Quote:
Originally Posted by thinfilmboy
Also, On YouTube a technician says you never want to take one of these heads off, since it's difficult to replace without having head gasket leaks. Do you know if that is actually true?
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It depends.
I've taken the head off a 606 successfully twice now. But I spent many hundreds of dollars on all the correct special tools, and the MB factory service manual. My workspace was kept surgically clean, and I followed the factory manual to the letter. All one-time-use parts were replaced, and all new parts were Genuine MB. Full success, no leaks. The parts cost alone was a few hundred dollars for all the bolts, gaskets, etc.
If you take short cuts, try to "wing it" without the factory manual, guess at the torque specs, reuse one-time-use fasteners, and use generic parts from Auto zone, then yes it will probably leak.
With all of that said, removing the head on a 606 is a *lot* of work, it's by far the longest most complicated head removal job of any engine I've worked on. I would avoid doing it unless absolutely necessary.
Quote:
Originally Posted by oilslick
I concur with those advocating the use of a vacuum. Make some type of reducer for the hose and attach a length of SMALL rubber automotive vacuum hose.
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^ This, exactly. Reduce the vacuum to something the size of a drinking straw, and go in via the glow plug hole. If something is in there, this will get it. You can also use a borescope into the glow plug hole first to inspect and locate the foreign object.