[xk8] engine rattle

I posted earler about engine rattle on cold start. I left it at the
dealership for 4 days. No rattle on cold start. Left it set in the
garage for 9 days. I had the service writer with me and again no
rattle. It was sugested by the service writer to go to a synthetic
oil. I replied that that was not getting to the base of the
problem. Their reply was that is was worth a try.

Car just went out of warrenty in June with 20,000 mi. Is a
synthetic oil the answer? If so what kind of synthetic oil would be
best to use and what kind of weight. I have never used a synthetic
oil befor. The xk8 had 16000 mi. when I bought it so I donot have a
history of how often the oil was changed. I change my oil every
3000 mi.

Thank You
Jan–
jan heintz
rockford illinois, United States
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In reply to a message from jan heintz sent Fri 5 Sep 2003:

Jan,

A hybrid synthetic is best according to experieces here. You should
search the archives for the forum and you will find several long
discussions about synthetic oil. Too much to go back over here.

Richard Liggitt–
'70 E Roadster, '98 XK8 Roadster, '02 Mini Cooper
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Hi guys,

I have a small rattle at about 2,500 RPM when starting the
engine from cold, which goes away when warm.

I had the timing chain tensioners done 1,000 miles ago, and
a new full exhaust fitted 500 miles ago.

Am I right in assuming that if it was the timing chain
tensioners, I’d get the rattle at idle when cold; not just
at a specific engine speed?

What could the reason for this noise possibly be?

It seemed to start after the exhaust was fitted, but I’m not
sure!–
Space1999
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In reply to a message from Space1999 sent Sat 6 Feb 2010:

Go to this location and it has 2 videos and see if this is
what you are hearing.
http://www.gusglikas.com/AutoRepairBeltTensioner.htm--
GusG
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In reply to a message from GusG sent Sat 6 Feb 2010:

thanks for the speedy reply; the noise isn’t like this - it
sounds like a camchain rattling, or exhaust manifold vibe, or
somesuch, but only at a specific RPM. So I was wondering if
anyone’s heard the camchain rattle on an XK8 (I haven’t, I
think!) and if so whether they can tell me if it’s constant
at most RPMs when cold…?–
Space1999
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In reply to a message from Space1999 sent Sat 6 Feb 2010:

You could get a mechanics stethoscope and locate the sound.
Chain rattling in nothing to mess around with it could
become a bigger problem.–
GusG
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In reply to a message from Space1999 sent Sat 6 Feb 2010:

This may be related to the variable valve timing units on the
intake cams as they are activated at specific rpms. If you are not
used to dealing with them, you may want to get a mechanic to look
at them.–
Brian Caro 05 XJ8 4.2, 06 XKR 4.2
Newport News, VA, United States
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