Prop torque

[Tom-D]

Molybdenum and graphite are two different things. Graphite is just carbon (element number 6 on the periodic table) and Moly is 42, a metal. Molybdenum disulfide is what we find in Moly greases, not carbon.

Dan

And I'll bet you've never used powdered graphite ?

 

[Graueradler]

It can be a bear to get it off. The hub's taper wedges really tightly onto the crank. You take out a small screw and nut in the front of the hub (it's the safety to prevent the big nut from coming loose), and put a stout bar through the holes in the nut and back it off. Then you keep turning it until the nut's inside flange comes up against the fat square-section snap ring inside the hub's front bore, and further turning of the nut should pop the hub loose from the crank.

But if it's been on there a long time, it will want to stay there.

Dan

I'm not familiar with this set up but, just in general with a tapered fit, if you can get some dry ice on the end of the shaft near the taper, the shrinkage with the cold will break the taper loose.

 

[Geico266]

22 years of turning wrenches in the field of Naval Aviation. Never use a lead/graphite pencil to mark anything on a aircraft. Never scrath a line, causes stress risers cuausing cracks. Never re-use any self locking Nuts/Bolts.

Welcome to POA!

Thank you for your service, but you weren't paying for them either. Reusing them 3-4 times is perfectly acceptable, and more economical!

 

[JHW]

Welcome to POA!

Thank you for your service, but you weren't paying for them either. Reusing them 3-4 times is perfectly acceptable, and more economical!

yep. If you can't turn a nylock but with your fingers, feel free to reuse it.

 

[Dan Thomas]

And I'll bet you've never used powdered graphite ?

Yup, but it's not moly. Cessna calls for dry graphite lube on those aluminum piano hinges on the ailerons. So much for not using pencils (graphite) on aluminum, huh?

Dan

 

[Tom-D]

Yup, but it's not moly. Cessna calls for dry graphite lube on those aluminum piano hinges on the ailerons. So much for not using pencils (graphite) on aluminum, huh?

Dan

During the introduction to the fleet the navy had a problem with rusting flap tracks of the E2, which were to be lubed with moly B grease, during the investigation we learned that when Moly B was subjected to salt spray while on the carrier deck, it formed an acid, and was causing the problem. (IAW the Mobile Oil analyst) mobile then changed their formula from moly to graphite, corrosion problem went away.

Moly is expensive it is used in the making of steel. most of the black greases we use are now graphite.

and no, graphite in the pencils we use has no effect on aluminum surfaces other than scratching it.