Remove propeller/rudder to replaced stuffing box?

[DBBRanger]

I'm in the middle of trying to fix the threads on my stuffing box nut and am thinking if all else fails, I may have to replace the nut. Has anyone replaced the nut or the stuffing box on an R25 Classic?

Questions:
Can it be done without removing propeller? If no, does the rudder need to be removed?
How is coupler held on - is it a tapered shaft with a nut on the end?
Does the set screw just keep the nut from turning?
What socket size do I need for the nut?

Thanks for your help. This seemingly small job (replacing the packing) has turned into a nightmare!

 

[Osprey]

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[BB marine]

*Remove the 4 coupling nuts and bolts.
*Slide the shaft back far enough to get a shallow socket on the prop shaft nut holding the coupling in place.
*Use a block of wood between the hull and a prop blade to lock the prop from turning while loosening the coupling to shaft nut. Remove nut and two set screws from the coupling
*Leave block of wood between the hull and prop blade and loosen and remove the prop shaft nut.
* Use a prop puller to remove the prop from the tapered shaft'.
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* When the prop is removed pull the shaft out enough to get a puller installed on the coupling to pull the coupling off the tapered shaft. (Note: If you do not have enough room for the puller. Use a solid mandrel. place it in between the transmission shaft and the prop shaft inside the id of the couplings. Use longer 3/8 bolts or threaded rods to bolt the couplings together. Keeping the mandrel centered. Tighten the 4 3/8" bolts or rods. As you tighten the bolts and draw the couplings together this will push the prop shaft off the coupling taper. When the taper fit is released the coupling will come off and you will be able to remove and install a new packing nut onto the shaft.

*Install everything in reverse order and tighten.

 

[DBBRanger]

Thanks for the replies.

Note: If you do not have enough room for the puller. Use a solid mandrel. place it in between the transmission shaft and the prop shaft inside the id of the couplings. Use longer 3/8 bolts or threaded rods to bolt the couplings together. Keeping the mandrel centered. Tighten the 4 3/8" bolts or rods. As you tighten the bolts and draw the couplings together this will push the prop shaft off the coupling taper.

I saw a video where a guy loosened the nut but did not take it off using it as a mandrel. It seemed to work quite well rather than a puller. The real question is: Do I have enough space once the coupler is loose from the tranny and the shaft is retracted to get a socket and ratchet in between the tranny and the coupler. I have about 1 1/2" of shaft showing inside and less than 2" between the prop nut and the rudder. So I may have a chance.

Thanks again

 

[BB marine]

You may have to cut a socket down. Measure the height of the nut. Cut the socket down to this dimension. This should give you enough room to get the socket and a breaker bar in place. To get better leverage for loosening the nut. Use a breaker bar and support it against the stringer. Leave the cotter pin in place at the prop nut and use a large wrench on the prop nut to loosen the coupling nut. You will have better leverage outside the boat to loosen the nut at the coupling.