Cosworth BOA question..

[CTE]

I do not know if anyone can help, but for the first time I can hear the timing chain ratling under the front cover, at idle, it goes quiet when the revs go above 1000 rpm or so.. I have read past posts saying beware of the timing chain tensioner, and if you hear bad noises from the front of the engine, best get it changed (the engine came from a good home with 89,000 miles, but I do not have any records as to when the tensioner was last replaced).....which seems like a pretty reasonable idea compared with changing the complete engine, no matter how cheap they may be. The engine has run sweatly for nearly 3 years now, although I have only done 15000 miles or so, and have changed oil etc correctly.
Does anyone have any advice on this....I read a post once where it described how to change the tensioner without having to strip the whole of the front of the engine? Does anyone know of a garage who can do this competantly? I have not got the time or the interest to do this myself. The engine is in a TVR S.

Thanks

Mark

[CTE]

No nothing that exotic....I mean the V6 lump from a Scorpio 24V Cosworth.

[CTE]

Thanks Mike, I`ll try the oil first. It is a while since it was last changed, but I have done relatively few miles. I take it the timing cover has to come off to get to the tensioner?