Cruisers Forum
 


Join CruisersForum Today

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 13-02-2020, 15:51   #1
Registered User
 
MondayNever's Avatar

Join Date: Aug 2015
Boat: Contest 46
Posts: 86
Threaded rudder post collar - what is this?

Hey all, just bought a new old boat (1995 Contest 46) and I’m digging into the many projects at hand. On the sea trial we noted that there was some sea water leakage into the boat at the rudder post when we were squatting the stern down while running at WOT (with our way overkill 135hp). On further inspection, there is a threaded plastic collar that encompasses the shaft at the top of the rudder tube. This unit can be tightened down, which I have done. I have not taken the boat back out to test whether tightening stopped the leak yet.

My question is: what does this collar do? Is this essentially a packing gland? Is it possible that there is a flax ring filled stuffing box below the collar? If so, is there a limit to how to tight the collar should be (given that it’s a slow moving shaft, unlike a prop shaft)?

Here are pictures of a spare collar that I found laying around. Hopefully someone more knowledgeable than me will be able to immediately identify its function, but if not I can pull apart the panels behind the aft berth to get pics of the entire rudder assembly.

Thank you cruisersforum hive mind!
Attached Thumbnails
Click image for larger version

Name:	562D65EF-DD59-48DF-912B-EA0AED56A3F9.jpeg
Views:	19
Size:	20.5 KB
ID:	208655   Click image for larger version

Name:	5D68CA5C-41BD-4512-B1E2-B15F836D27FF.jpeg
Views:	21
Size:	19.4 KB
ID:	208656  

Click image for larger version

Name:	E51CEFCC-54C4-41AB-8869-86719DAD0781.jpeg
Views:	18
Size:	19.3 KB
ID:	208657  
MondayNever is offline   Reply With Quote
Old 14-02-2020, 02:58   #2
Senior Cruiser

Cruisers Forum Supporter

Join Date: May 2013
Location: Oregon to Alaska
Boat: Wheeler Shipyard 83' ex USCG
Posts: 2,633
Re: Threaded rudder post collar - what is this?

The rudder shaft will have a seal. sometimes just like the prop shaft. Because the top of the rudder shaft housing is usually above the waterline, the packing will sometimes dry out and allow leaks.
Lepke is offline   Reply With Quote
Old Today, 20:04   #3
Registered User

Join Date: Jan 2009
Location: San Diego, California - Read about our circumnavigation at www.rutea.com
Boat: Contest 48
Posts: 976
Images: 1
Re: Threaded rudder post collar - what is this?

My 1984 Contest 48 has a similar setup. On mine, there was flax packing that sealed tight for many years. However, we did develop a significant leak during our 49,000-mile circumnavigation. While we were hauled out, I removed the plastic ‘nut’ and had a new one fabricated that had two grooves for o-rings machined on the inside bore. I dug out the old packing and packed as much silicon grease in the cavity as I could fit. Then I installed three new rings of Teflon packing, with each ring’s mating surface offset from the next by 180°. We’ve put about 10,000 miles on it since that repair and it hasn’t leaked a drop.

Congratulations on your new-to-you boat. We love our Contest and we hope you enjoy yours.

Fair winds and calm seas.
nhschneider is offline   Reply With Quote
Reply

Tags
rudder

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
Belize 43: Lower Rudder Shaft Bearing and Collar peteatbeach Fountaine Pajot 2 13-08-2014 19:33
Installing PSS, threaded stern tube Kestrahl Propellers & Drive Systems 2 16-05-2013 04:58
Rudder shft retention collar Svmerlin Construction, Maintenance & Refit 1 13-05-2013 13:44
BSPP Threaded Bronze Pipe Caps ? SV Demeter Plumbing Systems and Fixtures 12 29-12-2010 11:32
Threaded SS Backing Plates Epoxied in Place ? SvenG Construction, Maintenance & Refit 17 21-08-2010 04:56

Advertise Here


All times are GMT -7. The time now is 23:46.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.