> My 1994 525i has about 145,000 miles on it and it has a noisy timing
> chain. It is noisy when hot and cold. I have read on here that it
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> parts to get replaced so that I don't have to go back in there and pay
> labor again to fix something right next to the timing chain area?
I did one on an M42 318iS years ago. Car had been run for too long with
a worn ternsioner. I had to to the sprockets, guide rails, tensioner and
chain. Parts cost around 250 GBP and it took me a whole day.
I'd try a new tensioner first. You'll need to buy one anyway and it's
simple to fit.

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