proper prop installation |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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ah yes, lapping is also recommended, you want at least 80% contact on the surfaces and with blueing the prop is the method to determine the contact, once the contact is achieved then you want to advance the prop onto the shaft, really i was thinking about this and i dont see any reason why you could do the die procedure, lap it and then put the prop in the oven at 400 degrees and then advance your prop quickly. these props do spin engine speed or a tad less so getting it up on the shaft seated is important...thats me though.
but never skip the fitting procedure which includes die and lapping it in, if i had the shaft out, which most of the time i did, I would dangerously put the shaft in the lathe and spin it slowly to lap the prop in |
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"the things you own will start to own you"
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TX Foilhead
Grand Poobah Joined: February-01-2009 Location: Kingsland TX Status: Offline Points: 2076 |
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Pete, my thinking was that if they were roughly equal in effectiveness then it would give people another option if they could only do one and already had a propane torch. I agree its not a good idea to break out the acetalyne torch and heat your new prop until its almost molten so you can push it all the way to the strut.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Don,
No problem with thinking of other ways to seat a prop but I'd stay with the lapping. Yes, I'd hate to see someone getting the prop too hot (heat and a slow cool anneals brass alloys). As Eric mentioned the "sweating" is the indicator of how hot you're getting the prop. A first timer may not catch on. |
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Gmoney
Newbie Joined: May-20-2012 Location: lake tawakoni Status: Offline Points: 32 |
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Great thread. We have a brand new prop hanging on the wall, just in case. It will get lapped in for sure.
GMoney |
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"Hit it"
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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i always forget about the dummy factor lol, I really can picture now someone really heating up the prop, thats the reason i suggested 350 or 400 in the oven.
really the combination of the 3, die lap and sweat, i would concur is probably the correct way to install a prop, in reality though i dont know how important it would be to sweat the prop at this point, obviously if you want it up on the taper this would be the way to do it |
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"the things you own will start to own you"
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mrwillya
Newbie Joined: August-04-2011 Location: Iowa Status: Offline Points: 33 |
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Took the Ski Supreme out this weekend with the new ACME 543 and WOW what a difference! I didn't notice it until I was pulled behind it on skis. It almost pulled the rope out of my hand! I then had someone else drive and really felt the faster hole shot. I guess while I drove it it was tougher to notice the difference. Sounds odd, I know!
Thanks for your prop help. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Eric, With the lap and sweat, you'll need one of these to get it off!! I'd have to borrow our 55 ton from work! |
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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New twist on an old subject:
Does a prop need to be re-lapped when it goes on a different boat? I would think not, but maybe there could be a slight difference in taper. Pete - What do you think? |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Chris,
I say yes since the whole idea is to precisely match the two tapers. Yes, machining is pretty accurate but I still suggest lapping. It doesn't take much for the tapers to be off .0005" over the length of the taper. |
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Well, it looks some props are changing hands,. I am getting a used one myself.
I'll do the lap just to be safe. Hopefully this thread will help others know about the technique. |
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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4mor
Newbie Joined: December-07-2012 Location: Peoria, Arizona Status: Offline Points: 30 |
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Wow!! Never knew that mounting a prop could be so complicated. My '66 S-N came with a bronze prop. At the time, I bought a spare since my boat (and my roommates boat) were to be used by various ski clubs in Florida for their tournaments. I have interchanged the two props at least a dozen times over the past 48 years and in all that time, I have never "blued" the shaft or for that matter, even cleaned it. Am I doing something wrong or am I just lucky .
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4mor
Newbie Joined: December-07-2012 Location: Peoria, Arizona Status: Offline Points: 30 |
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Wow!! Never knew that mounting a prop could be so complicated. My '66 S-N came with a bronze prop. At the time, I bought a spare since my boat (and my roommates boat) were to be used by various ski clubs in Florida for their tournaments. I have interchanged the two props at least a dozen times over the past 48 years and in all that time, I have never "blued" the shaft or for that matter, even cleaned it. Am I doing something wrong or am I just lucky .
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Blueing is an option. It's just an indicator of high and low spots. It's the lapping that is key to matching the taper. Yes, many have gotten away without lapping. Most have been lucky but there are others who have lost props. |
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kapla
Grand Poobah Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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Tell me, lost the cstle nut and the prop remain on its place!
Good i followed this instructions |
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<a href="">1992 ski nautique
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Fitted my new 1442 the other day. Checked it with blue compound almost perfect contact on taper. Still gave it a quick lap with the cutting compound.
ACME are now putting a note in with their props to check the taper fit. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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Bones71
Senior Member Joined: March-09-2013 Location: Bettendorf Ia Status: Offline Points: 334 |
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Guys, if I can't find Prussian blue what else could I use? I know they can get it for me but is there another product I could use? Thanks, Tony.
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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Tony, I have found my own blood to be a suitable substitute...
It has gotten a little thinner after 30 years in S Florida and seems to flow nicely over machined surfaces... |
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Jesus was a bare-footer.............
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Bones71
Senior Member Joined: March-09-2013 Location: Bettendorf Ia Status: Offline Points: 334 |
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Been there. I went to Napa and I'll get the Prussian tomorrow. I thought I would have to wait. Thanks, Tony.
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Tony - The grinding compound leaves a satin finish. I have not used the blue. I think the bogey is 90% cleanup.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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gR@HaM
Platinum Member Joined: May-01-2012 Location: UK Status: Offline Points: 1265 |
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Old thread I know, but couldnt see any mention of checking for flat spots on the prop taper?
It's taken me a considerable amount of lapping and am currently at ~95% contact with the prop. The shaft taper is spot on.. |
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'82 Ski Tique
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baitkiller
Platinum Member Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
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95%? Bolt it up and splash the damn thing already!
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Jesus was a bare-footer.............
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IAughtNaut
Grand Poobah Joined: August-22-2010 Location: TN Status: Offline Points: 2568 |
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You're probably good...there's a lot of guys who have never lapped a prop and never have any problems. You hit the toilet 95% of the time and your toes are going to stay pretty dry.
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gR@HaM
Platinum Member Joined: May-01-2012 Location: UK Status: Offline Points: 1265 |
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Thanks fellas its getting there slowly |
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'82 Ski Tique
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gR@HaM
Platinum Member Joined: May-01-2012 Location: UK Status: Offline Points: 1265 |
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'82 Ski Tique
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Yes, there are plenty of people who have never lapped a prop but if you read this thread thoroughly you will understand that was with the old props and not the CNC machined props. Props used to be reamed but the CNC props are not. Yes, CNC is accurate but not to the extent of the greatest fit. Why do you think Morris tapers are ground? Why do you think Acme even recommends lapping. |
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Graham - My prop's taper (after lapping) looked exactly like what you ended up with. I got to the point of diminishing returns & just went with it. It hasn't come loose, been 5+ years.
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“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
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gR@HaM
Platinum Member Joined: May-01-2012 Location: UK Status: Offline Points: 1265 |
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That's good to know, thanks
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'82 Ski Tique
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6150 |
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Both Acmes I have lapped had a run up the side. The line was uniform and they both stay on the taper just fine.
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NCH20SKIER
Grand Poobah Joined: December-16-2004 Location: United States Status: Offline Points: 2207 |
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Suggestion - if your taking the time to lap the shaft above spend the extra bucks and get the correct sized wrench and sell the adjustable to those working on mastercrafts. Got to say I was very surprised to see such a tool in Pete's hand
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'05 206 Limited
'88 BFN |
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Russman
Groupie Joined: May-11-2015 Location: Ohio Status: Offline Points: 66 |
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there is another thread on dumb things said about boats. Well!, I have potentially a dumb question on this topic.
I went to NAPA and had to order the Prussian Blue and the Valve Grinding Compound. When I did i was asked (Water or grease base) then was told that the grease was no longer available. So, the question I have is "is the water based Valve Grinding Compound effective for the lapping prior to a new prop install.?" Thanks for you response. |
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1989 2001 SN / Prior 1978 Cobalt 18
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