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Purchased Crankset with Damaged Threads. Now what?

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Purchased Crankset with Damaged Threads. Now what?

Old 04-21-10, 07:25 PM
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Purchased Crankset with Damaged Threads. Now what?

Dear BF, I'm looking for some advice:

I won a bid for an 2009 Ultegra SL 6601 crankset (w/o BB), for $110 shipped. Seller claims only 75 miles on the crank.

Upon receiving the crank, however, I noticed some stripping damage to the threads on the drive side arm, metal filings and all. I cleaned out the threads a bit with a rag, and then tried to skrew in the pedal.

The pedal engaged with the threads just fine, and went in straight, but I could not get it entirely in by hand (as i could with the non-stripped NDS arm), and it was not nearly as smooth as the NDS arm.

The money i saved in going used is enough to cover the new chain I need, but that's not worth it if this crank will give me trouble in the future.

What to do, what to do? Any ideas?

Thank you.
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Old 04-21-10, 07:30 PM
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try putting a wrench on it and see if it will go in, if it does its probably ok, if not, or if you feel you have been taken you could always file a claim with pay pal. Item not as described. I dont know if I would contact the seller first or not, I forget the recomended procedure.
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Old 04-21-10, 07:32 PM
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I'm inferring you purchased it off of ebay? If so, contact the seller. If the seller doesn't help you out, grab some info on ebay's buyer protection and see if they can help you out.
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Old 04-21-10, 07:34 PM
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can you get the threads chased?
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Old 04-21-10, 07:34 PM
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I would ask for a refund. I've had a strip crank arm thread... It's not very safe! My pedal just came off in the middle of an intersection. I almost completely lost my balance off the bike but just racked myself. It was a good thing I wasn't sprinting or standing up to pedal.
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Old 04-21-10, 07:37 PM
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try to get it replaced. if that fails then chase it with a pedal thread tap.
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Old 04-21-10, 08:24 PM
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If you have an old pedal moving around, take the axle out and use it to chase that again, it is easier with an axle to do it with an axle than with a hole pedal. How deep the pedals gets in? if it gets maybe 80% in you should not have a problem using that crank at all in my opinion. Use a lot of grease just in case.
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Old 04-21-10, 08:37 PM
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Thanks for the input, guys.

Yep, I should have specified that it was an ebay transaction. The ebay side of things, though, isn't the problem. I contacted the seller, and he quickly offered to take the crank back for a full refund if I am not satisfied.

The question is whether the good deal (er, low price, at least) is worth the risk of keeping it. Based on ptle's anecdote (ouch!) and ElJam's advice, looks like I may be better off sending it back. Hmm.

To respond to ls01- The pedal went in easily with the wrench.

Edit:: @ultraman, pedal goes in %80 or more by hand, %100 with the wrench.
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Old 04-21-10, 08:53 PM
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If the SL finish is intact then I'd keep it. No, the finish doesn't affect performance, but might as well be happy it looks good if you are going to keep it flawed.

On that note... I just bought a 6650 SL today - new for 140. Return that one. The guy also had the standard double.
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Old 04-22-10, 12:10 PM
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CyciumX - Thanks for your input. Can't find where you got that deal, but I'll be keeping an eye out At any rate, this thing is going back. Heading to the PO now.

Thank you all for your input.
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Old 04-22-10, 12:13 PM
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I had problems with a semi-stripped crank and took it to a LBS. He had a thread repair/re-thread type tool that fixed it right up.
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Old 04-22-10, 03:21 PM
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Try threading the pedal from the wrong side of the crank arm to chase the threads. I've had success with this method, granted the cranks were far from Ultegra level.
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Old 04-22-10, 08:58 PM
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So guys, I lied. I haven't yet sent it back, and heres why (just in case someone out there cares). I took it into the bike shop to ask for their advice. They offered to run a pedal tap through it, but admonished me to send it back. Now, with even more resolve, I headed to the post office. When I got there, i called the guy to let him know that I had made my decision to send the crank back to him.

I explained the situation, and told him about the pedal tap. He then offered to let me keep it for a while, get it tapped, and if that worked I could keep the crank and he will refund me $50 (1/2 of what I paid). Or, if I am still not satisfied, I can send it back for a full refund.

Needless to say, the prospect of owning an Ultegra SL crank with only 75 miles on it, for $50, is appealing to me. So, I'm gonna run the tap through, and decide from there. If it looks like it will safely secure my pedal, after the tap, I will likely keep the crank.
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Old 04-22-10, 09:03 PM
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Before you do any of that, get him to confirm the plan through eBay's messaging system. Just in case you do ultimately decide to return it, he won't really be able to refuse to refund your $$$ for using and/or altering the crank since you will have proof of his blessings to do so.

Just because he's being super cool about it now doesn't mean that he won't start being a $hithead when you try to get your money back.
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Old 04-22-10, 09:12 PM
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Originally Posted by MegaTom View Post
Before you do any of that, get him to confirm the plan through eBay's messaging system. Just in case you do ultimately decide to return it, he won't really be able to refuse to refund your $$$ for using and/or altering the crank since you will have proof of his blessings to do so.

Just because he's being super cool about it now doesn't mean that he won't start being a $hithead when you try to get your money back.
Good call.
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Old 04-22-10, 09:24 PM
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This is a bad situation because he might think he sold you a fine crank and that you stripped it. Just wrench it in there with some sort of glue (loctite?).. use the loctite that is meant to be undone, not the permanent stuff, it'll be fine, no way your pedal will just come out.
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Old 04-22-10, 11:04 PM
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What i think is that the threads were not bad at all.. 80% fine then use the wrench is ok. If the original owner used some kind of metalic glue like the one i have seen in some car bolts you shouldnt have a single problem. I take the bolt out and u see some metalic threads in it thinking the threads are all messed up. after cleaning really good the threads are ok.

Doubt you will have a problem with that crank ever. No way that pedal will out, hope you put some grease in the threads. Tight it well and enjoy the riding
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Old 04-23-10, 06:27 AM
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Originally Posted by deadly downtube View Post
This is a bad situation because he might think he sold you a fine crank and that you stripped it. Just wrench it in there with some sort of glue (loctite?).. use the loctite that is meant to be undone, not the permanent stuff, it'll be fine, no way your pedal will just come out.
That's the blue formula.
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Old 04-23-10, 09:01 AM
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Take it to a local machine shop and they might have thread tool that fits it and might be able repair the threads fairly easy.
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