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        General >> Give/Need advice to/from others >> New wheel bearing
        
(Message started by: Jonnycab on May 25^th, 2009, 1:09am)

Title: New wheel bearing
Post by Jonnycab on May 25^th, 2009, 1:09am

Not sure if this is a probelm or not, but some advice would be appreciated :)

Fitted a new R/O/S wheel bearing yesterday & it seems to be get quite warm ???....Is this normal ?....Is it maybe bedding in ? :-/. The N/S hub doesn't seem to get as warm.

I've done this job a couple of times before, but never really checked the hub for heat. Used plenty of grease on the new bearing & it's all torqued up nice & tight, so can't see why it would be getting this warm :-/

Title: Re: New wheel bearing
Post by wojtekor on May 25^th, 2009, 1:14am

quite warm meaning...? i don't think it should get noticeably warm...

Title: Re: New wheel bearing
Post by Jonnycab on May 25^th, 2009, 1:33am

The wheel doesn't feel particularly warm, it's only when you remove the wheel centre & feel the actual hub nut. It's quite hot, but not too hot that you can't keep your hand on it :)

This is starting to worry me now, I can't think I've done anything wrong, but can't understand why it would be warming up like this :-/

Title: Re: New wheel bearing
Post by Tompion on May 25^th, 2009, 4:09am

They definitely don’t bed in. Unlike tapered bearings on older cars where there was a bit of play, these are made to precise tolerances with no play or even a slight preload. The slightest nick preventing the cups going home or other problems causing misalignment can result in an excessive preload causing overheating/premature failure.
Did you push the seals right in to the shoulder, mine hadn’t been pushed home which resulted in them rubbing too hard on the hub, you could see they had got hot.

Title: Re: New wheel bearing
Post by tlundkvi on May 25^th, 2009, 10:29am

on 05/25/09 at 01:33:46, Jonnycab wrote:

Had a Golf once where the rear bearings were bad/badly installed, resulting in a premature failure at 30km. This heated up the wheel so you could see your spit evaporate in a second. Is the heat coming from the hub nut or are the brake discs also hot? (changed a bearing myself last week and makes me want to doublecheck my own too).

But I felt mine a day after changing, and couldn't notice any difference in heat between the other side and the side I changed. Did you compare them too?

Title: Re: New wheel bearing
Post by Jonnycab on May 25^th, 2009, 1:05pm

The seals are pressed right in, so I don't think it's them rubbing on the hub. But come to think of it, I did ever so slightly nick the centre of the carrier when bashing out the old cups. The new cups looked like they went in nicely, but maybe they didn't & they are ever so slightly off :-/

Title: Re: New wheel bearing
Post by Tompion on May 25^th, 2009, 1:55pm

on 05/12/09 at 20:06:11, Tompion wrote:

I find the best way to check is to remove the calliper & disc, unbolt the carrier but leave the centre nut tight. You can pull the carrier out far enough to revolve it around the drive shaft. That way you’re just turning the bearing not the diff – any clicking or roughness the bearings need changing.

Dave

I would recommend the method I gave for checking your bearing in another thread. It will leave the bearings fully torqued up. Slowly turn the hub several times back and forth you should feel any problem (fix the disc shield out of the way or you’ll feel that catching). It should feel very smooth but a little stiff due to the seals and grease.

The cups on mine had been very badly fitted, there were several nicks preventing them seating properly & they had been driven in with a pin punch – you could see damage/flaking radiating from the marks left by the punch.

Some interesting stuff on bearing failure here – although it appears to be about ball races, I expect much of it is relevant to roller races:
http://www.tribology.co.uk/services/investigate/r_bearing.htm

Title: Re: New wheel bearing
Post by Jonnycab on May 26^th, 2009, 4:05pm

Tompion...I tried your method & there are no tight spots or roughness/clicking etc, it feels silky smooth ;)

This is going to sound a bit mad, but after a couple of days driving around the bearing doesn't seem to be getting as warm anymore ???

For the moment I've left both rear wheel centres off so I can check & compare the two sides every so often & will keep an ear out for any squeaks etc :)

Title: Re: New wheel bearing
Post by Tompion on May 26^th, 2009, 7:22pm

Sounds good, hopefully just the pads dragging a bit after the work. :)
Of course it is one of the down sides of the site, you worry more than perhaps you should about known problems – any other car you’d probably follow what it says in the Haynes manual & forget about it.

Title: Re: New wheel bearing
Post by Jonnycab on May 27^th, 2009, 12:40am

Agreed dave, I think the condition is called 'Scorpio hypochondria' ;D....but I still think it's a little warmer than it should be ::)

I'm wondering whether I should have replaced the hub as well ?.... It wasn't perfect but looked good enough to reuse,...maybe it wasn't :-/