could somebody verify when the timing chain should be replaced on the 602 engine, i think some of my bad idle problems are from a worn chain or tensioner or both. there seems to be a clacking noise that comes & goes at regular intervals when the engine is at idle or higher rpm's "clacking intervals speed up with engine RPM.
as before the idle is very rough with # 5 cyl not firing until RPM is approx 1700.
There still seems to be a missfire " very intermitant " at the higher RPM. Cant see any air in the pre filter, no smoke, easy start's. this is a 1990 300D with 163,000 miles and full MB service history, i am thinking the owner sold due to being advised by the dealer it was time for some major cash to be spent on this vehicle!!!.
i have no problem doing the repairs but waht i do need is the chain link tool, this tool is over $450.00 from BENZ. Does anybody know where i can get same tool or tool that will do the job a little cheaper.

thanks very much