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Aagghhh, what am I doing wrong!!
Markymark - 19/7/18 at 06:39 PM

OK guys I need your help!

So I'm fitting the wheel bearings into my Sierra rear hubs, tapped the outer races in so they sit flush on the lip, bearings greased up, seals in, push in the front flange, tap in the shaft (lobro type), tighten the nut, so far so good.

When I tighten the nut up the bearing goes pretty much solid, just about turnable by hand at 150NM, that can't be right can it? I'm sure they are supposed to be 250Nm??

What am I missing, I've stripped it down twice, inspected and refitted, I can't see anything wrong, they just seem far too tight!

Any help is as always greatly appreciated

Mark

adithorp - 19/7/18 at 07:09 PM

The outer races should go in as far as possible not just flush.

ReMan - 19/7/18 at 07:14 PM

Wot he said.."...

rusty nuts - 19/7/18 at 07:54 PM

As already stated you need to fit the bearings into the housing as far as they will go, even then you may find they are initially tight after tightening the hub nut

Markymark - 19/7/18 at 09:29 PM

Thanks for the replies, sorry I meant, right down as far as they would go until they are hard against the central ridge, I didn't make that very clear

So keep the answers coming

Mark

hkp57 - 20/7/18 at 03:05 AM

I had same issue they feel really tight but trust the numbers, build it up set the torque to 310 to 350 Nm or 229 to 250 lbf / ft

They will feel tight as hell by hand but by the time you have a wheel on and they free off quick.

Failure to achieve these torque figures will result in the nut backing off, I had it happen on track and it pushed the pads back in resulting in no brakes at the next big stop.


Description
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[Edited on 20/7/18 by hkp57]

CosKev3 - 20/7/18 at 07:03 AM

As above,They are really tight to turn with new bearings trying to turn the hub by hand.

Once a wheel is on,or use a bar between the studs they will turn

Markymark - 20/7/18 at 10:23 AM

Thanks guys

So it turns out I'm not doing anything wrong!!!

I just can't believe how tight they are.

Mark

jps - 20/7/18 at 11:10 AM

quote:
Originally posted by Markymark
Thanks for the replies, sorry I meant, right down as far as they would go until they are hard against the central ridge, I didn't make that very clear

So keep the answers coming

Mark


How did you drift them in? I have a packet of new bearings ready to fit once i've given the carriers a final coat of paint. Was considering taking them down to the local garage to fit though.

Markymark - 20/7/18 at 12:10 PM

Found a thick flat disc of metal and tapped that to start with then used a punch to tap them right home. You just need something to start them off squarely. Hope that helps.

Mark