Here is a graphic that shows the preferred stud and nut tightening sequence and required torque for the cylinder base on a pre-1972 750 Norton Commando.

This is also available as a PDF download in case you want to print it out to keep handy in your workshop!

Just click here to download

For the launch of the Combat engine in 1972, the Norton engineers made an effort to move some of the hardware over to UNC and UNF thread forms.

Here is a graphic that shows the preferred stud and nut tightening sequence and required torque for the cylinder base on a post-1972 750 Norton Commando.

Here is a PDF that you can download in case you want to print it out to keep a copy handy in your workshop.

Just click here to download

The requirements are a little different for the 850 Norton Commando – the crankcase is stronger, and there are four long through bolts (C, D, G & H) which run the height of the cylinder.

These can only be accessed with the head off.

Again, available for download as a PDF file for you to print out and keep.

Just click here to download