Proper shaft alignment - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 21 Old 09-24-2002 Thread Starter
Junior Member
 
Join Date: Sep 2002
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Proper shaft alignment

I just replaced my cutlass bearing, and in doing so noticed the lock nut on my stuffing box was split. I have re-installed the stuffing box and placed a new cutlass bearing. I find that my shaft is aligning a bit high to the coupling about an 1". I can shove it down so that it will slide into the coupling, but am not sure if this is the right thing to do. Should I take off the stuffing box and ensure that the shaft is in the centre of the sern tube. Any tips would be appreciated.
Joshua Dawn is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 21 Old 09-24-2002
Member
 
Join Date: Jan 2002
Posts: 38
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Proper shaft alignment

You use a .005" feeler gauge all around between the faces of the coupling.

If the faces are flush with each other loosen the stuffing box and rotate it a bit while the flanges are engaged. That should aline things.

If there is .005" clearance or more on any side of the flange then engine alinement is needed
good luck - andy
lecomte38 is offline  
Quote Quick Reply Share with Facebook
post #3 of 21 Old 09-24-2002
Senior Nappy Headed Ho
 
Join Date: Feb 2001
Posts: 734
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Proper shaft alignment

This missalignment is normal as the hull takes on a different shape when in the water as compared to on the hard in a cradle or on jack stands. I would reassemble the flange to the transmission. Don’t forget to run the seizing wire through the heads of the hex head bolts. Do not attempt to align your engine on the hard. Align the engine only after the boat is in the water and the standing rigging is at the desired tension.

Denr is offline  
Quote Quick Reply Share with Facebook
post #4 of 21 Old 08-21-2006
Junior Member
 
Join Date: Apr 2006
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
May seem a stupid question to some, but how do you go about aligning an engine?
zerubb is offline  
Quote Quick Reply Share with Facebook
post #5 of 21 Old 08-22-2006
Member
 
bsfree's Avatar
 
Join Date: Oct 2001
Location: Marina Del Rey CA
Posts: 94
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
 
The only stupid question is the one you don't ask!
The engine is aligned by adjusting the nuts on the engine mounts. This will raise or lower the engine, and if you examine the mounts you should see there is provision for adjustment side to side as well. As Denr said, only make these adjustments in the water. Also, remember that the adjustments may be small, only a turn or two of the nuts alters things quite a lot, and check your flange distance for eveness often. You will see that the top nuts act as locking nuts and should be backed off a fair way, the nuts the engine sits on are the ones adjusted. You might want to mark the threads with colored marker so you can always return to where you started in case it all gets confusing. We all went through this the first time, and it really isn't too hard to do yourself.
Good luck
bsfree is offline  
Quote Quick Reply Share with Facebook
post #6 of 21 Old 08-23-2006
Senior Member
 
soul searcher's Avatar
 
Join Date: Jun 2006
Location: Ft. Walton Beach FL.
Posts: 488
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
remember one thing Its called an engine alighnment not a shaft alighnment.
never move a shaft to an engine.
The shaft sould be centered in the boat from the factory so unless you have had damage to any of those components dont move it just support it and yes where it is centered in the tube. if you use a v block you can go outside and on small safts you should be able to turn the shaft with your fingers easily.once you kow the shaft is centerd then align the engine to the
shaft. I usually start with a quarter then go to a dime then get out the feeler guages. You can get it close on land and fine tune in the water.
soul searcher is offline  
Quote Quick Reply Share with Facebook
post #7 of 21 Old 08-23-2006
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 14 Times in 12 Posts
Rep Power: 14
         
Soul searcher's point is a very good one... moving the shaft can cause it to be misaligned in the strut or cutless bearing, which will lead to accellerated wear on the shaft, strut and cutless bearing, and an additional load on the engine.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #8 of 21 Old 08-23-2006
Senior Member
 
Gene T's Avatar
 
Join Date: May 2006
Location: Left Coast USA
Posts: 666
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
 
I generally find I need to lift the shaft a bit to be in the center of the tube. Then align the engine to the shaft. I use an Allen wrench to check clearances. I find the shape handy for telling how much off you are by just turning the wrench back and forth to check play. This can be a lot of work if you are doing it alone, (depends on access) and I find the allen wrench speeds up the process a lot. Don't forget to rotate the shaft 180 degrees and recheck the alignment.
Gene T is offline  
Quote Quick Reply Share with Facebook
post #9 of 21 Old 04-13-2008
Oday30!
 
deniseO30's Avatar
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,914
Thanks: 55
Thanked 125 Times in 114 Posts
Rep Power: 10
   
I'd like to revive this thread. I'm ready to do the engine alignment now that the shaft, pss seal, cutlass and things are all back in the boat. still on the hard but I would like to get some practice doing it. It "looks" pretty well centered and the hubs also "look" even on all for points.

Also.. where do I find new set screws with the holes drilled for wire? The bolts for the hub to transmission need replacement also. what should we use for those, stainless fine thread?

thanks all!

Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

My last project!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


My boat is sold!
deniseO30 is offline  
Quote Quick Reply Share with Facebook
post #10 of 21 Old 04-14-2008
Senior Member
 
Omatako's Avatar
 
Join Date: Sep 2003
Location: Auckland New Zealand
Posts: 2,536
Thanks: 1
Thanked 32 Times in 29 Posts
Rep Power: 12
 
FWIW, when I align a shaft there are two things of importance:
  • The shaft must come up and align from a height perspective as exactly as possible without any pressure applied. So the bolts should slide in effortlessly in a totally natural state of rest.
  • When offering one flange up to the other, the alignment is critical. I measure it with a feeler guage and like to get it to within 0.005" . Anything more than this will cause a vibration even if to you it is imperceptible.
And such a degree of accuracy is not hard to achieve so I always do it.

Andre
Omatako is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Shaft replacement or ''the shaft''? foxglove Gear & Maintenance 4 08-18-2006 11:16 PM
Shaft Zinc FlySwat Gear & Maintenance 6 06-11-2005 04:15 PM
yet more proper course questions dpboatnut Racing 7 09-29-2004 07:41 AM
Packless Shaft Seal (PSS) bkdehuff General Discussion (sailing related) 4 04-20-2004 05:41 PM
shaft position concerns Morgan OI 41 sailnby Gear & Maintenance 4 01-13-2002 09:20 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome