Im in the middle of doing a head gasket on my 89 300e 3.0l & was wondering if I should replace my timing chain,gears & slides.Is there something I should look for?I know my one slider has to be replaced since its cracking,God forbid a piece of it breaks off.It has 130,000 miles.I also noticed a kind of crackling noise while idling,maybe the chain????Thanks guys this is the first Mercedes I have owned.Thanks again,
Frank