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Old 25-08-2015, 18:31   #46
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Re: My prop fell off... f.ck f.ck f.ck.

Quote:
Originally Posted by fryewe View Post
Blue loctite is your friend.
FYI- Loctite 248 is the only Loctite product suitable for an in-water installation. It is blue in color.
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Old 25-08-2015, 18:36   #47
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Re: My prop fell off... f.ck f.ck f.ck.

It may not help in this particular case, as there has already been good advice given, but if anyone wants to learn a bit about props, shafts, and keyways, I recommend checking out the Youtube.com channel by Keith Fenner who is a machinist who specialises in marine shafts.
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Old 25-08-2015, 18:59   #48
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Re: My prop fell off... f.ck f.ck f.ck.

Prop keys can be in inches or mm, depending on where the boat has been manufactured, 99% of European boats have metric standardized shafts and keyways, while SAE std is used in the US.
Size then depends on shaft diameter.
Key has to be precisely fitting the keyway respecting tolerances in width and thickness, if you don't do that you will risk to lose your prop quicker next time and/or damage the shaft/propeller.
Here are the ISO std, then I will post the SAE std
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Old 25-08-2015, 19:07   #49
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Re: My prop fell off... f.ck f.ck f.ck.

Quote:
Originally Posted by Morse View Post
Prop keys can be in inches or mm, depending on where the boat has been manufactured, 99% of European boats have metric standardized shafts and keyways, while SAE std is used in the US.
Size then depends on shaft diameter.
Key has to be precisely fitting the keyway respecting tolerances in width and thickness, if you don't do that you will risk to lose your prop quicker next time and/or damage the shaft/propeller.
Here are the ISO std, then I will post the SAE std
I used the wrong button, here are the files now
Attached Files
File Type: pdf SAE Standard.pdf (87.3 KB, 28 views)
File Type: pdf Shaft EU standard.pdf (53.8 KB, 20 views)
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Old 25-08-2015, 19:51   #50
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Re: My prop fell off... f.ck f.ck f.ck.

you have a 30mm shaft and need an 8x8 key, 5/16" is awfully close
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Old 26-08-2015, 00:26   #51
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Re: My prop fell off... f.ck f.ck f.ck.

Dived in this morning and there was no key on the shaft. So I'm at a nearby hotel waiting for a taxi.

At the end of the shaft there is a hole which may be threaded. I tried a couple of screws but none fitted. The nut has a small hole and I wonder if it's to secure the nut?

Assuming I get the key and manage to fit the prop, I will just use the motor to get out of the anchorage and get into the marina, so even if I am missing a locking screw I should hopefully be fine. I guess I will order what is needed for the flexofold and either haul out or send a diver in to swap it back. Kind of think I'd rather haul out and watch it getting fitted


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Old 26-08-2015, 00:34   #52
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Re: My prop fell off... f.ck f.ck f.ck.

Quote:
Originally Posted by hoppy View Post
Dived in this morning and there was no key on the shaft. So I'm at a nearby hotel waiting for a taxi.

At the end of the shaft there is a hole which may be threaded. I tried a couple of screws but none fitted. The nut has a small hole and I wonder if it's to secure the nut?


Hi, Hoppy. If you can get a split pin through the hole after the 3 blade is on, that will make sure the nut doesn't come off.

Assuming I get the key and manage to fit the prop, I will just use the motor to get out of the anchorage and get into the marina, so even if I am missing a locking screw I should hopefully be fine. I guess I will order what is needed for the flexofold and either haul out or send a diver in to swap it back. Kind of think I'd rather haul out and watch it getting fitted


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Fair enough.

Good luck with it.

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Old 26-08-2015, 00:37   #53
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Re: My prop fell off... f.ck f.ck f.ck.

Quote:
Originally Posted by hoppy View Post
It's the rectangle pin that runs along the shaft...

or do you mean jam them in?
This is called a woodruff key. They are available in any number of standard sizes from f.eks electrical or hydraulic motor shops or the like.

Generally they only cost a couple of bucks although when they are stainless - they'll cost more.

You might try a shop that caters to commercial fishing boats. Fishing boats usually have any number of hydraulic motors with stainless steel shafts - and therefore stainless steel woodruff keys.


these guys carry them and they have shops at various locations. There is a shop finder on their webpage showing shops by zip code


cost: about 4 bucks

https://www.fastenal.com/products/details/0157591

Hope it helps

carsten
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Old 26-08-2015, 00:46   #54
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Re: My prop fell off... f.ck f.ck f.ck.

Quote:
Originally Posted by carstenb View Post
This is called a woodruff key. They are available in any number of standard sizes from f.eks electrical or hydraulic motor shops or the like.

Generally they only cost a couple of bucks although when they are stainless - they'll cost more.

You might try a shop that caters to commercial fishing boats. Fishing boats usually have any number of hydraulic motors with stainless steel shafts - and therefore stainless steel woodruff keys.


these guys carry them and they have shops at various locations. There is a shop finder on their webpage showing shops by zip code


cost: about 4 bucks

https://www.fastenal.com/products/details/0157591

Hope it helps

carsten
Sorry Hoppy

I didn't catch that you are in Greece - my mistake

You might try to find a wurth - they carry various shapes of keys for axels
Here's link
https://eshop.wuerth.de/is-bin/INTER...rchCategory=#/

By the way - if yours is a european boat - you'll need "Shape A" - see the link


good luck and definitely buy a lottery ticket - finding your prop means that just has to be your lucky day
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Old 26-08-2015, 01:30   #55
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Re: My prop fell off... f.ck f.ck f.ck.

Quote:
Originally Posted by hoppy View Post
Dived in this morning and there was no key on the shaft. So I'm at a nearby hotel waiting for a taxi.

At the end of the shaft there is a hole which may be threaded. I tried a couple of screws but none fitted. The nut has a small hole and I wonder if it's to secure the nut?

Assuming I get the key and manage to fit the prop, I will just use the motor to get out of the anchorage and get into the marina, so even if I am missing a locking screw I should hopefully be fine. I guess I will order what is needed for the flexofold and either haul out or send a diver in to swap it back. Kind of think I'd rather haul out and watch it getting fitted


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As Ann mentions the small hole in the shaft is likely for a cotter pin to make sure the nut for your fixed three blade prop doesn't fall off. Not sure about the hole in the nut but might be for the same.

Installation of the flexofold requires that the blades are installed after the shaft nut has been put on, which in your case might require a 30mm or larger socket.

Also I believe there are a total of eight screws including the shaft nut locking set screw and anode screw that require the thread locking compound. Take the prop apart and look at the drawing to make sure you have all the parts including the shaft nut locking set screw.

Installation isn't terribly complicated but you should follow the Flexofold instructions carefully. Lots of little parts involved. I personally would feel more comfortable doing it out of the water, but I am a klutz and not an experienced diver so a bit worried I would drop some of the little parts.
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Old 26-08-2015, 01:58   #56
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Re: My prop fell off... f.ck f.ck f.ck.

Quote:
Originally Posted by carstenb View Post
Sorry Hoppy

I didn't catch that you are in Greece - my mistake

You might try to find a wurth - they carry various shapes of keys for axels
Here's link
https://eshop.wuerth.de/is-bin/INTER...rchCategory=#/

By the way - if yours is a european boat - you'll need "Shape A" - see the link


good luck and definitely buy a lottery ticket - finding your prop means that just has to be your lucky day


Yes, mine is the A shape.

From an earlier post it seems like I need 8x8x60mm but in the wurths site they only had 8x7 in 60mm

I found a small engineering shop that looks like a junk yard. The guy will make 2 for me just incase I drop one when fitting it. Did not know what to say for material so I chose bronze. I did not think about the rounded shape.. He has my prop so it will fit that. Maybe I'll just shorten it a little if the square edges are a problem.

I will get the people at the marina to order a couple of the correct keys once I make it there.

I'm glad I decided to keep the old prop. If I understand it, to fit the flexofold back on I would have to take the blades off and then that has issues with the locking substance on the pins when installing underwater


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Old 26-08-2015, 02:54   #57
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Re: My prop fell off... f.ck f.ck f.ck.

Quote:
Originally Posted by hoppy View Post
Yes, mine is the A shape.

From an earlier post it seems like I need 8x8x60mm but in the wurths site they only had 8x7 in 60mm

I found a small engineering shop that looks like a junk yard. The guy will make 2 for me just incase I drop one when fitting it. Did not know what to say for material so I chose bronze. I did not think about the rounded shape.. He has my prop so it will fit that. Maybe I'll just shorten it a little if the square edges are a problem.

I will get the people at the marina to order a couple of the correct keys once I make it there.

I'm glad I decided to keep the old prop. If I understand it, to fit the flexofold back on I would have to take the blades off and then that has issues with the locking substance on the pins when installing underwater


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The key absorbs the torque an keeps the prop forom slipping around hte axel. The important part is that the width of hte key is the same as the slot it fits in. For a temporary fix a key with slightly less height is not a problem.

I don't know anything about fold-oflex - but I'd have to say I don't think I'd want to try to reassemble that under water.

I have the same shaft/key arrrangement as yours (Sun Fast 40.3) and the key on mine sits so tightly that I need to use a tiny chisel and a hammer to knock it free. I then use a bronze hammer lightly to set it when I put it back in.
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Old 26-08-2015, 04:24   #58
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Re: My prop fell off... f.ck f.ck f.ck.

I just got back to the boat wit the two keys. For some reason the guy made two different lengths. The shorter one fitted in nicely into the prop and the shaft grooves. I did a quick fit of the prop onto the shaft without the key as well just to see how easily it goes on. Now I know that it was easy then if I struggle with the key then I know I probably had to file down the key.

The key that fits measures 7.78x7.79x53.6 and does have the rounded edges. I think he's made a few in the past.

It's currently blowing up to 35 knots at the moment and the boat is hunting around a lot, so I'm going to wait before I put my scuba gear on. In these conditions I really don't want to be trying to handle the key and prop together and try and fit the washer and nut. Something will fall

Even with a max of 46 knots since I arrived, my Rocna Vulcan has been holding me well thankfully
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Old 26-08-2015, 04:34   #59
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Re: My prop fell off... f.ck f.ck f.ck.

Good luck Mr Hoppy.
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Old 26-08-2015, 04:43   #60
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Re: My prop fell off... f.ck f.ck f.ck.

We'll done Hoppy. It is not easy to find people to do this sort of work in a storage place when you don't speak the language.

I would coat the key in lots of grease. The thicker stuff is remarkably tenacious and does not wash off easily. It should hold the key in position underwater while you manoeuvre the prop in place.
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