Quote:
Originally Posted by
bikemad195
You're listening to the knock.of the cogs around the crank due to it's nut becoming loose I have just retorted and locked mine at 120nm for the 2nd time 10.000miles between and there is no way my nut could of rotated I was talking to someone the other day and the only way this could be happening is the crank is slowly stretching ... which makes sense how can we tighten something and it not rotate but become loose when it's against a stop .... best answer I've heated so far ...... if u luck for a vido on youtube you will find videos under "xt660x knock" both of the noise and what's causing the noise .... the channel name is "Marvy finger bottom" lol don't ask.... may also come up under "bikemad195" can't provide links as I'm laid in bed on my phone lol
|
The crank doesn’t stretch, it’s the crankshaft washer that wears; this also caused the vast amount of vibration (metal to metal rubbing) when worn.
This give the illusion of crank stretch but as you know the nut is still fully Loctited, so does give the impression and add to the illusion!
Just fitted my third washer this year! And taken Minky’s advice and torqued the crankshaft nut up to 120Nm, but some have taken this higher (just be careful as if the bearing preload is too high there will be increased bearing wear).