From all I've read, pulling the R4 clutch is not a job you want to do in situ on a W123. You need room for the puller and to get the puller threaded in, the R4 cannot have any rust on the shaft bolt. Good luck with that! I had my R4 on the bench and it was a very difficult job to pull the clutch because of rust.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked