Check your alignment
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=41834
Printed Date: May-22-2024 at 9:33pm
Topic: Check your alignment
Posted By: 8122pbrainard
Subject: Check your alignment
Date Posted: August-27-2017 at 7:21am
A friend of mine hadn't checked his alignment and this is a good example of what happens: Luckily he found the problem before the shaft went aft (no safety collar in 70) hitting the rudder. For those who aren't familiar with the problem, misalignment between the prop shaft and trans coupling causes movement at the interference fit between the two. This causes https://en.wikipedia.org/wiki/Fretting" rel="nofollow - fretting to the point were only the key and safety set screws are transmitting the power to the shaft and holding the two together. A black smut around the shaft at the coupling bore is a good indicator of fretting. Check your alignment! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Replies:
Posted By: phatsat67
Date Posted: August-27-2017 at 9:16am
| Don't fret Pete. My alignment is perfect. |
Posted By: 8122pbrainard
Date Posted: August-27-2017 at 9:21am
My only fretting is when Ken works me over!!   ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
phatsat67 wrote:Posted By: KENO
Date Posted: August-27-2017 at 9:32am
Not really aimed at you Pete but, I was gonna say why does this always happen to "a friend"? Or why does everything get blamed on the previous owner? Or the car mechanic? Or one of your kids? Or that rock that's been in the same spot for a million years? Or if you're really asking for trouble, the wife?
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Posted By: Duane in Indy
Date Posted: August-27-2017 at 10:47am
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So Pete, are you going to use your ability and knowledge and make that shaft into a double taper shaft and save your friend some cash or let him go buy a complete new assembly? BTW don't forget to lap the new one in. ------------- Keep it as original as YOU want it 1978 Mustang (modified) |
Posted By: Duane in Indy
Date Posted: August-27-2017 at 11:05am
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With alignment off that bad to create that much damage have you checked to see what caused the misalignment?? Has he checked the integrity of his stringers yet?? ------------- Keep it as original as YOU want it 1978 Mustang (modified) |
Posted By: SNobsessed
Date Posted: August-27-2017 at 11:40am
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Better check the tranny rear bearing too. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: 8122pbrainard
Date Posted: August-27-2017 at 1:11pm
Duane, The stringers in this case are a know problem. I don't feel the alignment was off "that bad" but it was the amount of time the boat has been run without an alignment check. I checked with this friend and he told me it was alright to let it be known who he is so, it's Charlie's (brady). He has never checked alignment in over 40 years!! The bad shaft and coupling was the reason he was with me in the Tique on the Three Lakes mini and not in his 70 Cuda. He's already ordered an ARE shaft. Chris, The output bearing in the Velvet is still good. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Duane in Indy
Date Posted: August-27-2017 at 1:16pm
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If I can help out just holler ------------- Keep it as original as YOU want it 1978 Mustang (modified) |
Posted By: Gary S
Date Posted: August-27-2017 at 1:37pm
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Hope he orders a safety collar too Pete,McMaster Carr has them After seeing what happened to Dave Gwinn's Southwind I put them on anything that didn't have one. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: 8122pbrainard
Date Posted: August-27-2017 at 2:26pm
The collar has been discussed but there's not much room between the trans coupling and the shaft gland packing nut on the 1st gen Cuda. In fact, the last Cuda up here that got the ARE, the socket to draw the shaft into the coupling taper had to be ground down in length! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: 81nautique
Date Posted: August-28-2017 at 10:51am
| Pete if you have enough room to use that installation socket you will be able to install a split safety collar once you pull the couplers tight. That's what I had to do on the Hurricane to get on one, Mcmaster will have one for about $10-15. |
Posted By: Duane in Indy
Date Posted: August-28-2017 at 11:11am
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This is what I used on the Mustang http://www.ebay.com/itm/1-Inch-Stainless-Steel-Double-Split-Shaft-Collar-2SSC-100-/282307507033?hash=item41bad6b359:g:LwwAAOSw6n5XtkIw" rel="nofollow - splt collar http://www.ebay.com/itm/1-Stainless-Steel-Double-Split-Shaft-Collar-2-Piece-SS-Shaft-Collar-USBB/232313792319?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D45727%26meid%3D9026bf41620a46af93fe47d1e1717380%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D282307507033&_trksid=p2047675.c100005.m1851" rel="nofollow - or better price ------------- Keep it as original as YOU want it 1978 Mustang (modified) |
Posted By: DrCC
Date Posted: August-28-2017 at 1:30pm
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I could use a good straight stainless one inch by thirty six go kart axle. ------------- Keep it....from sinkin' |
Posted By: 8122pbrainard
Date Posted: September-08-2017 at 9:55am
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Charlie's back home in St. Paul so UPS dropped off his new shaft at my house and I'm impressed. In another thread, it was discussed that ARE shafts have been breaking at the woodruff key at the trans end taper. I understand they made a design change which hopefully will fix the problem. Anyway, I mentioned this to Charlie so he decided to get in touch with General Propeller regarding their double taper system. First, it's not an "off the shelf" shaft and coupling. GP requested lots of measuring especially at the trans end where clearance between the coupling and packing gland nut is limited. GP then selects a coupling to suit giving them as much taper length as possible. The ARE's have a rather short and steep taper which from an engineering standpoint has always been a concern of mine. GP also uses a 1/4" square key minimizing material needed to be removed out of the shaft compared to a woodruff key that goes deeper. I assume going to a 1/4" key is what ARE has done with their engineering change?? The General Propeller double taper shaft and coupling   ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: 8122pbrainard
Date Posted: September-08-2017 at 10:50am
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I wanted to check how close GP's shaft taper was to their coupling so I got out the Prussian Blue. On the ARE's I've installed, their tapers were off and required lapping. Here's GP's - perfect!!  ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: gt40KS
Date Posted: September-08-2017 at 3:23pm
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Good info Pete, I may be in need of it before long. Visually checking my alignment a couple weeks ago after noticing your post, I discovered a slight wobble in the prop shaft. I'll be taking it apart this weekend and seeing if it is a misalignment or a bent shaft. Hopefully just an alignment issue since there's already several other items on my list to repair and/ or replace. ------------- JCCI 1995 Ski Nautique GT40 |
Posted By: 8122pbrainard
Date Posted: September-08-2017 at 3:27pm
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Joe, Have you seen the alignment video yet? If not, a link is in the FAQ thread in the maintenance section. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: gt40KS
Date Posted: September-08-2017 at 4:48pm
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Yes, I caught the link in a previous post and watched it that night. Mostly very logical stuff, but if you've never done it before the video is a great tool to make sure you don't forget anything. Lots of great tips though ------------- JCCI 1995 Ski Nautique GT40 |