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fstbttms · 24-09-2021, 07:22

Quote:

Originally Posted by BoatBumm

BTW, drilling a hole through a SS prop shaft is NOT all that hard.

He's talking about doing it underwater.

BoatBumm · 24-09-2021, 08:13

Yes, I know that the original poster was talking about drilling underwater, but then others jumped in talking about drill presses, etc., which I was presuming they didn’t intend to do underwater. Just trying to be helpful.

flightlead404 · 24-09-2021, 08:24

Quote:

Originally Posted by Wotname

This ^^

Lock tab washers were quite common in older engines and vibrating mechanisms - they work.

Got 'em all over my airplane and bits don't fall off (mostly)

They need to be used correctly, just like any other locking mechanism. That means having enough tab bent over, and bent in the correct place. They are not reusable.

Ltfdrebbin · 24-09-2021, 08:27

I raced motorcycles for many years. The countershaft sprocket on our bikes had a lacking washer instead of a cotter pin. This is the shaft that comes out of the engine and drives the chain that drives the wheel. Race bikes produce lots more horsepower than a sailboat motor, and they are ALWAYS ridden hard. This design worked when used properly and maintained. My guess is that it is even stronger than a cotter pin. No reason it will not work in the future for you if used porperly.

sailorladd · 24-09-2021, 10:36

That's an almost impossible job underwater...

What I would do would be to put the new prop back on and fit a locking washer between the prop and the nut, and once the nut has been cinched up tight with the locking washer sandwiched between the two, there is a little square side on this washer that now needs to be hammered down flat against the side of the nut (a flat part of the nut) and this will surely keep your nut and prop from coming off until you need to haul out and repaint or whatever.....

I think it might also be worthwhile putting some loctite on the nut thread just before you tighten it home on the shaft....

fstbttms · 24-09-2021, 10:45

Quote:

Originally Posted by sailorladd

That's an almost impossible job underwater...

What I would do would be to put the new prop back on and fit a locking washer between the prop and the nut, and once the nut has been cinched up tight with the locking washer sandwiched between the two, there is a little square side on this washer that now needs to be hammered down flat against the side of the nut (a flat part of the nut) and this will surely keep your nut and prop from coming off until you need to haul out and repaint or whatever.....

I think it might also be worthwhile putting some loctite on the nut thread just before you tighten it home on the shaft....

Assuming he decides against drilling the shaft for a cotter pin, the OP only needs to purchase the prop and nut kit that is standard equipment on his boat. Trying to modify his setup is reinventing the wheel and is a bad idea. As is putting Loctite on ANY part of the prop/shaft/nut arrangement.

Cadence · 24-09-2021, 10:53

Quote:

Originally Posted by fstbttms

Assuming he decides against drilling the shaft for a cotter pin, the OP only needs to purchase the prop and nut kit that is standard equipment on his boat. Trying to modify his setup is reinventing the wheel and is a bad idea. As is putting Loctite on ANY part of the prop/shaft/nut arrangement.

Just out of curiosity, why no Loctite other than being over kill?

fstbttms · 24-09-2021, 10:58

Quote:

Originally Posted by Cadence

Just out of curiosity, why no Loctite other than being over kill?

If you had ever been asked to remove a nut or prop underwater that has been smeared with Loctite or 5200, you wouldn't ask that question.

Look people, quit trying to fix what ain't broken. I guarantee the engineers and designers who created these systems know more about how they should work than you do, and trying modify them is just asking for trouble. They work just fine the way they were designed.

hartcjhart · 24-09-2021, 11:06

another vote for the 'Locktabs' I work in heavy industry ie 500mgw generators and ther turbines,locking tabs allover them and never seen 1 fail,
if you are still nervous haul out replace the tab and get a welder just to put a spot weld on it

fstbttms · 24-09-2021, 11:07

Quote:

Originally Posted by hartcjhart

if you are still nervous haul out replace the tab and get a welder just to put a spot weld on it

Weld the lock washer to the nut? Are you serious?

hartcjhart · 24-09-2021, 11:10

Quote:

Originally Posted by fstbttms

Weld the lock washer to the nut? Are you serious?

a spot weld yes serious why not

sailorladd · 24-09-2021, 11:12

Quote:

Originally Posted by fstbttms

Assuming he decides against drilling the shaft for a cotter pin, the OP only needs to purchase the prop and nut kit that is standard equipment on his boat. Trying to modify his setup is reinventing the wheel and is a bad idea. As is putting Loctite on ANY part of the prop/shaft/nut arrangement.

I don't see why putting Loctite on the prop nut is a bad idea? and as for the original idea of the prop kit being sufficient, it obviously was not! Being a boat owner/sailor/cruiser one has to think outside the box and make things work in a crunch time... Loctite is a perfectly acceptable engineering component and this is a lot more practical than trying to drill a hole in a stainless steel shaft under water.....you are quick to criticise any suggestions but don't come up with any ideas yourself.....?

fstbttms · 24-09-2021, 11:13

Quote:

Originally Posted by hartcjhart

a spot weld yes serious why not

Because how the hell is a diver supposed to remove the prop after that has been done?

hartcjhart · 24-09-2021, 11:14

Quote:

Originally Posted by sailorladd

I don't see why putting Loctite on the prop nut is a bad idea? and as for the original idea of the prop kit being sufficient, it obviously was not! Being a boat owner/sailor/cruiser one has to think outside the box and make things work in a crunch time... Loctite is a perfectly acceptable engineering component and this is a lot more practical than trying to drill a hole in a stainless steel shaft under water.....you are quick to criticise any suggestions but don't come up with any ideas yourself.....?

ordinary Loctite ouch,threadlocker not so bad again we use it