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Old 03-14-2009, 01:58 PM   #1
Number6
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Question Front bearing/hub installation question

Hi folks,
I am working on replacing front hubs & bearings on my 1995 SL1. I have had the old pressed out and new Timkens pressed in by a machine shop. When I picked them up from the shop, I noticed that there is a bit of play in the bearings. Closer inspection shows the play is not between the bearings and the knuckles, but within the bearings themselves. I can grab the hub and hold the knuckle still, and move the hub up and down a little. As this is the first time I've done this job, I'm not sure if this is normal or not -- perhaps this play will disappear when the axle is bolted up and squeezes the bearing, but if this is dead wrong I don't necessarily want to go and attach everything just to take it apart again ...
Does anybody know?
Thanks.

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Old 03-14-2009, 04:47 PM   #2
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Default Re: Front bearing/hub installation question

Welcome to the Board.

When you install the axle/outer CV joint through the bearings and tighten the axle nut up there free play will go away.

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Old 03-19-2009, 02:27 AM   #3
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Default Re: Front bearing/hub installation question

Thank you, ssicarman, I found it to be just as you advised.

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Old 03-19-2009, 06:51 PM   #4
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Default Re: Front bearing/hub installation question

You're welcome.

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Old 03-19-2009, 09:15 PM   #5
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Default Re: Front bearing/hub installation question

Not to worry you, but I'm going to have to respectfully disagree with this analysis. Since the axle mounts inside the hub and the hub is a solid piece, no amount of tightening on the axle nut is going to have any effect on the bearing race at all. Rear wheel drive cars with inner and outer front wheel bearings, yes indeed, tightening the axle nut will draw them up. I installed my own bearing on the hub and knuckle recently and you have to be certain you only apply pressure to the race (inner or outer) you are installing.

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Old 03-19-2009, 10:15 PM   #6
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Default Re: Front bearing/hub installation question

When installed the hub is pressed into the inner races of the bearings. The outer race is one piece and the inner races are two separate pieces.

The hub is up against the inner race of the outer bearing. The axle (outer CV joint actually) is up against the inner race of the inner bearing. The hub does not come against the outer CV joint. There is space there.

So when the CV joint/axle nut is installed it pushes on the hub and pulls on the outer CV joint pulling the two pieces together causing them to compress the inner bearing races. This takes up any play.

I certainly agree that when you install the hub that you need to support the inner races while you press the hub in. If you don't you will ruin the entire bearing assembly.

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