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Author Topic:   prop lock nut torque

Eric posted 05-30-2001 01:41 PM ET (US)
My prop lock came today, and before I install it on my 99 Johnson 90, I have a question or two. Since there's no provision for a cotter pin, it seems especially important to get the torque setting correct. The service manual for the motor specifies a torque value of 10 foot pounds (120 inch pounds). The directions say to continue tightening just enough to install the cotter pin. Well, 10 foot pounds is just past finger tight, and I had to go to about 16 to get the cotter pin to line up. I felt a lot less likely to lose the prop at the higher setting. When I mentioned that I felt the torque setting seemed a bit low to the OMC mechanic, he said that they just tighten them up, and don't bother with the torque settings. Should I do the same, torque to the 10 foot pounds, or something else?

Hoop posted 05-30-2001 09:03 PM ET (US)
Eric,
I don't have a McGard prop lock, but I bought 2 before concluding that they don't make one to fit my outboard, a Evinrude/Suzuki 70hp four stroke!
I read the manual a lot, though, for the McGard prop lock.
My sense is that the rules change with the McGard prop lock. They use a convex washer to keep the nut engaged, and they specify the foot pounds of torgue. My recollection is that the McGard specifications were much higher than the engine service manual recommended. I would go with the McGard specs.
Hoop

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Author	Topic: prop lock nut torque
Eric	posted 05-30-2001 01:41 PM ET (US) My prop lock came today, and before I install it on my 99 Johnson 90, I have a question or two. Since there's no provision for a cotter pin, it seems especially important to get the torque setting correct. The service manual for the motor specifies a torque value of 10 foot pounds (120 inch pounds). The directions say to continue tightening just enough to install the cotter pin. Well, 10 foot pounds is just past finger tight, and I had to go to about 16 to get the cotter pin to line up. I felt a lot less likely to lose the prop at the higher setting. When I mentioned that I felt the torque setting seemed a bit low to the OMC mechanic, he said that they just tighten them up, and don't bother with the torque settings. Should I do the same, torque to the 10 foot pounds, or something else?
Hoop	posted 05-30-2001 09:03 PM ET (US) Eric, I don't have a McGard prop lock, but I bought 2 before concluding that they don't make one to fit my outboard, a Evinrude/Suzuki 70hp four stroke! I read the manual a lot, though, for the McGard prop lock. My sense is that the rules change with the McGard prop lock. They use a convex washer to keep the nut engaged, and they specify the foot pounds of torgue. My recollection is that the McGard specifications were much higher than the engine service manual recommended. I would go with the McGard specs. Hoop