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Message: <blockquote data-quote="2wenty6" data-source="post: 460836" data-attributes="member: 20205">You don't generally replace the timing chain unless you're planning a top overhaul. At 170k km the timing chain should still be in running condition. Unlike timing belts, timing chains will not snap and destroy your engine - the only concern is that it will elongate over time and mess up the timing a little that is all.Belts and waterpump replacement are simple jobs I think you can refer to the sticky thread with prices for e36 parts and service. There really is nothing 'while-in-there' to do when you're replacing belts and waterpump, they're all easily accessible.If you still feel like changing the timing belt, then consider checking the condition of the vanos unit, primary and secondary tensioners, replace as needed. Also while in there, consider replacing headgasket and valve cover gasket. But to me, these won't be lumped under preventative maintenance - I only took care of these when I blew my headgasket.</blockquote>