- help removing crank from bottom bracket spindle
following on from my fascinating “what bottom bracket” thread from earlier, i have now encountered an obstacle.
I have had the chance to remove the old BB, but with a slight problem: the extractor threads in the left crank are slightly damaged (i don’t know how – they were not new and i have not noticed this before) on the outside, so my crank extractor won’t engage. there is still about 90% of the thread that would be “good”.
i now have a removed BB but with one crank still on the spindle. so i may yet be getting a new chainset to go with the new bottom bracket!
any suggestions on how to remove said crank would be much appreciated!Posted 7 years ago
i have tried the hammer technique but sadly am lacking a bench and vice so it proved fairly unsuccessful – i may need to persevere with it but the baby is now asleep so can’t right now!
(oh and they’re not really worth the expense, though i would much rather avoid having to fork out cash as i’m very skint right now!)Posted 7 years ago
1. no, isis.
2. yes definitely – the problem is there is visible damage to the thread going a mm or two in, meaning the extractor won’t bite at all to do its work.
3. i would rather preserve the crank, the BB’s for the bin anyway.
4. no can do – BB is no longer in the frame and is extra wrecked now from my efforts to detach it from crank!Posted 7 years agojamj1974Subscriber
Hold BB in vice and buy a new extractor (They often bite better…). Other than that an option I have seen used before is the installation of new self-extracting bolts (Again they often bite better.), and use an 8mm key to remove.
Have you tried lubricating the thread?Posted 7 years agobrakesMember
try rechasing the threads with a bradall/ stanley knife/ similar pointy but of metal so the tool will engage.Posted 7 years ago
or try a better BB extractor? Park Tools ones seems to extract cranks that have had their threads pulled out by lesser extractors.
I can lend you one if you like.projectMember
Apply heat to the crank arm with a hot air gun or better still, witha blow torch, best doen outside, heating aluminium allow makes a smell and sometimes fumes.
ALUMINIUM ALLOYS EXPAND FASTER THAN STEEL
REMEMBER IT WILL BE VERY HOT, SO USE THICK LEATHER GLOVES OR A HAMMER TO RELEASE THE CRANK.Posted 7 years ago
well i concluded the crank is dead, and as there was a virtually like for like brand new chainset and bottom bracket on ebay for very cheap i bit the bullet and went for that instead!
anyone want a right hand truvativ elita crank in used but good condition?! 😆
cheers for tips all, anyway. 🙂Posted 7 years ago
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