver's side behind the wheel well area? possibly one of the two mechanical fuel pumps on the engine. lot's of 5.0 s/c engines do the same on warm restarts
08-25-2019, 12:14 PM
