Crank nut - is it a new world out there?

[turboguzzi]

Hello Everyone

Been quiet as my SP simply runs perfect.

But there was a fly in the ointment in the shape of some metallic clatter at idle and certain revs.

Not surprising, cam chain slack, OEM tensioner was not controlling the chain anymore... so went with the Valtek/Stucchi like i had in my LM III

Doing it up now, the question i have iS regarding the stupid gu95028025 lock washer..... #5 in the first pic... in which at the right torque you never have the tongue in place to bend

Looking at the newer models, it still the same crank nut thread (M25 x 1.5) BUT, low and behold, NO LOCK WASHER, just the recommendation in the manual to tighten to 200 nm / 147 lbft) and no loctite.... #4 in second pic....

So has the world changed and bent tab lock-rings not really critical anymore? Or do you just follow your model manual and obediently buy a new lock-ring to tab bend?

just to make sure we understand each other, thinking of omitting the part in last pic and jsut go with torque.

objections?

im all ears

 

[V700Steve]

Go more torque or less to lock tab, that's how it works.

 

[turboguzzi]

tnxs, and sure, thats what ive always done.... but that was not the question...

Maybe i didnt emphasize it enough....

the main question is: newer models dont have the lock ring and do just fine. Any reason the approach will not work on the older models?

I have a fresh lock ring, 2$ from my bearing supplier 5 minutes from home. Am just curious about why guzzi stopped using it if it was so great.

BTW, same story on something like the V 11, no lock ring

 

[V700Steve]

I just do what book says, that's it. Not the answer you want to hear I'm sure .

 

[turboguzzi]

exactly!

tnxs anyway

 

[scott_m]

the main question is: newer models dont have the lock ring and do just fine. Any reason the approach will not work on the older models?

Difficult if not impossible to say. There are a host of factors that come into play, metallurgy, thread design and pitch, engine characteristics, a ton of various things actually.

Put the ring in new. €2 to put it together the way it was designed and is cheap insurance. To not put it together as designed, is just silly.