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Old 07-11-14, 04:11 PM   #1
rsg
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Crank Arm constantly comes loose - need a solution to solve problem.

My left crank arm constantly keep coming loose whenever I use my bike, how can I prevent this from happening??

What would be a cheap fix? (if any)

Please reply back.
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Old 07-11-14, 04:17 PM   #2
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New crank arm or crankset. Yours is toast.
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Old 07-11-14, 04:25 PM   #3
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I agree if the crank is coming lose from the spindle you need a new arm.
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Old 07-11-14, 04:51 PM   #4
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Take a look at the taper of that left-side crank arm. Does it look worn or widened? If so, it's a goner.
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Old 07-11-14, 04:54 PM   #5
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New arm....
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Old 07-11-14, 06:19 PM   #6
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Crankarm could be cracked at the hub and you're auguring for a rupture if it lets go completely while you're bearing down on the pedal.
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Old 07-11-14, 06:21 PM   #7
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+1 on the worn out crank arm..
It will take a gaggle of loose aluminumm crank arms before you can make the slightest "dents" on the tapers of a steel BB spindle......
But it still might be good to check that your crank arm bolts and spindle end threads are OK to make sure the are remaining tight when you ride.......

Last edited by Chombi; 07-11-14 at 06:26 PM.
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Old 07-11-14, 07:17 PM   #8
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have you tried another bolt and washer? i would try a few little things (even blue locktite) before you buy a new arm. but if the arm is a generic one, they can be had for $10. it's the left too (non photo side), so it's not nearly as important.
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Old 07-12-14, 01:57 AM   #9
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Yes it's the left arm that comes loose, just replaced the nut for it & was wondering if adding a washer or lock washer would help?

The spindle is good, the arm is slightly worn in the back side on one of the flats but the rest is ok. Even my bike shop looked at it said it should hold up.

Rode the bike yesterday, had the same problem after 45 minutes of riding after I installed the new nut to the arm.
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Old 07-12-14, 02:01 AM   #10
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Yes it's the left arm that comes loose, just replaced the nut for it & was wondering if adding a washer or lock washer would help?

The spindle is good, the arm is slightly worn in the back side on one of the flats but the rest is ok. Even my bike shop looked at it said it should hold up.

Rode the bike yesterday, had the same problem after 45 minutes of riding after I installed the new nut to the arm.
By the way the crank I have is a Sugino Model No. 5 FE-WB. 170 MM arm or 6-3/4" If I need a new arm, what would come close to this if I can't find the exact one? (have looked on E-bay, according to them, this model crank doesn't even exist)
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Old 07-12-14, 02:04 AM   #11
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By the way the crank I have is a Sugino Model No. 5 FE-WB. 170 MM arm or 6-3/4" If I need a new arm, what would come close to this if I can't find the exact one? (have looked on E-bay, according to them, this model crank doesn't even exist)
Does Sugino even make crank parts for older models?? Would like to keep my bike original if possible??
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Old 07-12-14, 05:19 AM   #12
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Post a pic. I bet just about everyone on this forum has at least one Sugino crankset floating around in their parts bin.
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Old 07-12-14, 05:34 AM   #13
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Does Sugino even make crank parts for older models?? Would like to keep my bike original if possible??
If there is a bike coop or a craigslist bike flipper near you, they can probably dig a crank up for $5 and a whole crank set for about $15. It doesn't get a whole lot cheaper than that.
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Old 07-12-14, 05:55 AM   #14
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Post a pic. I bet just about everyone on this forum has at least one Sugino crankset floating around in their parts bin.
+1
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Old 07-12-14, 06:37 AM   #15
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You won't easily find an exact replacement but you will be able to find a 170 mm Sugino crank that looks somewhat like your old crank. The cranks are on opposite sides of the bike so it's not like you ever see them facing you at the same time.
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Old 07-12-14, 07:28 AM   #16
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you replaced the nut? not the bolt? do you have one of those spindles that takes nuts and not bolts? i hate those.
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Old 07-12-14, 12:47 PM   #17
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you replaced the nut, not the bolt?

Do you have one of those spindles that takes nuts and not bolts?

Yes, mine uses a 14 mm nut to tighten the crank arm on.

Was wondering if adding a washer & lock washer could solve the problem??
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Old 07-12-14, 01:17 PM   #18
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Was wondering if adding a washer & lock washer could solve the problem??
Doubtful. You're hearing the voice of experience speaking from everyone who recommends replacement.
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Old 07-12-14, 01:25 PM   #19
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Do you know anyone who can do heliarc? Quick fix...
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Old 07-12-14, 02:21 PM   #20
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There ya go. Spend some quality time adding material with a welder, filing and checking the contact patch with Prussian blue, and you won't have to replace that $5 arm after all.
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Old 07-12-14, 02:39 PM   #21
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Pictures coming, as soon as I can get some Wi-Fi to transfer them off of my phone. (No Cell Service)
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Old 07-12-14, 04:00 PM   #22
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Do you know anyone who can do heliarc? Quick fix...
David,

The metal is stressed and HAS failed. Take the good advice offered and replace it. I wouldn't want you flying into the path of MY car when the arm breaks, I just washed it!

Marc
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Old 07-12-14, 04:31 PM   #23
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aren't those nuts kinda special, in that they have ridges on the inside face? they're not perfectly flat, so they kinda have some grip. i only had one bb like that and vaguely remember them.

there are several left arms on ebay delivered at the buy-it-now price of $14ish.
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Old 07-12-14, 07:44 PM   #24
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I know a few nuts that are kinda special, but they aren't the kind that you can adjust with a wrench from your toolbox.
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Old 07-13-14, 12:00 AM   #25
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^ these are different nuts that kinda grip. you don't grip these. they do that. self gripping nuts. very special, as far as nuts go. which isn't far. a few inches.
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