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Re: Front Wheel Bearings - Face Adjusted
Posted: Thu Apr 11, 2019 5:47 pm
by ampwhu
which way around the these bearings go? ive never done them and often wondered. any pictures?
Re: Front Wheel Bearings - Face Adjusted
Posted: Fri Apr 12, 2019 8:03 am
by Declan_Burns
When it comes to bearings I would use 7205BECBM and not 7205BECBP. The difference is in the cage. The "M" is a metal cage and the "P" is polyamide. The metal cage bearings are a bit more expensive.
Regards
Declan
Re: Front Wheel Bearings - Face Adjusted
Posted: Fri Apr 12, 2019 7:49 pm
by IslipMinor
ampwhu,
The attached drawing shows the correct way to fit the front wheel bearings. The word 'THRUST' should be stamped on to one side of each of the bearings, and the original BMC fitting instructions say that this must face the spacer. I am not sure that it is always the case with today's bearings, even with the major suppliers like SKF. Irrespective of that the correct way round is in the diagram below:
- Front Hub Bearings v2.JPG (30.67 KiB) Viewed 905 times
Once the hub is refitted, there should be no 'rock' of the hub, even with the wheel fitted. The bearings are 'pre-loaded' as part of the original design, but differing bearing quality/tolerances and wear to the hub can result in movement, no matter how much the hub nut is tightened.
The oil seal is fitted with its 'open' side towards the inner bearing (it usually has the spring visible this side as well).