LH crank keeps loosening

cougie
cougie Posts: 22,512
edited November 2011 in Workshop
Its one of the new fangled ones - BB30 ? Has been fine for a year or so, but now its slackening off after every ride or so.

I keep retightening it, but its loose by the end of the day. I wonder if the cranks thread is damaged now or would a hefty retightening and loctite work ?

I guess I'll look at the bike when I get home later.

Comments

  • rubbernekker
    rubbernekker Posts: 112
    What crank is it?
  • stigofthedump
    stigofthedump Posts: 331
    Most likely the splines have become worn because the bolt has come loose. Take them off and inspect. Any wear should be fairly obvious, look for shiney edges and/or grey dust.
    This happened to some cranks i had. The only answer was replacement sadly.
  • Monty Dog
    Monty Dog Posts: 20,614
    Depends on what model of crank as over-tightening could result in overloading the bearings. Certainly a Loctite like 641 bearing-fit might be a solution if the alternative is ditching them.
    Make mine an Italian, with Campagnolo on the side..

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