Loose crank
- Thread starter Tin Pot
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MontyVeda
a short-tempered ill-controlled small-minded troll
- Location
- Lancaster... the little city.
is there/should there be a washer between the bolt & crank arm?
Had a similar problem some years ago with a Puch road bike. Right crank was loose, despite tightening. Realised that the owner had allowed the crank to gradually work loose due to not checking how tight the bolt was. Result being that the part of the crank that fitted over the end of the axle stub became gradually a bit bigger thus will never fit. Solution - new crank I'm afraid - ouch - !
gasinayr
Über Member
- Location
- Ayr Scotland
Use some tin foil on the bolt it will take up the slack between the face of the bolt and axle. If not new crank.
OP
OP
Tin Pot
Guru
Sorry, could upload the vid:
http://s170.photobucket.com/user/Tin_Pot/media/bike/EA94C740-7682-42A2-8C0C-9B020A289205.mp4.html
I gues the first step is to take it off?
I'm thinking the bearing might have "gone"...
http://s170.photobucket.com/user/Tin_Pot/media/bike/EA94C740-7682-42A2-8C0C-9B020A289205.mp4.html
I gues the first step is to take it off?
I'm thinking the bearing might have "gone"...
OP
OP
Tin Pot
Guru
I had it tightened a couple of months back, but I suppose I had noticed something a bit clunky, thought it was the pedal/spd tension was loose.
Been off the bike a week and it seems to be having a strop.
The crank is clearly moving, the mudguard just cracked in half, and the shifting is awful and slipping everywhere!
It's a miche team crankset, 3 years old. The only spare parts I don't have are the replacements for this because I was tempted on the Athena groupset.
So square taper then. Is it the left or right crank that's loose? (My money says the left)
The bearing hasn't "gone", if it's the crank that's moving on the axle. If the bolt is bottoming out, it might be that you've put the JIS taper Miche crank onto an ISO taper bottom bracket. This combination lets the crank sit farther inward on the bottom bracket spindle. A bit of fretting during use and suddenly the crank sits in too far. This is just a possibility though. Another answer is that the crank is banjaxed and you need a new one.
PS, I can't get your video to play.
D
Deleted member 1258
Guest
External BB. Looking at the video I'd say that either the crank is knackered, the spindle is knackered or both are knackered. You need to pull it apart to see whats going on.
Ah, got the video going now. Like the Little Diesel says, that looks like an external type BB. It's unclear how the crank is fixed to it, so (a) ignore most of what I said for now and (b) take that cap thing off and pull the crank off so we can see what's going on.
(although a bit of googling suggests you've got the crank bolt missing)
lpretro1
Guest
It looks like a self-extracting crank so to remove you undo the outer 'cap' a little bit then get a good allen key into the bolt behind and undo it against that 'cap'. Clean everything off and grease it thoroughly and refit and snug up to recommended torque - this sometimes does the trick - if not then you have a problem. It also looks a bit chewed up in there so take care 
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
Looks buggered.
cyberknight
As long as I breathe, I attack.
- Location
- Land of confusion
Never seen that in any tech docs but i concur .
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
A Manc tech doc of course !!
