Shaft coupling loose bolts - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
 Not a Member? 
  #1  
Old 11-22-2006
Member
 
Join Date: Apr 2006
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Edo Kazumichi is on a distinguished road
Shaft coupling loose bolts

I was examining the drive shaft of my new very old boat and I noticed something peculiar. There were six bolts in the coupling. Every other one went through some sort of rubber bushing. (First question - what are these?) Between these were bolts through both plates but they were NOT TIGHTENED DOWN. The nuts had been tightened down as far as the threads went but this was not far enough to actually exert any pressure to hold the plates together. They were just hanging there.

Second question: What in the world?!? Was somebody snorting epoxy when they were installing the coupling? Surely this can't be normal. It seems so unbelievable that someone would do this that I just had to ask.
Reply With Quote Share with Facebook
  #2  
Old 11-22-2006
Senior Member
 
Join Date: Jun 2006
Posts: 2,394
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 10
cardiacpaul is a jewel in the rough cardiacpaul is a jewel in the rough cardiacpaul is a jewel in the rough
It'll help if you tell us what great old boat you're now tied to!


the rubber thingy between the two metal pieces is a "shock absorber/very slight minimal alignment devise". think of it as like of like a automotive driveshaft universal joint.
The bolts are "loose" because the rubber has deteriorated.
The joint should be "tight" but not binding.

depending on the type of "joint" you have you can have bolts threading into each side of the joint, or, all of them being thru bolts with bushings inside of the rubber piece, or a combination of the 2. Or something else all together
The bolts should have "shoulders" on them, meaning they aren't threaded the full length of the bolt.

Oh, by the way, welcome to the joys of boat ownership/maintenence.
__________________
We are not primarily on earth to see through one another, but to see one another through

Some people are like slinkies: not really good for anything... but you can't help laughing when you push them down the stairs
Reply With Quote Share with Facebook
  #3  
Old 11-22-2006
billangiep's Avatar
Senior Member
 
Join Date: Dec 2003
Location: Florida Gulf Coast
Posts: 295
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
billangiep is on a distinguished road
Sounds like A Flexable shaft coupling or what they call a drive shaft saver? http://www.pyiinc.com/?section=brows...ku=910002&sn=1
Reply With Quote Share with Facebook
  #4  
Old 11-23-2006
Member
 
Join Date: Apr 2006
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Edo Kazumichi is on a distinguished road
It's an Ericson 32 with a Kubota 3-banger.

I don't think I made it clear. Every other bolt was tightened down to the shoulder but the shoulder did not end inside the coupling. Picture the two sides of the coupling as a wall. Looking left to right with x-ray vision: bolthead, prop side of coupling, transmision side of coupling, 3/4 OF AN INCH OF SHOULDER, nut tightened to the end of the shoulder putting it 3/4 OF AN INCH away from the wall. Bolt was thus free to move back and forth through the hole 3/4 OF AN INCH.

You're probably having a hard time picturing it because it is so unbelievable that anyone would leave it like that at installation.
Reply With Quote Share with Facebook
  #5  
Old 11-23-2006
Member
 
Join Date: Apr 2006
Posts: 57
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Edo Kazumichi is on a distinguished road
It's an Ericson 32 with a Kubota 3-banger.

I don't think I made it clear. Every other bolt was tightened down to the shoulder but the shoulder did not end inside the coupling. Picture the two sides of the coupling as a wall. Looking left to right with x-ray vision: bolthead, prop side of coupling, transmision side of coupling, 3/4 OF AN INCH OF SHOULDER, nut tightened to the end of the shoulder putting it 3/4 OF AN INCH away from the wall. Bolt was thus free to move back and forth through the hole 3/4 OF AN INCH.

You're probably having a hard time picturing it because it is so unbelievable that anyone would leave it like that at installation.
Reply With Quote Share with Facebook
  #6  
Old 11-23-2006
Senior Member
 
Join Date: Jun 2006
Posts: 2,394
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 10
cardiacpaul is a jewel in the rough cardiacpaul is a jewel in the rough cardiacpaul is a jewel in the rough
ahhhh... got it...i think... so looks like the vibration/insulation/alignment-ruber thingy in the middle wasn't thick enough, or not there, or ripped out, or they just put in too long of a bolt? duh?
__________________
We are not primarily on earth to see through one another, but to see one another through

Some people are like slinkies: not really good for anything... but you can't help laughing when you push them down the stairs
Reply With Quote Share with Facebook
  #7  
Old 11-23-2006
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 8 Times in 8 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Again, a photo of the beast would help, instead of trying to use words, where a photo would make it very clear and unambiguous, provided it is a good photo.
__________________
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.
Reply With Quote Share with Facebook
  #8  
Old 11-23-2006
pigslo's Avatar
Senior Member
 
Join Date: Nov 2004
Posts: 804
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 10
pigslo is on a distinguished road
I have a flexible coupling on mine and this description sounds close. Search the term on google and you will find pics. The brand i have is R&D and they have a website www.pyiinc.com
Reply With Quote Share with Facebook
  #9  
Old 11-24-2006
Member
 
Join Date: Jan 2001
Posts: 52
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 14
wlcoxe is on a distinguished road
Transmission coupling bolts

I discovered a problem in my bolts the hard way when leaving my slip. The transmission went into forward and reverse properly with no effect. After the foredeck fire drill to set the anchor, I found that all four bolts (1989 ODay 40, Westerbeke 46) had spun out. I managed to salvage three sets from the bilge, which was enogh to get back to the slip. Next day, an enitire new set of bolts and washers were installed, and I check them regularly, although no sign of loosening has occurred-yet. Previous boat was a saildrive, so very few similarities. There was no compression piece between the flanges, but I will check the manual (again) now that I recognize the possibility that one should be there.
Bill Coxe, O40, New London, CT
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Flexible shaft coupling zerubb Gear & Maintenance 1 08-18-2006 11:13 PM
prop shaft coupling kurt crowley Atomic 4 2 06-27-2006 03:45 PM
Keel Bolt Concerns Don Casey Gear and Maintenance Articles 0 10-12-2003 08:00 PM
The Stuffing Box and Stern Tube Tom Wood Gear and Maintenance Articles 0 04-27-1999 08:00 PM


All times are GMT -4. The time now is 05:30 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012