Originally Posted by
WLIU
I have to report that I too was surprised by some of the material. I have a engine where the Hartzell prop has to come off every 25 hrs. 6 of the wonderful Hartzell stud/nut/roll pin "bolt" assemblies. Hartzell Propeller Owners Manual 115N says dry threads when torquing them. And I see no plating on those threads. And the Hartzell instructions state that the studs can be reused when the prop is removed and replaced. I think that I have removed and replaced that prop at least 20 times. And that prop sees me do snap rolls in IAC competition. Which is a lot of stress. No issues so far.
Now prop bolts are not the same as cylinder hold down bolts or case through bolts, but they are highly stressed and the same requirement for consistent torque on all of the bolts applies. So how do I square Hartzell's instructions to torque the fasteners dry with the article's description that you can't get consistent torque unless the threads are wet?
Best of luck,
Wes
N78PS