I don't know about what parts but when I removed one of the Studs that held the manifold on I found there is only 4 full threads holding it into the Cylinder head. That means you need take care not to over tighten the nuts.

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84 300D, 82 Volvo 244Gl Diesel

There are oil return pipe O-Rings that are easier to replace when the manifolds are off .

Two paper gaskets for the turbo oil inlet & outlet .

Maybe the boot at the bottom of the pipe ? .

Now's the time to slap on an non E.G.R. manifold combo.....

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better

I have an EGR block off plate that I installed a decade ago. Who knows whether it leaks or not. I should pull out my FLIR and turn on the car and see if heat is escaping.



I would be interested in knowning the oil return pip o-rings and paper gaskets and boot part numbers. If I may


Thanks

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Good to know. But usually that happens when the bolts are removed and then reinstalled. I don't think that's the case on my car.



I was actually thinking of replacing the bolts/studs with high quality steel replacements. I don't want to buy genuine Mercedes because who knows what the steel's quality is. Does anyone know of a brand and part number that I can just buy a replacement set of studs?



Also, the source of Mercedes recommends copper nuts. What would you say to that? Keep the factory nuts or replace with copper?

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four threads is not enough. You need a minimum of thread equal to the diameter of the bolt or stud to develop its full holding power. If you have one with four threads you need a new stud with the correct amount of threads holding it.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.