It has the 104 engine.

I wanted to clean the EGR tube.

I thought to remove the EGR is somewhat a easy job. Wrong!

After the two bolts that sit the EGR on the exhaust were removed, the big nut was loosen, I found it is impossible to seperate the EGR with the EGR tube apart.

There is some kind of coupler sitting in between which I can't figure out. Can anybody give me some directions?

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11 S550
09 C300
91 560SEL
90 300CE
84 380SE
83 240D