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5 min removal of bearing race from crankshaft

Posted: Wed Mar 20, 2019 2:48 am
by Davidsquaredson
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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Re: 5 min removal of bearing race from crankshaft

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

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

Re: 5 min removal of bearing race from crankshaft

Posted: Wed Mar 20, 2019 9:24 am
by Steveshipley
I got an AF tool, but nothing short of surgery works on old cranks. good tip with the freezer tho 👍

Re: 5 min removal of bearing race from crankshaft

Posted: Wed Mar 20, 2019 6:10 pm
by Scooterdude
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.

Re: 5 min removal of bearing race from crankshaft

Posted: Wed Mar 20, 2019 6:35 pm
by Muppet
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

Re: 5 min removal of bearing race from crankshaft

Posted: Wed Mar 20, 2019 10:26 pm
by hendy
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

Re: 5 min removal of bearing race from crankshaft

Posted: Thu Mar 21, 2019 12:14 am
by shamrockexpress
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

Re: 5 min removal of bearing race from crankshaft

Posted: Thu Mar 21, 2019 8:41 am
by HxPaul
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.

Re: 5 min removal of bearing race from crankshaft

Posted: Thu Mar 21, 2019 10:57 am
by hendy
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.

Re: 5 min removal of bearing race from crankshaft

Posted: Mon Mar 25, 2019 8:26 pm
by Grumpy225
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.