XJ6 & XJ12 Series I, II & III 1968-1992

Series 3 irregular rattle noise

 
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Old 03-23-2019, 01:23 PM
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Default Series 3 irregular rattle noise

This rattle sound has been annoying me the whole time I've owned this car. Doesn't seem to translate to anything performance wise; it's just constantly annoying. Sounds a bit like exhaust baffles ratteling. Does Anybody know what this is? I've heard it from other S3 Jags but personally I've no idea the cause.

 
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Old 03-23-2019, 02:11 PM
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I couldn't hear the rattle, but your car is beautiful.
 
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Old 03-23-2019, 02:19 PM
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remove the exhaust side cam cover and check the Tappets and to see if the tappet holdown kit has been installed.

if the tappet holdown kit is fitted, then it sounds like the timing chain adjuster has lost its vinyl piece. Time to inspect the timing chain.
 
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Old 03-23-2019, 02:49 PM
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I had a similar rattle but mine wasnt all time, which made it hard to locate, mine ended up being the rivets on the flex plate, found a newer one online without the rivets, apparently it was a common issue, some people had luck simply staking the rivets, I however did not..
hopefully yours isn't this as either engine or trans have to come out to replace...
 
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Old 03-23-2019, 09:30 PM
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Most of mine sounded like that at the start of ownership.

Tappet adjustment cured 98% of the tappetty noise I hear in that video.

The 2 S2 cars had erratic rattles, and eventually the exhaust side bucket guides were found to be moving, ever so slightly, so stake down kits fitted, and ALL the XK engines became silent.

Top chain adjustment is also a rattler if too loose, and a "whirring" if to tight, so a balance needs to found.

Yours sounds VERY "tappetty" and that needs addressing, and whilst in there do teh stake down if its not already done.
 
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Old 03-24-2019, 06:19 AM
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I hear fan rattle, or what sounds like fan rattle. I have the same. Even after a new fan and clutch. I wish I knew a cure.

Rob
 
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Old 03-24-2019, 07:39 AM
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I also had a rattle sound and eventually traced it to loose nuts on the exhaust manifold to downpipe flanges. Most of it has gone, but I could not find a way to tighten one of the nuts properly without removing a bunch of other stuff.
 
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Old 03-24-2019, 07:44 AM
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Engine noises don't always come out right on videos, in my experience.

That said......

What MY ears are mostly hearing sounds like a pulley bearing rattling and grinding. Water pump, alternator.....

This is like having 6 people witness a crime and each sees something different

Cheers
DD
 

Last edited by Doug; 03-24-2019 at 09:29 AM. Reason: sp
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Old 03-24-2019, 09:22 AM
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Thanks for the suggestions everybody. I obviously hope it's the pulley rattle or something less critical like that. Will chase it down.

Cheers.

 
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Old 03-24-2019, 09:28 AM
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An $8 mechanics stethoscope might be very helpful

Cheers
DD
 
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Old 03-28-2019, 06:48 AM
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the metal splash guard under the radiator area and the metal heat shield over the manifolds is also known to rattle at certain rpm, aka as "sympatetic resonance".(something like that). I read somewhere that William Lyons and the engineers at Jaguar noticed this when the first XJ were built.
 
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Old 03-28-2019, 08:04 AM
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Any updates??
 
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Old 03-28-2019, 10:24 AM
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In my car, I note three things in that respect.

1. At times I get a ratte. It seems related to "how" the bonnet seats when closed. It "looks" right, buy may not be fully latched??

2. The valence under the radiator in my car is pretty hefty metal. So much so that I used it to fasten the lower part of the E fan shroud!!

3. The hanger for the left resonator was askew. I managed to lever it back n place...

Carl
 
 
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