Bearing removal

[Ichy]

There are a couple of bearing that I want to replace but I can't think of a non-destructive way of getting them out. The needle bearing is roughly 30mm x 25mm and the roller is about 30mm x 10mm.

https://i93.photobucket.com/albums/l41/marki_03/Gas%20Gas/PC240953Copy.jpg

https://i93.photobucket.com/albums/l41/marki_03/Gas%20Gas/PC240954Copy.jpg
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[Pete.]

Get the cases very hot and they will fall out. Have you priced the needle roller bearing before you pull it out? They can be quite expensive depending on size and how common they are.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Howling TerrorOutOfOffice]

Pete. Would you recommend degreasing then in the oven on 100 Celsius? Or wafting a blowtorch around the bearing?
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[Ichy]

Bearing are £5 for FAG. So no problem with the oven. It is what I've used in the past, just wondered if there was another option.

Pat. Degrease first. The voice of experience is very loud and persistent when it reminds me of the amount of smoke that filled the kitchen last time. I find 150c is better.
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[Pete.]

A tiny amount of oil will make an enormous amount of smoke. I would suggest thoroughly degreasing and then heating them (very carefully) on a gas barbeque or something similar. No way would I do it in a domestic over you'll fill the house with smoke and the stink will last forever.

I heated some casings over my portable gas fire to about 80 degrees and it took a good half an hour. I imagine an insulated box and a paint stripper gun would do a pretty good job.

I had a bearing go bad on an alloy wiresaw pulley out on site once, No way would it budge so I balanced the pulley over the exhaust of a large generator and the bearing fell out in a few minutes.

The might be removable by hydraulicing with heavy grease. You pack them full of grease right to the top, then get a close-fitting rod just in the hole and give it a good sharp thwack. The theory is that the grease cannot get out past the bearing quickly enough so the pressure pushes out the bearing. I've done it a few times and a few times have failed.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Ichy]

I like the barbecue idea.

I've used a paint stripper gun a few times with varied results.
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[thomp1983]

i you have a welder weld a nut to the bearing then using a bolt wound through the nut the bolt will push the bearing out

chris

[Raffles]

[Ariel Badger]

Differential coefficient of expansion is your friend, heat it up.
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[Ichy]

[stinkwheel]

You can buy a second hand electric oven for as little as £20.

Pretty sure I've seen them free to uplift on gumtree.

If I told you there was a special pulling tool for £20 you'd have it eh?

Just remember you need to use heavy cable (2sq mm minimum) and plug it into the cooker socket in the kitchen, unless you have a 30A socket in your garage.

Heat doesn't always work. I had my C90 crankcase in an oven at 200 for two hours and one like that never moved. Landed up drilling a hole through from the back. Punching it out, then filling in the hole with aluminium solder.
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[Ichy]

I've got more than 20 amps in the garage. Can't remember exactly but its dedicated supply that I think is either 60 or 80 amps for the welder and stuff.
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[stinkwheel]

[Kickstart]

Hi

If heat fails then something like this might do the job:-

https://www.machinemart.co.uk/shop/product/details/cht252-5-pce-blind-bearing-puller-set

All the best

Keith
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