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 26-03-2008, 14:01   #1
Registered User

Join Date: Jan 2006
Location: North Carolina
Boat: 44 footer
Posts: 953
Constant submersion lower unit?

Hi guys,

I'm curious about the seals in lower units like saildrives, and thrusters. On one side theres the ocean, on the other is gear oil.

I'm thinking about building a 90 degree gear box for constant immersion in salt water but haven't torn down any pre-existing units to see what they use for a shaft seal. Are they just lip seals, or do they have some fancy stuff going on inside?

Thanks guys.

Zach is offline   Reply With Quote
Old 26-03-2008, 15:20   #2
Senior Cruiser
 
Alan Wheeler's Avatar

Cruisers Forum Supporter

Join Date: Dec 2003
Location: Marlborough Sounds. New Zealand
Boat: Hartley Tahitian 45ft. Leisure Lady
Posts: 8,038
Images: 102
They are just a lip seal.
You are going to build a 90deg box?? Why???
__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 26-03-2008, 15:41   #3
Registered User

Join Date: Jan 2006
Location: North Carolina
Boat: 44 footer
Posts: 953
Thanks Alan!

I'm building a hydraulic bow and stern thruster for a 1942 83 foot coast guard cutter turned motor yacht.
Zach is offline   Reply With Quote
Old 28-03-2008, 20:12   #4
Eternal Member
 
Chief Engineer's Avatar

Join Date: Aug 2006
Location: North of Baltimore
Boat: Ericson 27 & 18' Herrmann Catboat
Posts: 3,798
You would be better off buying a unit.

If the vessel is twin screw, what is the advantage?

Wood Hull?

What was the USCG # ?
Chief Engineer is offline   Reply With Quote
Old 30-03-2008, 10:37   #5
Registered User

Join Date: Jan 2006
Location: North Carolina
Boat: 44 footer
Posts: 953
Chief,

CG 83334 When she went to Normandy she was USCG 6. Looks a little bit different now... nevertheless I'm lobbying to paint the skull and cross bones once more.


She has a wood hull, built by Wheeler. She's powered by two cummins diesels, 855ci putting out 194 hp each. Originally she weighed 83 tons, but after the cabin was added, and the hull glassed she's closer to a hundred.

The reason for the bow and stern thruster, is that with 15 knots of wind the bow blows over. Around a thousand square feet of windage, with the port engine in reverse and the starboard in forward she won't hold hold the bow steady. The hope is that two 700lb thrusters will make docking in less than perfect conditions less stressful.
Zach is offline   Reply With Quote
Reply

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
Lower Chesapeake Vasco Marinas 12 21-02-2011 17:19
(Re-)moving Lower Forward Shrouds eyck Deck hardware: Rigging, Sails & Hoisting 7 13-09-2009 22:05
Windows Vista,Constant Crash!!!!!!!!!! Ram Marine Electronics 2 22-02-2007 10:06
24v fuel pump constant running Fuss Engines and Propulsion Systems 10 20-09-2006 08:59
Lower Chesapeake Marina Vasco General Sailing Forum 1 04-05-2004 05:21

Advertise Here


All times are GMT -7. The time now is 00:44.


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.