I don't know about the 601's, but the 602 engine in my 190D 2.5 has a small "pocket" in the tensioner bracket that accepts a round rod (a long 3/8" drive socket extension works great). Put a rod in that "pocket", and use the rod as leverage to move the idler pulley, thus giving the slack that you needto remove the belt without cutting.

SteveM.

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner