Author Topic: Tighten up the chain and now Bottom Bracket clicking on Mercury  (Read 308 times)

aggs

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I have just moved the eccentric bottom bracket to take some slack out of the chain.
On yesterdays ride it clicked occasionally.
On todays it is clicking every rotation of cranks.
It could be a coincidence and bottom bracket worn, but it seems the change in position has caused the problem.
Any advice please?
Thanks

pavel

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Re: Tighten up the chain and now Bottom Bracket clicking on Mercury
« Reply #1 on: June 15, 2017, 03:07:26 PM »
going by an earlier thread, it seems that it is possible that reversing a chain or using one that is stretched to a state of wear could cause the clicking.  I always check the bottom bracket as the culprit first to make sure it has not backed out a bit but someone else here on the forum accidentally reversed the chain, and that was the culprit.

julk

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Re: Tighten up the chain and now Bottom Bracket clicking on Mercury
« Reply #2 on: June 15, 2017, 05:49:28 PM »
I had a similar noise recently, the eccentric bolts had loosened very slightly.
Worth checking your bolts are now tightened to the correct torque.
Julian.


Danneaux

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Re: Tighten up the chain and now Bottom Bracket clicking on Mercury
« Reply #3 on: June 15, 2017, 05:55:00 PM »
If it has been awhile since the previous adjustment, it can help to grease the eccentric before reinserting. Not only reduces the chances of galling, but reduces the possibility of it shifting just enough to produce an audible click.  Yes, check the bolts for proper torque.

Best,

Dan.

aggs

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Re: Tighten up the chain and now Bottom Bracket clicking on Mercury
« Reply #4 on: June 15, 2017, 09:35:22 PM »
Will apply some lubricant and see what difference it makes.
Any one got tips on moving the eccentric easily.
I used a allen key in the hole and a tap with a hammer.
Not the best way and easy to chip paint on the frame.
The special tool was not able to move it!

mickeg

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Re: Tighten up the chain and now Bottom Bracket clicking on Mercury
« Reply #5 on: June 16, 2017, 02:45:15 AM »
My knowledge of the eccentrics is limited to the Nomad Mk II, not Mercury.  But, when I loosen the bolts that hold the eccentric in position on my Nomad, the eccentric is very loose.  With just light finger pressure I can move the eccentric side to side in the frame.  If you need a hammer to move it, is that proper?

itwisnaeme

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Re: Tighten up the chain and now Bottom Bracket clicking on Mercury
« Reply #6 on: June 16, 2017, 07:35:47 PM »
I read somewhere if you undo the bolts for the eccentric bracket and insert a coin or similar into the space, then re tighten this should force it apart to allow you to free it off. Regrease to stop it seizing  up in future. Hopefully this makes sense to you. :)