It has been at least ten years since I replaced a starter on a 123 diesel car (non-turbo engine in a wagon, OM617.912, car was 123.190).

Don't forget to disconnect the battery!!!

I did it all from below.

The two bolts holding the starter in place are the worst. You must really clean out the hex holes in order to make sure the hex bit goes all the way in.

I used a series of really long extensions, like two or three feet long, with a universal "flex" joint right before the hex bit socket, and a half-inch ratchet wrench, and I might have used a short cheater bar on the wrench handle. Lots of strength required, and then a loud "crack" and each bolt would come free.

Once you get all the bolts and wires holding the starter off, be prepared because the starter is heavy. You may need to move the steering left or right to create the opening that you can maneuver the starter out.

__________________
Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC