I have a problem!

8 different Jaguar Mechanics in 4 workshops has "consulted" my car.....the diagnose is not final but here it goes.

Background:

The car has 122.000 km = 76.000 miles on it. The car is from 1999 - has been serviced at a authorized Jaguar service.

The car have had a new cylinderhead in the right side at 105.000 km. (I dont know why - I bought it used at 120.000 km)

The chains and chain-tensioners we renewed at 105.000 km also!

It has a lot of oil smudge that has been cleared by motor-service-liquid!

The tapping noise is only there when cold - and disappears after 10 min at 600 rpm. (please see below links for sound when cold and "warm":


after 10 minutes



Ok now the first Jaguar service said:

1) It might be the valves that is the problem - we will give an oilservice - so the oil were change and oilservice added - the engine ran for one our - and the oil and oilfilter was changed again and new oilservice added (two cans) and again - oil and oilfilter changed and engine ran for 1 1/2 hours and oil changed again.

Did NOT help!!!

2) A new Jaguar Service told me that the chain was loose!

3) the third Jaguar (official importer in Denmark) had a look and told me it was the third cylinder in the right side from the front (on 4.0 jags this is referred to as cylinder 3 on right bank)

4) A fourth independant repair service - told me it couldn't be the cylinder that made the noice as it was definately comming from the front of the engine and NOT from the cylinder almost back in the engine!

5) The 5 (fifth) jaguar service that makes the danish Queens jaguars and Rolls Royce cars opened both valvecovers and started the engine shortly.

on the right side a 5 mm thick oil sprayed out for around 3-4 meters whenever the engine was started - it shouldn't do that - they told me!

Their best guess without opening (10-13 hours work) would be that something is wrong with the VVT and that it is not getting enough oil.

But they cannot be sure!

ANY good ideas would be welcomed

Best regards Niels Juul-Jensen

 

If you rev the engine when cold, does it stop rattling? Listen to my video, here.

https://www.jaguarforums.com/forum/x...d-video-61236/

 

Welcome to the forum Niels,

Good to have you with us.
I've copied your post over to the XK8/R section so you can continue the technical discussion there, follow this link to find it https://www.jaguarforums.com/forum/x...g-sound-82756/
Enjoy the forum.

If you haven't done so already you should add your car details to your signature to help others to help you.

 

Welcome to the forum Niels,

Sorry to hear about the issue with your XK8.

Follow Norri's link to the XK8/XKR section where you should get good advice on possible causes of the noise. Hope it's an easy fix.

Enjoy the forum.

Graham

 

Hi Rob - thanks for responding to my request.

It is very much the same sound as in your videos.

Anyway - when revving the car the sound just get quicker and you could think it was gone but it just increases in speed along with the increase in Rpm. But when driving it disappears after 5-8 miles/8-12 km or when running for 10 minutes by 600 RPM.

Did you solve your problem??

 

Niels- I didn't pursue my noise any further. After researching it, I feel it is from the VVT system, and since it goes away right after starting from cold, I haven't bothered to chase it down. I have tried heavier and lighter oil viscosity, and the product "Restore" and nothing had any effect.

BTW, I was in Copenhagen a few years back, on business, and I loved it.

 

welcome aboard, good to have you here with us here at JF

Great intro, full of info, thanks for sharing.

As stated this is the new member section and really only for intro's
Please visit the relevant section and I'm positive you'll get all the help you need..................good luck

Any useful information you may need such as how to post pictures, edit signatures, add videos, use the search facility etc, can be found here
Helpful_information

Check out the regional section for your area?
There are lots of members local to you with the same interests.
Regional - Jaguar Forums - Jaguar Enthusiasts Forum

Please Jump on in and enjoy the site.................

 

Hi again Rob,

I think it must be the VVT - unfortunately the VVT costs around 1000$ in Denmark (6.439,- DKK) and the work to change it is around 100$ x 12 hours - not a cheap one :-)

Good to hear that you liked Copenhagen - I myself was in Montreal in 1993 - very nice city - but it was so freezing cold minus 28 celcius (-20 F) it was in january and as I worked for a clothing company at that time - and I had the newly arrived sommerclothes on - I was freezing like hell - NOT a good idea. Should you ever visite Copenhagen again - lets have a beer downtown :-)

 

I have a 1999 XK8 Coupe. At about 40K miles on a new (rebuilt) engine a ticking sound appeared. Both a dealer and an independant could not locate it. All specs for the tappets and cams were correct, but it did appear to be located in the tappet area. So, I changed all the tappets-by the way under an extended warranty. The ticking is still there. Again the dealer and the independant speculate that a tappet might be loose in the bore-that is a bore is enlarged. They recommend- 1) ignore it 2) change the heads. As it happens I have the engine that was original to the car and I could put in those heads. Another thought is that despite measurements being within range, I could change the valve cam shafts-it isnt as expensive as replacing heads, and who knows, it might work.
Comments ar welcome

 

Niels - have you considered changing the VVT yourself?

It would save you the labour cost.

If you did attempt it you would want to confirm which VVT is the culprit first, and if you are having trouble locating the sound source you might find a stethoscope a handy aid.

 

The VVT is operated by oil pressure or should I say oil flow. From what I understand and I must admit I have little experience with the VVT it is a critical part in delivering oil to the upper end of the engine. Now my question is what type of oil is in the car and what viscosity? Would it be worth trying to use a higher quality of oil with an oil additive and change it a few times before digging in to replace it or them?

 

Hi Jagalways

Thanks for your comment - however the a ticking sound could be ignored but this is really a KNOCKING sound and hard to ignore - The pedestrians think im exploding and run for cover - more or less :-)

 

Hi Roadhogg

Thanks for your kind comments. For me it is not an option to do anything myself - I would ruin more than help the problem................

And you are right a stetoscope is handy and have been used by all four services - and the sound comes from around the VVT.

 

Hi Gus,

As explained in my "question" the first repair service thought it has something to do with the valves and the fact that the car had som oil-smudge. Therefore the car had changed oil three times and all times additives were added to clean the engine - and in the last oilchange som additive that cleans the valves (supposedly) were added. I believe the oil is 5/40.

Please let me hear from you again if this makes sense and you have other ideas.

Thanks Niels

 

I am not sure what you used but BG products are the best I have found. It sounds like you are on the right track and at this point it is a matter of time. I am adding a link for BG products for you to read about and would recommend trying the one that fits your needs.

Link BG Products, Inc.

I hope this helps.