Rear wheel bearing removal
Discussion
Well I've got around to replacing one of the wheel beariungs on the 350i. Problem is how to get the bearing shell out - I suppose I'll have to have it pressed out.
Does the man with the press need to press on the minute parts of the bearing shell visible in the cut-aways (see arrows)? Or can he just press against the remaining bearing and hope that the ball bearings cope with it?
Does the man with the press need to press on the minute parts of the bearing shell visible in the cut-aways (see arrows)? Or can he just press against the remaining bearing and hope that the ball bearings cope with it?
Yes. To both questions, though you may end up popping the inner race and balls out (ooer) if it's really worn. If you're lucky you can just drift it out with a punch through the cutaways. Try putting the hub carrier in the oven for an hour at 120 degrees first. Of course SWMBO will hate you for it, so don't mention my name.
It might come out easier if it's the fabricated hub carrier rather than the early cast alloy tyoe.
It might come out easier if it's the fabricated hub carrier rather than the early cast alloy tyoe.
I did give it a good whacking in the barn and also had a go with the vice (it's a big 'un, big egough to crush "Alien"'s head in ;^)
but it didn't budge. I might have a go with the oven but it's roast dinner day tomorrow so I'm sure we don't want greasy smells in it!
Of course the whole thng is too big for the oven so presumably you just leave the door ajar?
but it didn't budge. I might have a go with the oven but it's roast dinner day tomorrow so I'm sure we don't want greasy smells in it!
Of course the whole thng is too big for the oven so presumably you just leave the door ajar?
Violence sometimes works, but more often than not it'll need a press. About 10 tonnes should do it. I say that as thats the amount of force it took to remove an Audi A4 front wheel bearing, which is a similar size and a press fit.
If it still doesnt want to move, violence whilst under 10 tonnes is an option!
Ed.
If it still doesnt want to move, violence whilst under 10 tonnes is an option!
Ed.
Cool - I have some castrol LM handy.
Well the heat seemed to do the trick - I played a blowtortch on the hub carrier for abou 10 mins while pressing with the vice.
There was a 'ding' and the bearing shell moved a bit, and after about a half hour it was out resonably far so I used my "adjusting tool" (16lb sledgehammer) to knock it out the rest of the way.
However, disaster struck pressing the new bearing in, my indestructable vice went 'ding' and one of the jaws fell off! So it's in but needs another 15mm to finish it. Time for the professionals!
Well the heat seemed to do the trick - I played a blowtortch on the hub carrier for abou 10 mins while pressing with the vice.
There was a 'ding' and the bearing shell moved a bit, and after about a half hour it was out resonably far so I used my "adjusting tool" (16lb sledgehammer) to knock it out the rest of the way.
However, disaster struck pressing the new bearing in, my indestructable vice went 'ding' and one of the jaws fell off! So it's in but needs another 15mm to finish it. Time for the professionals!
I just got it back from my friendly engineer, he said it needed two people to work the fly press to get it fully in!
However they used the old bearing shell which has been turned so it doesn't stick in the 'ole. So if anyone else needs to do this job, let me know and I can lend out the old shell for the pressing-in part of it.
However they used the old bearing shell which has been turned so it doesn't stick in the 'ole. So if anyone else needs to do this job, let me know and I can lend out the old shell for the pressing-in part of it.
D'oh! Now the other side has gone (causing only my 3rd tow-truck call-out in 15 years of wedging). At least I have practice though.
At the angle the wheel is sitting I would guess that all the oil seals are trashed this time, luckily I found an extra one recently. I'm on the trail of extra seals in case anyone is interested.
At the angle the wheel is sitting I would guess that all the oil seals are trashed this time, luckily I found an extra one recently. I'm on the trail of extra seals in case anyone is interested.
adam quantrill said:
Well I've got around to replacing one of the wheel beariungs on the 350i. Problem is how to get the bearing shell out - I suppose I'll have to have it pressed out.
Does the man with the press need to press on the minute parts of the bearing shell visible in the cut-aways (see arrows)? Or can he just press against the remaining bearing and hope that the ball bearings cope with it?
I've made a tool that fits into the cut out's that you can then press against to help push them out. Still required 7 Ton to push it out and 8 ton to push it back in again.Does the man with the press need to press on the minute parts of the bearing shell visible in the cut-aways (see arrows)? Or can he just press against the remaining bearing and hope that the ball bearings cope with it?
Should you push them back in dry or use some kind of lube.
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