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Post by mamboopilot on Sept 7, 2009 8:02:16 GMT
Hi !
My Xj clacking hard sometimes when accelerates.
The sprockets are fine, the chain seems to, but i found 10-15 broken rubber rings coming from the chain in the greasy dust below the front sprocket.
I've also found two redish plastic ring at the size of the front sprocket, one was just below the sprocket, one was broken.
Do these explain the strange clacky noise ?
Do i have to change the chain ?
Please help me !
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Post by sindento on Sept 7, 2009 8:38:56 GMT
Could be a few seized links where the seals are missing so they are not following the teeth of the sprockets properly.The noise will be the links hitting the sprocket teeth when they are forced down.
Have you tried just turning the back wheel on the stand and listening,you cant miss the sound of seized links trying to follow the curve of the sprockets.
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Post by mamboopilot on Sept 7, 2009 8:56:18 GMT
Thanks for the quick response, yes, if i'm turning the back wheel it gives a rattle noise, but that loud clacks obviously don't happens because the lack of power.
i will do a youtube video soon.
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Post by sindento on Sept 7, 2009 9:01:05 GMT
Usually sound worse if you turn the wheel backwards as well.
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Post by CD on Sept 7, 2009 9:09:55 GMT
The chain sounds like it's shot. Also check the rear sprocket carrier bearing as that can mess things up. If that has gone, it's best to do the two wheel bearings at the same time.
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Post by mamboopilot on Sept 7, 2009 9:21:51 GMT
how can i check the rear sprocket bearing ?
If the wheel is in place, i can't move the rear sprocket sideways,
do i have to disassemble it to observe the bearings ?
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Post by CD on Sept 8, 2009 8:38:15 GMT
The only way to be sure is take the wheel off and turn the sprocket carrier bearing with your fingers. No need to take it off the bike. It should feel smooth. Any lumpiness, though probably not enough to upset the chain, suggest its on the way out. I always use bearings with integral soft seals and slap them straight in. Some folks add a bit more grease but dont over pack them. Get them from any industrial bearings supplier.
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Post by pilgrim on Sept 8, 2009 21:05:15 GMT
I'm not sure that's all to do CD..... "Take the wheel off"......... You can only do that with the sprocket carrier/cush drive together. You've already taken the axle out because there's not enough space to do otherwise. Anyway, when my sprocket carrier bearing failed (recently) there was lateral movement, ie: along the same direction as the axle, side to side with all in place and tightened up so you could find the fault there. If you dis-mantle the rear wheel totally you can get a better view.  |
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Post by mamboopilot on Sept 8, 2009 22:10:02 GMT
Thanks guys, problem solved, chain and sprocket wheels have been changed.
The chain was shot, some links were very tight, the sprocket wheels were ok, but we changed all of them together.
Also the bearings were checked, good news that they are fine.
Thank you again !
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