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  #1  
Old 04-08-2008, 11:06 AM
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W126 Front wheel bearing replace

i had to replace my front wheel bearings on ny 91 300SE. The manual calls for 2mm preload. This seems too much, it's almost a tenth of an inch(.080). Maybe they mean 0.2mm? I'm tempted to tighten them up then back off a little instead. With the 2 mm, I can shake the wheel and see the movement and hear clicking of the bearings? Is that correct??

Also, I think I did something stupid. I used the old outer raceway on the inner bearing as it looked to be in good shape, but I just read where I should not have done that. It looked like it would be a bear to get out without the proper puller. At this point, it's all back together and I'll see what happens. The bearings are not that expensive, I bought Timken's from ********, for about $7.00 each.

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  #2  
Old 04-08-2008, 11:08 AM
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Do you haqve the tools to measure the preload? I've always just tightened the collar nut while turning the wheel, until I start to feel friction on the wheel. Then back off 1/4 turn (I think this is the procedure from the Haynes manual). I've never had a problem just doing it this way.
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Old 04-08-2008, 12:39 PM
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In the W123 maintenance library - probably the same for the W126 wheel bearings - it says to tighten the nut and then back off 1/3 turn. There is no measurement involved. I too left the rear race in place over 5 years ago w/o problems to date.
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Old 04-09-2008, 12:39 AM
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Thanks guys. i do have a dial gauge to measure the movement, however, 2mm of movement of the rotor in and out seems too loose. I tightened it until there was no movement and backed off 1/3 turn. I'll let you know if the bearings fall apart! The problem is that i think maybe you can wreck the cages if you tighten too much before backing off.
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Old 04-09-2008, 02:19 AM
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One thing I should have mentioned: only reuse the rear bearing race if the existing races have no blue burn marks & if there are no indentations from the bearing rollers.
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Old 04-09-2008, 09:28 PM
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If I am going to replace wheel bearings.. replaces races as well.. not much cost.. not all that much time to get them out...Better to have all new..
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  #7  
Old 04-10-2008, 08:51 AM
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Running on the old races is a sure fire way to prematurely wear out your new bearings. I've replaced quite a few bearings Very early in their lift after the PO/PM decided the old races looked fine...

Jonathan

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