SOHC.co.uk Forums > CB750

Torque settings

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Green1:
Never owned a Torque wrench I just do everything to the setting of that feels about right.

Saying that if I had to dig into the engine a little deeper I still wouldn't get one I would get Graham to do it.  ;D

Rob62:
I’d go with Honda’s chart but would always target the lower value for the sake of mechanical sympathy..... they know, they designed and built them.

Nurse Julie:
I was taught by him indoors to always go for the lower values too. Those settings were applicable for when the fixings were brand new, and the metal the fixing is going in to was brand new but maybe 40-50 years old now. Also, as with all Honda translated documents, there are some errors in the values printed.

K2-K6:

--- Quote from: Trigger on December 30, 2018, 07:22:23 PM ---If you do the sump bolt to 32.5, you will be looking for a new sump pan  :o And 86 on the flywheel bolt  >:(

--- End quote ---

That is weirdly high for the sump bolt isn't it.  Don't think I'd get anywhere near that.

Something in those numbers as well ( for sump drain bolt)  the range from bottom number to top number increases, by getting close to,  50% over and above the lower number.  That just can't be right.

Someone recently asked me if I could account for the range of torque settings specifically quoted for the 750 engine, for which I couldn't come up with a competent answer.

I've studied (decent time ago)  how torque stretches studs, compresses thread pitch in nuts etc,  looked at elongation of tensioned studs, stretched materials through yeald point and so on,  but just can't see why they quote such a wide range rather than give a target.

If you add the range together with a error percentage for torque measuring device,  it could be miles apart from the reality.

Rob62:
Torque isn’t so critical on these machines, so long as the figure is high enough to hold it together and not too high to cause damage...that’s probably why there is a fairly wide target to hit.... like a few have already said, you can get by without a torque wrench on most jobs...in fact probably everything except the crank cases and cyl head....

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