5 min removal of bearing race from crankshaft

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Davidsquaredson
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Main scooter: Early Eibar Jet 200
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Wed Mar 20, 2019 2:48 am

I put a brand new bearings in top end only to discover the crank was twisted. So I put the crank in the freezer for a day. Stood up crank in my vice. Ran around race with a small butane torch for 20 secs. Tapped the crack between race and crank with a fine chisel. Race moved. I repeated this 3 times, removing the race. I didn't have to use so much heat that it's hardness is compromised and will reuse it and it's bearing on the new crank. It was 5 mins of effort.

The chisel will leave marks in the crank. I could file them down if I wanted to try and fix it, but I'll just bin it.

Hope this helps someone.

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1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200

Norrie Bodge
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Wed Mar 20, 2019 9:13 am

Good Tip
I use one of these from Andy Francis

https://rover.ebay.com/rover/0/0/0?mpre ... 3344800683

Steveshipley
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Joined: Mon Apr 01, 2013 9:07 pm
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Wed Mar 20, 2019 9:24 am

I got an AF tool, but nothing short of surgery works on old cranks. good tip with the freezer tho 👍

Scooterdude
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Wed Mar 20, 2019 6:10 pm

Ive successfully removed stubborn tracks by welding an old hub bearing to the track and using my big puller to remove. However I recently did the welding trick but every time I tightened the puller it just broke bits off the track, tried 3 times but no cigar, in the end i had to resort to grinding it off.
One of my least favourite Lambretta jobs lol.

Muppet
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Main scooter: SX 150 running in

Wed Mar 20, 2019 6:35 pm

Norrie Bodge wrote:
Wed Mar 20, 2019 9:13 am
Good Tip
I use one of these from Andy Francis

https://rover.ebay.com/rover/0/0/0?mpre ... 3344800683
top tool its worked every time I've used it
im not a complete idiot
.
.
s me of the piec s are mis i g

hendy
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Main scooter: lambretta li 125
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Wed Mar 20, 2019 10:26 pm

I use this. Means I can use it for a load of other jobs besides.

https://rover.ebay.com/rover/0/0/0?mpre ... 2727795959

shamrockexpress
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Thu Mar 21, 2019 12:14 am

hendy wrote:
Wed Mar 20, 2019 10:26 pm
I use this. Means I can use it for a load of other jobs besides.

https://rover.ebay.com/rover/0/0/0?mpre ... 2727795959
thats the one..........never failed yet

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HxPaul
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Thu Mar 21, 2019 8:41 am

hendy wrote:
Wed Mar 20, 2019 10:26 pm
I use this. Means I can use it for a load of other jobs besides.

https://rover.ebay.com/rover/0/0/0?mpre ... 2727795959
I've got this tool and tried 3 times to get mag bearing track off,without success,in the end I had to resort to grinding it off.

hendy
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Joined: Mon Jul 07, 2014 10:34 am
Main scooter: lambretta li 125
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Thu Mar 21, 2019 10:57 am

HxPaul wrote:
Thu Mar 21, 2019 8:41 am
hendy wrote:
Wed Mar 20, 2019 10:26 pm
I use this. Means I can use it for a load of other jobs besides.

https://rover.ebay.com/rover/0/0/0?mpre ... 2727795959
I've got this tool and tried 3 times to get mag bearing track off,without success,in the end I had to resort to grinding it off.
Do you mean on 3 different cranks or 3 times on the same crank?

I can't imagine how it wouldn't work unless you're not using it right. Not trying to be a smart arse, I just can't understand how it wouldn't work.

Grumpy225
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Mon Mar 25, 2019 8:26 pm

Norrie Bodge wrote:
Wed Mar 20, 2019 9:13 am
Good Tip
I use one of these from Andy Francis

https://rover.ebay.com/rover/0/0/0?mpre ... 3344800683
Same here, no problems on any crankshaft. I think if it had a longer bolt the same tool could be used on SX and GP cranks.

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