Head torque procedure

As title says,
I would normally torque to say 15LB, then 20LB, 25LB and finally 30LB
But the Norton has two nuts at 20LB. Would I ignore these after I reached 20 LB and just work on the other 8? or keep changing the settings on my torque wrench for these two?

You need to at least check that they don't move at 20 lb after the others are done to 30.

The bolts need to be torqued in a certain sequence. See your shop manual. The 20 ft/pd are the last to be torqued. Check them on your final torque circuit.

Andy Higham said:

As title says,
I would normally torque to say 15LB, then 20LB, 25LB and finally 30LB
But the Norton has two nuts at 20LB. Would I ignore these after I reached 20 LB and just work on the other 8? or keep changing the settings on my torque wrench for these two?

Click to expand...

No.

Follow the torque sequence.

Use lower figures for those 2 fasteners, ie get them all to 25 and 15 respectively, then finish them all off to 30 and 20 respectively. Keeping to the correct sequence all the time.

There is conflicting information on the torque values. It is written up here: https://www.gregmarsh.com/MC/Norton/Info/NortonTorque.aspx

Also, #s 2, 7, 8 will likely pull out if you use the increased torque value stated in Service Release N3/68. If you have the original three studs, there a good chance they will be fine a 30 ft. lb. If you have replaced them with the ones AN currently offers, there is a good chance they will pull out at 30 ft. lbs. In the link I provided is a link to the service release and a link to a study I did on those three studs.

BTW, not blaming AN, they are making them to the drawings - it's just that the drawings are wrong.

It is a terrible feeling when one of those studs pulls and you don't own a machine shop or have a decent one nearby. Last time it happened to me and I didn't have a spare head of the right type, a bunch of begging got Jim Comstock to save me. I needed him because the local machine shop put the inserts in crooked!

marshg246 said:

It is a terrible feeling when one of those studs pulls and you don't own a machine shop

Click to expand...

Bin there done that.

Im on that bus too. :-(