Go to dieselgiant.com. Look under mercedes repair for the diy valve adjustment pictorial. That will give you an idea of what you're getting into. Looks pretty intimidating for a beginner, but it's not too tough. Toomany MBZ is right. The worst part is disassembling all the throttle linkage and what not to get the valve cover off...and then reassembling it when you're done. Personally, I think the valve adjusting wrenches make it A LOT easier, but they aren't too cheap.

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1983 MB 300SD Turbo Diesel