01-12-2019, 09:41 PM | #1 |
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DIY F8X front wheel hub/bearing replacement
Disclaimer I am a highly trained individual, just not in auto repair. Exercise due diligence. Wear eye pro. Use jack stands. Practice safe sex. Etc.
Tools required Torque wrenches with specs ranging from 12nm to 140nm 17mm lug socket 5mm allen 10mm socket 18mm socket T-60 preferably impact rated First crack the lugs and get car on jack stands. Remove wheel. Wheel removal tool is your friend. Remove caliper with 18mm socket. Hang caliper, avoid kinks. Remove rotor by removing 2 circled bolts with 5mm Allen. Use lug bolt to prevent dropping rotor on foot Remove dustguard if desired with 10mm socket Remove 4 torx bolts attaching hub. Use a T-60 with breaker bar or impact Note tab on hub. This will locate at the bottom Mount new hub with NEW bolts. Torque to 120nm then tighten 90 degrees more. Mark your 90 degrees with a sharpie then tighten till your marks line up. Bolts are micro-encapsulated so no loctite required. Grab a beer and admire your work Remount dust guard with 10mm socket. Torque to 12nm. Mount rotor with 5mm Allen. Torque 2 Allen bolts to 16nm Remount caliper with 18mm bolts. I used blue loctite then torqued to 110nm Reinstall wheels and torque to 140nm Test drive and ensure nothing falls off. If anything departs the vehicle seek additional guidance. |
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01-20-2019, 04:28 PM | #3 |
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What was the reason for replacing the hub?
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01-21-2019, 12:14 PM | #5 |
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Bummer! Looks like one of the wrench monkeys didn't get the threads started well enough before blasting the lug bolts with an air-driven impact gun.
So did you have to replace the hub yourself? I can certainly understand if you didn't want them touching your car after that though.
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01-21-2019, 01:02 PM | #6 |
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Excellent write up and photos. No confusion and no unnecessary words.
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01-21-2019, 03:24 PM | #7 |
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01-21-2019, 03:58 PM | #8 |
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05-15-2019, 08:35 PM | #13 |
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Glad I found this... Thanks to getting new tires today looks like this project is in my immediate future.
At $252 did you buy the hub & bearing: https://www.getbmwparts.com/oem-part...bC1sNi1nYXM%3D Any reason you didn't just buy the hub? Also, which bolts did you buy? Do you have the PNs? |
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05-18-2019, 08:13 AM | #14 | |
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31-20-6-872-920 is the PN I used. |
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06-17-2019, 11:22 AM | #15 |
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08-05-2019, 03:39 PM | #16 | |
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Quote:
Seek additional guidance.
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08-09-2019, 03:19 PM | #17 | |
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Quote:
Rear bearings require a "special tool" which is just a hydraulic extractor required to pull hub off of axle |
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06-08-2021, 08:03 PM | #20 |
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Thanks much for this.
Though I believe the 4 bolts that fasten the hub are Torx PLUS (TP) 60's. A regular T60 might work but probably would fit somewhat loosely. |
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09-08-2021, 01:16 PM | #22 | |
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Quote:
Also, did you have to disconnect the forward control arm or suspension link ? It appears to be right in the way of one of the bolts. Tia ! |
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