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It is the intake manifold. It is under vacuum, not pressure. Take the manifold off. Do what you need to do and put the manifold back on. Drive the car. You don't need all the bolts. Don't over tighten. The threads are in aluminum and strip easy.
My '96 E300D, by the time it had 300k+miles, had at least 2 intake bolt holes that were stripped and barely held the bolts in place and applied almost no pressure to securing the manifold to the head. If it makes you feel better us a gasket sealant of some sort, but I wouldn't bother.
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Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO
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