Topic: PS control valve installation

[CCP]

    Hi guys. Installing a rebuilt PS control valve on this '66. I replaced the aluminum tube seats in both the valve and the power cylinder. The lines are also new. Is there a torque spec for the control valve to power cylinder lines? I could not find anything listed in the service manual. One article I read said that you cannot over tighten them (the tighter the better) since the steel lines will seat into the soft aluminum the more you tighten them.
  I don't feel comfortable tightening anything to that extent. Any advice?
          Thanks, Pete. 

[RoyceP]

Just tighten them with an ordinary open end wrench. If you round off the flats of the hose nut then you are trying to tighten it too tight.

[KevinK]

It takes a special set up and a calculation to use a torque wrench if you had a torque spec.  This is an unreasonable expectation outside of the factory installation.

[lancelot66]

I have an old set of tubing wrenches I use for those, as well as tranny lines into the radiator. Just go snug with them and don't go all the way out to the end of the handle and tighten them down as far as your strength permits. You'll get the hang of it. It's sort of a 'feel' thing...I palm them at about midway down the handle and that seems to always be about right.

[CCP]

  Will do. Thanks for the input.

[KevinK]

There may be a different type of tightening spec. In my industry, we use a metal crush gasket to seal fittings. Even with stainless steel fittings, tight is 1/4 turn past snug. If you go more than this with brass, aluminum and steel something will get distorted. Always use tubing wrenches if you can get then on it.

A little research comes up with this. Using mixed materials requires the flats method. 1-2 flats of the nut depending on the size.
https://www.hoseandfittings.com/jic-torque/

[CCP]

  Thanks, interesting reading.