Found it! 55-60 ft lb
Do you think that 55 ft-lbs would be good number for most props on 85HP and up engines? Can't find a torque spec for mine, anywhere.
Yes. I had the 1971 85 triple I bought new and I don't remember the exact number but the shafts are probably the same diameter so the nut should tolerate the same ft-lbs. You don't want it loose.
Thanks, Tex.....will try that 55 ft-lb torque spec and see how it goes.
Were you satisfied with the service from PropMD? Was thinking about buying a new prop from them.....thanks.
I used them twice for prop repairs. Relatively quick and good workmanship.
I can't argue with that. Last cotter pin outboard I had/used, I bought new in 1959...an 18 HP Evinrude Fastwin. Had a straight shaft with a hole in it for the "shear (not drive) pin". 3 blade aluminum prop had a rubber slip hub with a metal indent to fit over the pin. After installing the prop, just push it on, install the non threaded prop nut, just a gadget to look pretty, stick the pin through the holes, bend a tab and be on your way. Did it rattle....yes.
My 28 hp Evinrude I think from the 70's
Well you have me wondering now. The only threaded nuts I had back then was on my 25 hp Wizard....a Western Auto engine line made by Mercury. It was a spin off from the Mark 30. It had the spin on nut and a dozen or so tabs you bent over to lock the nut to the prop shaft.
I suppose plastic hubs that require high torque have mounting instructions shipped with the props. 2:1 difference surely would dictate alerting the purchaser I'd think, especially if the person, like me, was used to the 55 spec..
That tells it like it is. Since my engines don't use the bushing, I had no reference to the higher torque. Thank you sir!
