Jota - primary chain rattle

CLEMTOG said:
it was fixed with a very expensive two pack treatment from Loctite, which was recommended to us by the unofficial UK sales rep (shame he is not on commission) Simon (he who glows in the dark ) Ralph.
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Yes Clem, Loctite 660 Quick Metal! Currently ?32 for one tube, but it is designed specifically for worn parts like splines.
 
It is clear that if the primary gear is in any way able to move it will take the spline teeth with it. What holds the primary gear in place is the friction (coefficient or whatever) of the enormous torque we do the nut up with that holds the sprocket tight against it?s mating surface. As I see it, any hard substance in there that prevents creep should be ok, as long as that nut is done up enough to prevent movement. If that nut allows movement, even very small, the sprocket will eat the crank end.
 
I still have the half empty pot of Quick Metal, but strangely there is no Loctite number on it, its in a pot with a, sort of, bellows in the bottom, for oozing the stuff out, at the time an activator (Loctite 7649) was recommended and incorporated in the repair, I remember the cost be a ;lot greater than that Simon, I don't know why but ?70 for the jollop and ?30 for the activator springs to mind. It certainly worked for a few years and may even still be there.
CLEM
 
tom3c75 said:
... the tube does seem to breathe when squeezed with the cap still on!
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Most Loctite products set anaerobically. They'll stay liquid as long as they're exposed to air, and only set hard(ish) when the air is excluded. I have no clue about the chemistry of how that works, but that's why the tube "breathes" and why the little bottles of thread locking compound are only half full when you buy them. They need the air space to stay liquid.
The stuff is also thixotropic, but that's another story.

Cam
 
not quite Tomm
pictured below is what was used.

CLEM
 

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If its mine it was used on, it was taken out years ago and redone by Keith..when the clutch etc was drilled and balanced. Apparently it all needed aligning properly too. Would be inclinded to have it welded up next time..doesnt need to come apart after all..chain can be removed anyway if clutch drum bolted I recall.
 
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