Rear wheel bearing fitting..right or wrong.. - Renault Forums :: Independent Renault forum

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post #1 of 8 (permalink) Old 31st August 2014 Thread Starter
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Question Rear wheel bearing fitting..right or wrong..

First watch this vid.. now how do you guys feel about fitting a bearing that's been in the freezer for 24 Hrs into a drum that's been in an oven for 20/30 me its disaster waiting to happen..I feel that a cold bearing against the hot drum would affect the molecular structure of the metal in the bearing and it could set micro fractures on the bearings casing and possible the the way with all the vids I have watched of late this guy actually used a torque wrench to tighten the hub nut up when garages did not..Tsk Tsk..

Now over to you guys ..

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post #2 of 8 (permalink) Old 31st August 2014
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Re: Rear wheel bearing fitting..right or wrong..

Talk about taking a sledge hammer to crack a walnut.

Using a cold chisel is definitely not a safe means of removing the bearing - there is high risk of either the chisel or bearing chipping and fragments flying all over the place. Oh then he has to use a welder when he could have used a decent punch or even an appropriate sizes socket to knock it out. What he did not reveal was that by using the welder in induced heat into the bearing thus helping free it from its housing.

If you look closely when he is using the torque wrench the nut doesn't move at all. In other words the nut was already torqued beyond it's limit.

The differential in temperatures of around 200 C between the drum and the bearing definitely runs the risk of inducing metal fatigue. Then of course any temper in the metal of the drum will have been affected by heating the drum in the oven - plus the risk of the drum being distorted out if shape.

For the price of a welder and the energy used in the oven he could have paid someone with a press 10 ten times over.

All I can say is "Glad he ain't working on my car"
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post #3 of 8 (permalink) Old 31st August 2014
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Re: Rear wheel bearing fitting..right or wrong..

Well gents, The official way to change a BMW motorcycle headstock bearing, which BTW has no space to use a press for removal is:-
Dremel with a thin blade grinder, the inner race to create a weak spot, smack smartly with a chisel, loud crack, bearing off.
New bearing in oven (max 200c). Headstock in freezer overnight, tap into position with tube, if you get it wrong, repeat, coz there's no other way to remove.
I for one can see nothing wrong in this, If BMW approve, why shouldn't we ? Surely brake drums & bearings are equal to great temperature changes. Having followed a car down the Welsh valleys last week with VERY SMELLY brakes, I guess the temperature attained must have been similar.

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post #4 of 8 (permalink) Old 31st August 2014
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Re: Rear wheel bearing fitting..right or wrong..

not watched the vid but a rear drum does get very hot in use so not much difference than putting in the oven
its the same as a ring gear you have to heat it up before fitting
only used once i bought a 6 ton press just for this sort of job it will see me out and hope the 50-60 i laid out pays for its self
as to youtube videos for repairs just because its not done the right way does not mean its not correct but from the post above a correct size socket would have been better than a chisel
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post #5 of 8 (permalink) Old 31st August 2014
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Re: Rear wheel bearing fitting..right or wrong..

hi when I fit a new piston to one of my mowers the gudgeon pin always goes in the freezer first slips straight in cheers
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