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I have not worked on a OM602 so I cannot comment.
1) I have removed the viscous fan on 300SDL, OM603 engine, with radiator in place. It was royal pain in the a$$ as there is little room to insert the allen key.
2) I have NOT removed the viscus fan on a W124, OM603 engine, with radiator in place. There seems to be even less room than the W126. I do not even want to go there. Has anyone done it successfully?
3) OM601 has ton of room as it is 2 cyl short.
What I am saying is that the design of the tensioner, shroud, limited space makes R&R the front of the engine components very difficult. Remove the radiator makes access better but it is messy with coolant and ATF connections. All in all, I do not think it was well thought out.
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