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Originally Posted by sixto
Unless you can stop time wiring harness problems are inevitable. The problem stems from harness insualtion which degrades and leaves the wires susceptible to the ravages of heat. Some are lucky and never experience problems.
Check the archives for advice on the valvetrain. Some folks replace the squirters for good measure, some wait for a lifter to make noise. Some engines came with metal squirters that don't go bad. Maybe it's newer engines that came with plastic squirters that can crack. It's in the archives.
I remember someone saying to pass on any M119 with sludge in the valve cover. I forget the cause and why the consequences are irreversible.
Sixto
95 S420
87 300SDL
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My dad has had a couple of cases where the lifters won't stop knocking even after they've been replaced due to dirt and crap. I imagine cleaning out the sludge and running a solution e.g. marvel mystery oil through the engine at relatively high speeds for 60-100 miles would cure that problem.