Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 21-02-2008, 16:43   #1
Registered User

Join Date: Feb 2008
Posts: 1
flexible shaft coupling for short shaft

I have a HC 33 that always has a mis alignment problem. anyone out there have an idea on a flexible coupling for a short shaft.
melemakani is offline   Reply With Quote
Old 21-02-2008, 17:03   #2
Registered User
 
delmarrey's Avatar

Join Date: Mar 2003
Location: Philippines in the winters
Boat: It’s in French Polynesia now
Posts: 11,368
Images: 122
It would probably be more in your interest to fix the alignment problem. A misalignment will even wear a flex coupler if off too far.

If it will not stay aligned once adjusted you could be in for an unpleasant surprise down the road.

Flex couplers are more for an engines torque and cranking motions, like with some diesels that shake a lot.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
The measure of a man is how he navigates to a proper shore in the midst of a storm!
delmarrey is offline   Reply With Quote
Old 21-02-2008, 18:46   #3
Registered User
 
jrd22's Avatar

Join Date: Jan 2008
Location: San Juan Islands, WA
Boat: 1988 Brewer Three Seas 40' Pilothouse
Posts: 253
Drivelines Northwest (Seattle) makes some kind of flexible coupling, I think it can tolerate some misalingnment. I would agree with the post above that you should do everything possible to align the engine properly first before resorting to a coupling to cover up the problem.

John
__________________
John Davidson
S/V Laurie Anne
1988 40' Brewer Pilothouse
jrd22 is offline   Reply With Quote
Old 21-02-2008, 21:25   #4
Registered User
 
SkiprJohn's Avatar

Join Date: May 2006
Location: Nicholasville, Kentucky
Boat: 15 foot Canoe
Posts: 14,191
Aloha Melemakani,
Yes, check engine mounts and do a realignment. There's got to be a reason why it isn't aligned. If you have flexible engine mounts then you should also have a flexible coupling.
I got my flexible coupling from West Marine and they got the right one to me on the second try.
JohnL
SkiprJohn is offline   Reply With Quote
Old 22-12-2015, 04:13   #5
Registered User

Join Date: Aug 2008
Location: Darwin, Australia
Boat: CT34
Posts: 30
Re: flexible shaft coupling for short shaft

Quote:
Originally Posted by SkiprJohn View Post
Aloha Melemakani,
Yes, check engine mounts and do a realignment. There's got to be a reason why it isn't aligned. If you have flexible engine mounts then you should also have a flexible coupling.
I got my flexible coupling from West Marine and they got the right one to me on the second try.
JohnL
Absolutely right Skipper John and everyone else that recommends engine mounts check and realignment

Please look at "Shaft is too short" thread for my recommends on machining a spacer out of nylon. That will help but the misalignment has to be attended to first.

I have replaced 3 engines and had to work up from a new engine bed on each. One was a 135 hp Perkins. This I installed without flexible engine mounts. I used stainless shims to adjust for height and angle. Then bolted the lot down tight.

I mention this as it may be an appropriate solution for you.

In any case the start of a realignment is loosening or even removing the coupling bolts. Then the shaft can be moved backwards and forwards easily.
.
Have the shaft coupling just close enough to be touching the engine coupling.
The misalignment then will be clearly visible.
.
Is the shaft coupling higher that the engine coupling??
Does one side of the coupling have a bigger gap than the other?
Does the top of the coupling have the same gap as the bottom?

If you would like more info please ask.
I just do not want to bore readers if no interest.

Cheers from the top end of down under.
julius222 is offline   Reply With Quote
Old 22-12-2015, 04:57   #6
Registered User

Join Date: Aug 2008
Location: Darwin, Australia
Boat: CT34
Posts: 30
Re: flexible shaft coupling for short shaft

Just had a thought

Once you remove the coupling bolts. rotate the shaft. If the shaft or the shaft coupling is out of true it will show on rotation as the shaft coupling will not be in the same position relative to the engine coupling.

If this is the case, no amount of aligning will help. A micrometer dial gauge can tell you if the shaft is true or not.

Cheers from the Top End of Down Under
julius222 is offline   Reply With Quote
Old 22-12-2015, 05:16   #7
Moderator Emeritus
 
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: Fort Lauderdale, FL
Boat: 48 Wauquiez Pilot Saloon
Posts: 5,975
Re: flexible shaft coupling for short shaft

Welcome to CF Melemakani... !

Good advice above... Align so you don't need a flexible coupler, and you'll be good to use one!
__________________
In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Reply

Tags
short shaft

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shaft Coupling Removal markpj23 Propellers & Drive Systems 1 11-02-2008 19:44
shaft lock captden Construction, Maintenance & Refit 11 23-06-2007 14:47
Shaft Seal ?'S westykids Propellers & Drive Systems 14 26-03-2007 19:40
Flexible Shaft Coupling SkiprJohn Propellers & Drive Systems 51 25-12-2006 06:39
My Cadillac C/V shaft! irwinsailor Construction, Maintenance & Refit 7 14-10-2006 12:15

Advertise Here


All times are GMT -7. The time now is 22:27.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.