Hi

I discover that my 250SL (late) with engine nº003505 has a Bosch injection pump PES 6KL 70A120 R20 and not the PES 6KL 70A120 R18Z (or R18Y).

1- Should I remove the R20 and change it to a R18Z ?
2- What are the diferences?
3- Is it possible to adjust (convert) one R20 to work as R18Z ?


The R20 was the pump for the 280SE a different engine.

Many thanks
Sérgio