Ok if these prop shafts have a compression washer system then I would go with the Man. torque setting, if it has the lock washer then good and TIGHT is the way I would go. 55 ft lbs =660 inch pounds which I would believe should be correct based on the size of the prop shaft and the Nut. 100 ft lbs (or 1200 inch lbs) sounds very high to me for this application. Not sure about the prop shaft but I do Know that bolts can be stretched from over torquing them, i would assume this would also apply to a prop shaft, since it is bassically a Bolt, holding the prop on, it would take ALOT of torque though. Without having the lock washer you can do as we do in the Helicopter world on rotor systems and that is a re-torque. After you run the boat the first time through all variable ranges, re-check the prop nut to verify the nut did not slip and loosen, gives you piece of mind. Should always do this with your trailer lug nuts as well any time you take the wheel off.Last edited by JSLAW on February 27th, 2009, 4:52 pm, edited 2 times in total.
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