[ROVERNET - UK] 2000 TC rattle

[fjcumberland at sc.rr.com]

Hi Eric,

Thanks!  |I think my engine is from a S1 car, but rebuilt with a higher
compression ratio (need to look that up . . . .).   I'll see whether the
tensioner is adjustable.  Thanks also for the tip about the plug lips
breaking - it is good that I won't be surprised if it happens.  I think
I have a spare NOS plug it breaks.  I hope I don't have to pull the head
- at the rate my car projects get done it will be around the time of our
next presidential election . . .  
Cheers,

Jim
----- Original Message -----
From: Eric Russell <p6rovers at yahoo.com>
Date: Tuesday, October 11, 2005 11:54 am
Subject: Re: [ROVERNET - UK] 2000 TC rattle

> Jim,
> The noise you describe sounds like the timing chain. I
> don't know what version of upper timing chain
> tensioner you have but the original version was
> adjustable with an Allen key. The tensioner was
> installed with the pad close to the body.  When the
> tensioner was correctly in position, one inserted the
> Allen key and turned it to release the pad to push
> toward the chain when needed.  One cause of rattle was
> that the installer forgot to turn the Allen key
> adjustment so the pad was retained against the body of
> the tensioner.  If that is your case, you could expect
> an improvement by turning the Allen key adjustment.
> 
> The later tensioners are often those used on other
> vehicles (MGB I think) and had no adjustment.  A
> person tied the pad with some thread and cut the
> thread after everything was in place.
> 
> Access to the upper tensioner is through the large
> aluminum plug opposite the tensioner.  However, with
> time and heat, the rubber sealing ring becomes hard. 
> When a person tries to pry out the aluminum plug, the
> lips of the plug usually get snapped off.  On
> occasion, I have used a propane torch to destroy the
> rubber ring providing you can get a new replacement to
> refit the plug, later.
> 
> The worst case scenario is the need to remove the head
> to replace the upper chain with a new one.  Ruth at
> All British Cars can help you source a new chain.  I
> don't know if she has OEM tensioners or not.
> 
> Eric
> --- fjcumberland at sc.rr.com wrote:
> 
> > Hi all,
> > 
> > Sort of a "newbie" question here.  My '71 2000 TC,
> > which has about 6K
> > miles on the engine (my best guess) has developed a
> > metallic rattling
> > noise that appears to be in the vicinity of the
> > timing chain (as much as
> > one can tell from where engine noises come . . . .).
> >  The rattle is most
> > noticable at idle, but as far as I can tell it goes
> > away at speed or
> > under load.  The car needs a tune-up - it has a
> > rough idle and seems to
> > have a miss when I drive with foot off the
> > accelerator.  It's also
> > running rich.  Is it worth my checking at least the
> > upper tensioner?  Is
> > it possible to tighten the tensioner, or must I
> > replace it?
> > 
> > 
> > Also - am hoping one day soon to replace the deDion
> > boot using Alan's
> > method - will report back on results.  It sounds a
> > lot easier than
> > yanking the entire rear end . . .
> > 
> > Thanks in advance for any help!
> > 
> > Cheers,
> > 
> > Jim
> > 
> > 
> > 
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> 
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