Clutch Housing nut reverse threaded?

[JimF]

There wasn't a tab washer in there when I took it apart, and I put it back together without one.

If I leave it "as is", what will be the givaway that the clutch nut has come loose?

Is it a catastrophic failure if it comes off, or just the inconvenience?

Is it the same part for narrowcases as widecases?

Jim

[DewCatTea-Bob]

" If I leave it "as is", what will be the givaway that the clutch nut has come loose? "

____ When it first comes-loose, you'll notice that the clutch hand-lever's adjusted slop will vary depending on whether the engine is accelerating the rear-wheel (opened throttle), or the rear-wheel is forcing the engine to turn (closed throttle).


" Is it a catastrophic failure if it comes off, or just the inconvenience? "

____ When the nut becomes THAT loose, then the clutch-plate set will not be able to be disengaged,, and when attempting to do so, the whole clutch will then be forced outward & against the inside of the primary-cover, (which of-course is a bad-thing).


" Is it the same part for narrowcases as widecases? "

____ Yes, same "tab washer",, (but you could make your own ['lock-plate'] which would work much better).


Dukaddy-DUKEs,
-Bob

[Ventodue]

Btw, Jim, I have now found a torque setting reference. It's in the Clymer manual which I think - and correct me, someone, if I'm wrong - was basically a re-print of the narrow-case factory workshop manual

Anyway, in the Clymer, it says, 700-850 ft/lbs (it's at the top of page 57 in my version).

Ciao

Craig

[Ventodue]

" Is it the same part for narrowcases as widecases? "

____ Yes, same "tab washer"

And here he is, Jim ...

[DewCatTea-Bob]

____ Firstly, thanks Craig, for being one of our members who wish to bother themselves to help-out here at this w.site !


" in the Clymer, it says, 700-850 ft/lbs (it's at the top of page 57 in my version). "

____ Of-course that can't be right... I'm now not where I have one of those manuals to check-out for myself but, it seems that either SOMEone has left-out a decimal-point, or possibly had actually meant 'cm/kg' (rather than "ft/lbs") !
Cuz I could far-more easily believe 50.5 to 85 foot/pounds, for that clutch-nut.


Dukaddy-DUKEs,
-Bob

[Ventodue]

" in the Clymer, it says, 700-850 ft/lbs (it's at the top of page 57 in my version). "

____ Of-course that can't be right...

Ta, Bob - no, it can't . Should have seen it, but that will teach me to believe anything I read in a Clymer ...

And that's got me thinking about the earlier value I gave Jim for a standard 16mm nut. Even though I got it from what is claimed to be the ISO table * ...



... it has to be a load of tosh. Sorry, Jim . I'll go edit my earlier posting.

* ISO 898-1:2009, "Mechanical properties of fasteners made of carbon steel and alloy steel. Bolts, screws and studs with specified property classes. Coarse thread and fine pitch thread."

Ciao

Craig

[DanM]

The chart is in Newton Meters. 218 Nm = 161 Ft Lb

[Ventodue]

The chart is in Newton Meters. 218 Nm = 161 Ft Lb

Sure is, Dan. And that's the figure I gave Jim ... and can't be right, surely ?

[DesmoDog]

In any case, be sure to heed the factory's warning to NOT USE the kickstart shaft as a brace for the tool you use to lock the clutch housing in position so you can remove the nut. The warning is easy to miss in the service manual (well, it was easy for me to miss apparently).

This is the result of trying to use that shaft to brace the tool:



Note the shiny area where the kickstart shaft boss used to be.



Don't be a maroon like me, pay attention to the small print in the manual... that little "oops" was a four year long gumption trap on my 160 project.

[JimF]

Thanks Howard,

I received your locking tabs and installed the first one yesterday - perfect fit - easy to use.

locking tab.jpg

They can be had at:

www.discovolantemoto.co.uk


Jim