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Old 11-17-2018, 03:35 PM   #1
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Prop removal and scan

The PO of my boat put multiple coatings on the props and shafts. I have no idea what the coatings are but they are flaking off badly and have left a very rough surface on the props. I am going to have them scanned to see how true they are. I have some minor vibrations on the starboard side at higher RPMs. The prop shop sent me a puller but it would walk off the end of the shaft repeatedly. So I made my own puller that worked very well. I used 3/8” steel plate and 5/8” grade 8 bolts. I also had to buy a 24” adjustable wrench in order to remove the 2 1/2” prop nuts. Interesting that the port shaft is left hand thread... guess how long it took to figure that out. My keys and keyway are also different than I expected in that the keys are rounded on both ends and the keyway fits the keys exactly. I have not been able to remove the keys from the shaft so far. I am going to take the props in next week.
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Old 11-17-2018, 04:23 PM   #2
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proper keys are rounded so they don't as easily ride up the end of the keyway.
Square keys work with a little more care.
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Old 11-17-2018, 07:18 PM   #3
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I don't know what those coatings were but I gotta say I don't think I've ever seen a prop surface so f'd up. Those things look like they've been in salt water for many years.


If you're on the hard right now (pulled for the winter???) I'd suggest getting down there with a sander and get the rest of those coatings off the rest of the running gear.
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Old 11-17-2018, 07:26 PM   #4
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Is that grease on the shaft? If so, do not use grease on the taper when reinstalling the prop. A very light film of oil may be used. But not grease.
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Old 11-17-2018, 07:55 PM   #5
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As far as the key goes, it has a radiused end because the keyseat in the shaft is endmilled (with a vertical cutter) parrallel to the taper in accordance with the standards ( ABYC P6 and SAE 755) to have a radiused end as well. Which makes a lot of sense, because if the keyseat was cut with a horizontal mill, it would have a "ramp" at the end which the key would possibly ride up and may prevent the propeller hub from sliding all the way on the shaft taper.
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Old 11-17-2018, 07:59 PM   #6
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My prop kind of looked like that when I pulled it after I used zinc primer as an antifouling on it once.
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Old 11-17-2018, 08:24 PM   #7
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[QUOTE=Comodave;715564]The prop shop sent me a puller but it would walk off the end of the shaft repeatedly. So I made my own puller that worked very well. I used 3/8” steel plate and 5/8” grade 8 bolts.


Hi Comodave,

I made almost the identical puller years ago. Simple, cheap and effective. It is at our Yacht Club now as it gets more use that way.

Rob
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Old 11-17-2018, 08:52 PM   #8
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I wouldn't worry about cleaning it up. If you take it in for NDT scan and balance, they will clean it up for you. After that, your bottom cleaning diver should keep the prop pretty clean.
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Old 11-17-2018, 09:48 PM   #9
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Yes, they are going to clean the props up when they scan them. That may be the vibration that I noticed. No, I will not grease the shafts. There should not be any grease. If it was greased it didn’t help to get them off. One was really hard to get off, I was about to give up when it popped off with a bang. The other prop was not too bad to get off. I would have liked to get the keys out but I am not sure if I will be able to or not. I wanted to lap the prop when I reinstalled them. We don’t have the bottom cleaned here except when they oressure wash it while hauling for the winter.
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Old 11-18-2018, 06:42 AM   #10
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Yes, they are going to clean the props up when they scan them. That may be the vibration that I noticed. No, I will not grease the shafts. There should not be any grease. If it was greased it didn’t help to get them off. One was really hard to get off, I was about to give up when it popped off with a bang. The other prop was not too bad to get off. I would have liked to get the keys out but I am not sure if I will be able to or not. I wanted to lap the prop when I reinstalled them. We don’t have the bottom cleaned here except when they oressure wash it while hauling for the winter.
OUCH!! No bottom cleaners? Ask around. I know in this part of FL, I think we have more divers than necessary. Perhaps you can capture one and take him north?
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Old 11-18-2018, 06:43 AM   #11
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I wanted to lap the prop when I reinstalled them. We don’t have the bottom cleaned here except when they oressure wash it while hauling for the winter.
What part are you going to lap?
Remember, props are supposed to be a tight fit on the shaft.
The divers here will gladly remove the props while the boat is in the water. For an additional fee.
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Old 11-18-2018, 08:42 AM   #12
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I believe he would like to remove the key and lap the prop hub to the shaft taper. Great idea. A bluing check after is a good idea too. If more people did this there would be less need for hammers and prop pullers upon disassembly.
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Old 11-18-2018, 09:47 AM   #13
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I believe he would like to remove the key and lap the prop hub to the shaft taper. Great idea. A bluing check after is a good idea too. If more people did this there would be less need for hammers and prop pullers upon disassembly.
A 3 finger wheel pullings work better than a hammer to POP the wheel.

I do like the bluing check.
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Old 11-18-2018, 12:15 PM   #14
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Actually we don’t need a diver to clean the bottom here, not much of anything builds up over the summer just a bit of slime that comes off with a pressure wash on haul out.

Yes, I wanted to lap the prop and shaft and check with machinist blueing to check the fit. However if I can’t get the keys out that won’t be possible.
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Old 11-18-2018, 01:44 PM   #15
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The keys will come out. Be creative. If you damage them you can buy key stock cheap enough via McMaster carr online.
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Old 11-18-2018, 02:20 PM   #16
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The keys will come out. Be creative. If you damage them you can buy key stock cheap enough via McMaster carr online.
Just remember not to damage the shaft and seating area.
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