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Originally Posted by rwthomas1
Having owned 3 other turbo vehicles the MB drain tube is the worst design I have seen yet. I did the seals when I had the head off my 617 but it still wasn't easy. I don't think the lower tube seated correctly as the grommet was very difficult to seat. It doesn't leak so I am not concerned. I just wonder why MB made such a simple piece so complex. All the other vehicles I have worked on just had a short section of rubber hose to connect the turbo drain to a boss or fitting on the block. Simple, effective, easy to service and cheap. RT
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I'm guessing, but 1. To control interchangeability and reliability, they chose to have several different versions of upper oil pans rather than mess with that wonderful block. 2. Using thin wall steel tubing, they could achieve a significant thermal gradient as the oil leaves the turbine housing. 3. They knew that a rubber hose would get really hot/hard close to the turbine, and maybe they wanted metal all the way down, just to be sure.
Still, why didn't they make it one piece with 1 simple, hi-temp seal on the bottom? I'm certainly with you there.