Is the drive belt still fitted? If so draw a diagram of all the pulleys connect the pulleys in your piccy with lines as per your belt run on the engine.There may be an automatic tensioner you will require a tool to operate this You should be able to replace the belt now. Hope this is helpful.
SOURCE: diagram for serpentine belt for 2002 BMW 525i
An image of a serpentine belt, hope this will help you,
Eitan.
SOURCE: 97 BMW 528I NEED DRIVE BELT DIAGRAM
My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.
I do not know if you still need this information, but I am going ahead and answering it anyway. You may want to Print the Diagrams for future use.
CLICK on the following LINK. It has the Belt Diagrams you will need.
If you would: Before Clicking: Let me know if this helped you, or if you have any additional information or questions. Feel Free to contact me at FixYa.com!
Again my apologies...
http://www.2carpros.com/car_repair_information/year/1997/make/bmw/model/528i/1997_bmw_528i_drive_belt_routing_diagram.htm
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