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      11-11-2023, 09:22 PM   #1
awdowns
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Water pump pulley grooved vs smooth

New N63 owner here and I am changing the water pump on my 2011 X5 50i.

The pump I removed from the vehicle has a grooved pulley. The replacement I ordered from FCP Euro has a smooth pulley. Every replacement pump picture I have seen online has a smooth pulley including the drawing on RealOEM.

The way the belt was routed has the grooved side riding on the smooth water pump pulley. I've never seen a routing that has the grooved side of a belt riding on a smooth pulley before.

Can someone confirm if this is correct / normal?
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      11-12-2023, 01:06 PM   #2
jbash87
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Looks like a part number change from a 11517548264 to a 263 (superseded part is the 264 for some reason). If you google image search the 264 you can see grooves. The newer 263 doesn't have them.
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      11-12-2023, 03:18 PM   #3
tomjonesBT33
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Correct, the new pumps do not have grooved pulleys. I replaced mine last year and the original and replacement both have smooth pulleys. Both are/were original BMW parts. I’ve never seen this before either, but that’s how they are.
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      11-13-2023, 08:17 AM   #4
awdowns
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Thank you guys for confirming.

This really had me scratching my head. I had never seen this before.


11517548264 does return images of a grooved pulley. Interesting they chose to do that. The grooved pulley pump I pulled off had "Gates 43015" stamped on the pulley and even a google search for that one comes back with images of a smooth pulley now.
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