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      11-26-2021, 09:49 AM   #3
pigboy
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Drives: 116i F20
Join Date: Nov 2021
Location: Yorkshire

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I did this a little while back on my 116i and from a quick search on RealOEM it looks like it might be the same process/parts for you:

https://www.realoem.com/bmw/enUS/sho...diagId=11_5011

I don't have a guide as such, I just used the diagram on the realoem link to help find the pump location and part number for a replacement. Here are a few steps off the top of my head (assuming you've drained your coolant):
  • Disconnect air hoses and remove the airbox for easier access to the engine bay
  • Locate the water pump drive wheel (bottom left of the engine, see photos)
  • Remove the drive wheel from the pump by taking out the 3 screws (worth replacing this at the same time. I didn't and had to within 2 weeks)
  • Remove the 5 screws holding the waterpump in
  • Put the new waterpump in palce, add some threadlocker (I used medium strength) to the bolts and hand tighten (do not overtighten these bolts, they are quick to crossthread). Think I might've torqued to 10nm, but it's probably not needed
  • Put your (preferably new) drive wheel on the front of the pump - this is a bit of a pain but with some shoving and moving it gets there. You can then use a driver/pencil to line up the holes of the drive wheel with the holes on the pump
  • Put some threadlocker (again I used medium strength) on the drive wheel bolts and hand tighten. Again, they're a bit of a pain when it comes to crossthreading

Engine Bay:
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Engine Bay with airbox removed and waterpump drivewheel located:
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Waterpump drivewheel (you can see the cuts in the rubber on mine, which is why I had to replace it):
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Hope it helps!
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