Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: mercury 40 prop nut torque / washer

Posted by catman on 07/19/08 - 4:16 AM
#1
I just bought a used merc 40, 1990, 4 cyl, 2 stroke , o.b.
I have rebuilt the water pump and ready to re assemble.
1 .What is the torquue psecs for the prop nut
2. does merc use a washer in between the prop and nut ?

thanks

Posted by Binkie on 07/19/08 - 7:41 PM
#2
Don`t know anyone who torques prop nuts. Just put a short piece of 2x4 between the prop blade and the cavitation plate, and tighten it, kind of like you tighten a lug not. Im sure a washer is involved.

rich

Posted by John Fyke on 07/20/08 - 3:59 PM
#3
Tighten until snug and put the cotter pin in.

Posted by CES on 07/20/08 - 4:49 PM
#4
After you snug the nut down and put the cotter pin in, use it a few times and then check if the prop slides on the shaft. If it does, take the cotter pin out and tighten the nut a little more and re-install the cotter pin. You should be good to go then.