Dont know what your trying to get to but its not a water pump following link shows your pump if your car was manufactured before 3/90 the small electric one /auxiliary was for heat
1990 BMW 525i Water Pump and this link are vidoes that show where and how to remove a water pump
90 525i water pump Yahoo Video Search Results
STOP what you are doing before you damage something!! Whatever you are trying to remove is not the water pump. Neither the sparkplugs nor the "timing belt" cover needs to come off. Remove the fan belt. Remove the fan (the nut is LH thread- means it turns left to tighten and right to loosen). You will need a large wrench (32mm) availible at sears.The water pump is directly behind the fan and is held in by 4 10mm bolts.
SOURCE: diagram for serpentine belt for 2002 BMW 525i
An image of a serpentine belt, hope this will help you,
Eitan.
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