Reply
 
Thread Tools Display Modes
 
Old 01-24-2015, 08:52 PM   #21
Senior Member
 
City: Madisonville
Country: USA
Vessel Name: Nirvana
Vessel Model: 41' Litton
Join Date: Feb 2011
Posts: 144
This is great info Terry. Seal is on the way from AD. I ordered a 3/4 drive socket set today. Didn't have a socket that large in my tools. I'll keep you posted.
__________________
Advertisement

__________________
41' Litton
Dixie Life is online now   Reply With Quote
Old 01-25-2015, 08:35 AM   #22
Veteran Member
 
Driftless's Avatar
 
City: Taunton, Mass.
Country: USA
Vessel Name: Rise & Shine
Vessel Model: Prairie 29
Join Date: Jan 2015
Posts: 69
Great information, guys.

I've done a couple of repowers, and when we found old style packing had worn grooves in shafts, on two occasions, we installed Dripless seals which positions the shaft collar further toward the engine than the original packing. Thus the dripless seal performs as-designed with no compromise due to the damaged surface at the original packing position.

When I repowered Driftless, I was replacing the original 25mm shaft with a 1" so everything had to be new regardless. The good news it was that being only 1" diameter, it was a really small shaft anyway and nothing was very expensive.

The shaft, screw and all the related hardware (including the drive saver coupling) cost more than the new Isuzu diesel engine, which I got through a stroke of luck for $2,000.

Thanks!

JS
__________________

__________________
John R. Stewart
"Rise 'n Shine" Prairie-29, (formerly) "Driftless" Albin-25, Hull number 737
Dighton, Massachusetts, USA
Driftless is offline   Reply With Quote
Old 02-03-2015, 11:59 AM   #23
Senior Member
 
City: Madisonville
Country: USA
Vessel Name: Nirvana
Vessel Model: 41' Litton
Join Date: Feb 2011
Posts: 144
Meridian,
You were on the mark. The nut was only finger tight. I followed your instructions; RTV, 200+ torque, etc. Haven't taken a test run yet; ugly weather. But, not a drop of fluid in the pan after several days now. A couple questions though. One, the nut took a 1 11/16 socket but has no built on washer. It looks just like the lower nut in the post(#20) above. Do you think a yard guy could have installed the wrong nut? Second, do you know how much alignment error is acceptable on a Federal Flex Drive Coupling. I called the factory but the guy refused to give an answer. He said, ".003 on direct shaft coupling. But with rubber mounts on the Federal you have much more flex." Still, no number! My tranny is about .015-.020 out at the 8:00 position looking from the rear. That's as close as I can get it without major work. There's no vibration so the .015 may be OK with the rubber bushings.
__________________
41' Litton
Dixie Life is online now   Reply With Quote
Old 02-03-2015, 01:26 PM   #24
Guru
 
City: Full Time Cruising East Coast
Country: USA
Vessel Name: Meridian
Vessel Model: Krogen-42
Join Date: Aug 2011
Posts: 756
I wonder if he used a used nut. When I took mine off, the washer had separated from the nut. Did he use any kind of washer? Brian at AD said it was a one-time use nut. I guess you can just keep an eye on it. No idea about the flex drive.
__________________
-------------------------
Terry
Meridian
KK-42097
meridian is offline   Reply With Quote
Old 02-03-2015, 03:05 PM   #25
Guru
 
LarryM's Avatar
 
City: League City, TX
Country: USA
Vessel Name: Pelago
Vessel Model: Wellcraft 3300 Coastal
Join Date: Aug 2011
Posts: 843
Quote:
Originally Posted by dhiggins View Post
Meridian,
You were on the mark. The nut was only finger tight. I followed your instructions; RTV, 200+ torque, etc. Haven't taken a test run yet; ugly weather. But, not a drop of fluid in the pan after several days now. A couple questions though. One, the nut took a 1 11/16 socket but has no built on washer. It looks just like the lower nut in the post(#20) above. Do you think a yard guy could have installed the wrong nut? Second, do you know how much alignment error is acceptable on a Federal Flex Drive Coupling. I called the factory but the guy refused to give an answer. He said, ".003 on direct shaft coupling. But with rubber mounts on the Federal you have much more flex." Still, no number! My tranny is about .015-.020 out at the 8:00 position looking from the rear. That's as close as I can get it without major work. There's no vibration so the .015 may be OK with the rubber bushings.
I must say that .015-.020" sounds like significant mis-alignment to me. Many references I have encountered over the years refer to an alignment error of no greater that .001" per inch of coupling diameter. Another common rule of thumb is no greater than .004". In the Yanmar installation manual for small diesels, it lists Coupling Face Run-out of 0-0.2 mm (0-.0078 in.). This is almost twice the generally accepted standard, but does include use of their very flexible engine mounts and a flexible coupling when the propeller shaft is short. R&D specify no more than .010" with their flexible couplings.

Henry H. Smith & Company is listed as a Federal Flexible Coupling distributor so you might give them a try at 800-338-8900 if you haven't already.

Good luck!
__________________
Larry
M/V Pelago
LarryM is offline   Reply With Quote
Old 02-03-2015, 03:13 PM   #26
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,890
0.020" out on the flange faces is quite a bit. How hard is it to tweak your engine to get closer to zero? May be a creative way to shim it/budge it/whatever etc to get closer. I don't know your flex drive, but do know that running with misalignment works the output shaft/flange joint and that may be why nut loosened.
Ski in NC is offline   Reply With Quote
Old 02-03-2015, 04:09 PM   #27
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 2,740
Quote:
Originally Posted by meridian View Post
I wonder if he used a used nut. When I took mine off, the washer had separated from the nut. Did he use any kind of washer? Brian at AD said it was a one-time use nut. I guess you can just keep an eye on it. No idea about the flex drive.
Yes it is supposed to be a one time nut. With the RTV it will likely stay in place.
Yes I agree .020 is too much out of alignment. A In addition to what Ski said, it has also been torqueing on the rear tranny bearing which is already under stress in the best of conditions.
__________________
Jay Leonard
Attitude Adjustment
40 Albin
Mystic,Ct. /New Port Richey,Fl
jleonard is offline   Reply With Quote
Old 02-03-2015, 10:31 PM   #28
Guru
 
C lectric's Avatar
 
City: Somewhere
Country: , Canada
Vessel Name: Island Pride
Vessel Model: Palmer sedan 32'
Join Date: Oct 2007
Posts: 1,874
I always used ~ 0.001" per inch diam of the coupling. So for a 5" diam coupling 0.005" was ok, not best , but ok. I usually get within 1 0r 2 thou. but total.
__________________

C lectric is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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





All times are GMT -5. The time now is 04:46 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012