tcelano

Just curious, is your failure attribututed to the prop nut backing off first, or just a propshaft failure?

Where did the propshaft break exactly? What was left in the drive? Did it trash any gears, bearings, or seals?

Pwrbt33

iTrader: (2)

I'll see what I can find out.

Thanks!

Farquar

The post was titled"Copied" Did not happen to my boat,so I can't answer your question.Now if I can find the post i will send it ,so you can ask him. Thanks

Farquar

Hello Tcelano;Found the original copied post by "Chuck" 6-11-2010. If you want to contact him.Search"Mercury had a bulletin". It is #6 or 7 on page. Thanks for your interest

RunninHotRacing163.1

we have found them loose b4 as well and put them on and off every time we go to the water with an impact , the double nut idea is a good one most of the #6s i've seen around only have a xtra 1/2" of thread ... maybe there using thinner nuts







ROCK ON !!!!!!!!!!!!!!!!!!!!!
I DON'T PLAY BASEBALL BUT I HIT ALOT OF HOME RUNS ...
ITS A SKATER NATION !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !

RaggedEdge

Blue Locktite every time, change the nut at least every year, have not lost one yet.

Chit happens, locktite is cheap.

bbladesprops

Wow, ok,

I spent 12 years at Mercury Racing and we never had #6 nuts backing off if the propellers and nuts were installed correctly. I was there throughtout the NXT development and we didn't have the issues you describe.
Also, no service bulletin for dual nuts has ever been issued as far as I know.

Pwrbt33, I'd sure be interested as to who you talked to from Merc. The only Marketing Representative left at Merc Racing is Is a guy named Makie. Does that sound familiar?

Change your nuts after a few on and offs and there should be no issues.

Brett

keith2500hd

if i have to pull nylok nut off, i use ballpeen hammer to tap bulges between indents. i do 3 of them, spaced apart. just tap on flat surface will push nylon out. have used i think upper swivel shaft nut to compress nylok nut's nylon on props that did not have any other tab or cotter pin hole.

proboat-wes

i agree with bblades and have never had or heard of this issue,love to see the facts in actual print.

KNOT-RIGHT

I was asked by another member to comment on this thread.
So here is my worthless opinion.

I have lost my share of props. One instance a 5 blade 37 hering comes to mind. The direct cause of this prop loss was a nut that backed off.
In a perfect world one would never loose a prop on a new #6
with a new mercury nylock torque to 100foot lbs. The tolerances
are near perfect.

Here is the facts. Continuous use in a salt water environment
caused the threads on the shaft to actually get worn diameter wise The constant removal of the props and nuts causes wear on the diameter.
I replaced a prop shaft last season only to notice when installing
new factory mercury nylocs the new shaft required much more force to turn the nut.

New nylocks every season.......Yes!
Locktite.......Hell yes
Thin double nut locking..........Even better.
Arneson drives use cotter pins Call rik at Arneson and ask how
many props hes loss from a backing off nut.

For those of you who have put your boat in reverse and all of a sudden your engine revs in forward and reverse but does not move you will welcome the above ideas with open arms.
Those that have not....Bookmark this thread you may be glad you did