View Full Version : Propeller Installation Torque Specification

07-16-2006, 10:38 AM
So I discovered the other day that my prop had loosened up a slight bit on the shaft. I'm going to keep a close eye on it, but as it's 90 today I simply want to tighten it up and get back on the water. But I have no idea what torque I should tighten the prop nut to... Anybody know? I have a 1984 with the 454, 1:1 and a 13x13 OJ prop.


07-16-2006, 12:32 PM
The torque spec on my ACME NiBrAl is 35ft-lbs....should be similar I'd think.

07-16-2006, 03:46 PM
The 25-35 ft-lb range. If the prop nut has been off several times, the nyon in the lock nut maybe weak too and not holding like it should.

07-16-2006, 05:33 PM
As a general rule, change the nyloc propnut everytime you remove one, as previously posted the nylon collar in the nyloc nuts become worn from reuse and can back off, and as you run a prop over a period of time the prop will force itself up on the taper on the shaft from it's pushing forward and will add clearance to the nut/prop joint. Always re-torque the nut after a couple weekends use, to assure a correct tightness. Be sure you always use a cotterkey in the shaft end to keep from losing the nut and maybe the prop.