Does anyone know where to purchase the locking nuts at the end of the prop shaft, aft of the prop. I only have one nut and a cotter pin. I believe I have the thicker of the two nuts. I know it is a 1" shaft, but don't know the nut/thread size, or where to find them. I don't see them on Catalina Direct.
Mike.....
Mike : Contact any prop shop or prop company and ask them for a replacement nut for a 1" shaft - it's standard.
We ( also a C36 & C30 & C28) all only have one castellated nut for a cotter pin - that's normal. The only place on that prop shaft that has a second locking nut is at the stuffing box.
With a castellated nut and cotter pin there is no need for a jam/locking 2nd nut.
A few thoughts
Just to add my 2 cents. The nut and cotter pin should be similar material to the shaft.
Jim
Hi,
There are 2 type thread per diameter. Coarse or fine thread.
But as mention, if you have a nut with a pin, you don't need a jam nut (2nd nut).
The normal thread size is 3/4 * 10. FWIW If you use 2 nuts the thin nut goes first, to full torque. The thicker nut goes last, again to full torque. That's by the book. A lot of mechanics will do it the other way and don't seem to have problems.
Jim
If you're going to start getting technical, http://www.pbase.com/mainecruising/fitting_a_prop
Quote
If you're going to start getting technical............
For some information overload ........ here's
WHY the jam nut should be used first, followed by the thick nut..
http://www.boltscience.com/pages/twonuts.htm
-kk
The following is a picture of the setup of the propeller on my C34, the PO says this is the way it has been for over 27 years.
Thanks to everyone for the great feedback, I really appreciate it. I hope to get out to the boat this week to check the stands, so I'll double check my shaft nut configuration. I thought I had taken some photos in the fall, but can't seem to find them. Thanks again!
Mike.....
Ed- We're the two zinc shaft collars also the PO's way of doing things?
Noah,
It originally had two zincs on the shaft so when I replaced them I did the same, I asked the yard where the boat was hauled and some others at local Marine supply, what I got what it might be overkill but wouldn't hurt. I searched for info on this forum & found nothing negative. Why do you ask?
BTW, when I had the boat hauled for the survey I was told the nuts were backwards, as was stated on this forum the small nut should got on first. I forgot to reverse them when the boat was hauled, had it written down but it was overlooked because other items took priority.
Ed- i have just never seen two zincs on the shaft at once. I don't know if it is "wrong"... Just curious. It may be a "fine" belt and suspenders approach?
Noah : Most people that attach 2 shaft Zns do it to prevent one Zn from eroding at the thin thru bolt hole collors and falling off the shaft.
That way there would be at least one Zn. I have never done that.
A thought
At least somebody else has heard using 2 Zncs on the shaft, I feel better. Thanks Ron.
Hi,
I also have 2 of them.
simple reason, when I got the boat, the zinc was halfway gone, so before splashing, I added a new one beside it, not knowing how long it would last.
So every spring I check the erosion of them, and when the older one get to eroded, I replace it. Is it overkill, yes.
The shaft anodes on a sailboat should be placed as close to the strut as possible without impeding flow of water to the cutlass bearing. Usually about two finger widths in front of the strut is fine. Placing them further away from the strut creates shaft imbalances and "shaft whip" (jump rope effect) when the anodes wear unevenly.
Also most anodes are not installed properly to allow them to do their job...
Anode Installation - Best Practices (http://forums.sailboatowners.com/index.php?threads/anode-installation-best-practices.175835/)
Mainesail, once again, great info on the anode install best practices!