My Jaguar Xtype v6 3.0 has 140000 km's on the clock, but the engine has a rattle in it when is press the gasspedal and relaese it, the engine rattles briefly.

idle the engine sounds great. no noises at all.
when revving 3000-4000 rpm the sound is there.

wat should i look for?

 

I Should be more specific.
I am from Holland so please forgive me when i say something wrong.

So i bought a Jaguar x-type 3.0 v6 from 2002 with 140000 km's on the clock.

It is a nice car inside and outside.
There was a pile of documents included with the car, about maintainance and repairs and bills. no shocking things in my opinion. regular oil changes.

the car stood still for almost 1 year before i bought it.
when i went for a testdrive te car wouldnt start due to dead battery. but we jumped it and we drove off. everything went well.
only one problem is that the car makes a rattling sound.
the rattling sound is heard when i press the gasspedal and then, when i rev it to 3000-3500 rpm there can a rattle be heard. especialy when i release the throthle you can hear this sound. then te sound fades away to eventualy stop making noise.

when te car is just idling, stationary. the engine does not make that noise.
it is a quiet car, no weird noises can be heard.
also in the car, when driving it, you can not hear the sound/noise.
there is no stuttering of the engine it runs smoothly.

we opened the engine so that we could see the camshafts. they look great, no wear or damage.
we inspected the hydraulic lifters by pressing them with a screwdriver. they do not feel spongy or soft, they all do feel with the same resistance.
de chain is not too loose. and does not look damaged.

we removed the oilpan to check for metal particles.
the oil was colored black/brown but there was no foam on it when we drained the oil.
the bearings of the crankshaft was my biggest concern but they were not damaged. just 1 of them showed a little trace of wear. not shocking.
while i was there i tried to press the piston to look for any play up and down.
there was no play at all. i am relieved to see it was all allright there.

the powertrain, i felt some play on the alternator, but very little. also the water pump has a little play. it all feels accepteble to me.
the belt has small dry cracks in it. it needs replacement. but it was not very loose.
the chains seem okay to me, the chain tensioners i cannot see or test in this stage.

Guys please, where should i look out for.
tell me something i have too look at.
the noise does sound mechanical, but there is so much going on in that engine bay that might look over something.

i removed the sparkplugs and i noticed that piston 6 has a slightly darker/wet appearance. i am looking trough a hole but it show it is darker. inside.

while i was under the car i saw that the drive shaft to the back of the car has green oily stuff leaking out. it splattered all over some heat shield under the car. looks like a loose rubber seal.

looking forward to hear some advice/ experience.
greetings bastiaan

 

Yesterday i watched a video on Youtube:
I know i have a 3.0 V6 from 2002 but it sounds just like my engine.

i did not rev it that hard, but you can hear that the engine sounds ok when you do not press the throttle.

do any of you guys also think that this noise is caused by a loose timing chain?
because i checked the big ends already and they are ok.

wich parts of the engine do i have to replace?
can it be done with the engine in the car?
is there anybody on this forum who did this himself?

greetings, Bastiaan

 

Goodevenig guys, maybe some of you watched the youtube video above.
could you please tell me what we are listening at?

greetings bastiaan

 

I am definitely not the person to reply, but The most likely culprit is going to be a waterpump, waterpump tensioner pulley or serpentine belt pulley. Unless severely mistreated, these engines don't seem to have issues except for very rare occurrences

 

There was a TSB (XT307-03) for Scraping Noise –1600 RPM, 1800 - 2500 RPM.
Install Modified Flexplate.

bob

 

I like the advice above. My noise was more like a knocking, did not sound as rattly as the video. The cast cage on my alternator was cracked.

 

Goodevening gentlemen,

thanks for your reactions.
today we inspected the engine some more, the focus was on the Timing Chain.

we let the engine in the car and got the side off so we could see the timing chains.
it was very hard to do.

we tried to look at the chain tensioners if they were damaged. i could not press them in with my fingers. they feel very sturdy still.

i expected to see damaged slides or difference between the two tensioners.
i cannot say that they were dat damaged, it looked alright.

Please see the video i made of the chain tension below. thank you

 

 

I do not have that much experience with timing chains.
So please tell me if that chain is too loose.
the car stood still for almost a week now.

if any of you guys see something suspicious let me know.

 

 

In the video above you can see the difference in tension of the two chains.
the last one you see is the one with the most play.
it moves more as i apply the same movements.

should the both chain have the same tension?
because they definitly are diferent.

 

Does this like it is damaged?

 

What we checked so far

-chrankshaft, no vissible damage
-crankshaft bearings in the big end, 5 of them ok, 1 has a little scratchmark.
-pistons, no play on the piston heads
-pistons, 5 of them have are dry on top, 1 is darker and apears more wet on top.
-piston rods, none of them are bent or broken.
-spark plugs, look ok. not damaged or molten.
-fuel injectors are all working.
-Hydraulic lifters look ok, no signs of wear.
-camshafts look ok, no signs of wear. not bend or broken
-chains, they both do feel a little loose, one more then the other as seen in the vids.
-chain tensioners, no visible damageor signs of wear.
-exhaust camshaft sprocket does have a little damage.
-inlet camshaft sprocket does have a little damage.
-oil looked a little dark when drained.
-oil pan no signs of debris in there, clean.

 

Have you run the engine with no belts to eliminate all the spinning stuff, or rubbing on spinning stuff?
Is it an automatic tranny?

 

Innzane,

I did not run the engine without all the spinning stuff.
My colleague told me it was the hydraulic valve lifters that made the noise.
no doubt about it it was something else.
so we started to dismantle the engine right away.

indeed we should have checked the spinning stuff first. too bad we did not do that.
now we are at the point that the timing chain cover is opened.

i do have an automatic gearbox yes.

 

Hi, have just been reading your posts about the Jaguar X Type: I have exactly the same rattle. I can hear it only with the window open or from outside. When cold it is not there, not under any kind of effort, you can hear it when you release the trottle.
Nearly one year has passed, did you discover more?

Hope you can read me.
Greetings

 

Replace all the engine mounts
Walter

 

Are you sure its coming from the engine and not the transfer case? If i hit mine hard i hear a rattle from the case not the engine. And yes i know my t case is going to go. It has 200k on the spedo.

Thanks,
The Dr

 

The timing chain is only a little sloppy; probably still well within specification.


That said, if you are this far into the engine, you might as well "freshen up" the top end a bit.