Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 31-05-2015, 17:59   #1
Registered User
 
Privilege's Avatar

Join Date: Oct 2009
Location: Bermuda
Boat: Privilege 435
Posts: 362
Images: 12
Yanmar sail drive troubleshooting advice needed.

I've got a SD31 sail drive which won't go into gear. This started half an hour after I'd given it an oil change, putting in the correct amount of manufacturer recommended 80/90w and not overfilling it.
I've taken the top gearbox assembly apart and everything seems fine. I cleaned the dog clutch anyway and reassembled it. Before putting the top cover back on, I held down the top of the gear shaft and the clutch was popping up and down nicely in response to the gear lever but when everything was reassembled the problem remains
When I had the clutch disassembled, I put it back onto the sleeve at the top of the leg drive and turned it by hand. It did turn the prop albeit with a funny clicking noise. When I reassembled everything the gear shift lever sounded like it was still working fine with the forward and reverse gears both clicking properly as the clutch pops up or down. When the lever is engaged the drive makes a rattling noise as if teeth are not engaging and the prop won't turn.
It sounds as if something has gone wrong in the lower leg but I thought I'd seek advice from the forum before I have to slip the boat.
Any thoughts?
Thanks.
__________________
Privilege is offline   Reply With Quote
Old 31-05-2015, 18:05   #2
Sponsoring Vendor
 
Tellie's Avatar

Community Sponsor

Join Date: Oct 2007
Location: Hollywood, Fl.
Boat: FP Athena 38' Poerava
Posts: 3,046
Re: Yanmar sail drive troubleshooting advice needed.

How old are the props? I worked on a boat a few years ago that had a prop issue on ther sail drive with the binding material that makes the mechanical connection between the spline and the prop itself. We thought we had a bad leg because it felt that it wouldn't go into gear when actually the spline was spinning within the prop. Funny thing was that it did not happen all the time. A long shot but might be worth taking a look.

Halden Marine Services | Marine Watermakers, Solar Panels, Wind Generators
Tellie is offline   Reply With Quote
Old 03-06-2015, 08:21   #3
Registered User
 
Privilege's Avatar

Join Date: Oct 2009
Location: Bermuda
Boat: Privilege 435
Posts: 362
Images: 12
Re: Yanmar sail drive troubleshooting advice needed.

Tellie, thanks for your input. What a good idea, I hadn't considered that. It could have saved me $1k but instead all it did was get me wet and cold!

However, while down at my props, I think that I may have found the problem. The lower gear housing bolts have loosened up where the zincs have corroded and the housing has come out of the leg by about an 1/8". It's not enough to allow water in past the oil seals but may be enough to disengage one or more of the gears. It's on the list of things to fix. Thanks again.
__________________
Privilege is offline   Reply With Quote
Reply

Tags
sail, yanmar

Thread Tools
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
Yanmar SD20 Sail Drive Caution Strygaldwir Engines and Propulsion Systems 58 26-07-2017 13:21
Experience needed on replacing seals on SD10 sail drive Ostinato Propellers & Drive Systems 0 11-05-2015 12:49
Yanmar SD31 Sail drive captnknopf Engines and Propulsion Systems 3 10-11-2014 13:40
Troubleshooting Yanmar 3GMD Instruments. Duke 48 Engines and Propulsion Systems 2 12-03-2012 09:43
Sail Drive Oil Change - Yanmar w/ SD20 Leg Jacana Monohull Sailboats 9 03-06-2009 19:13



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:14.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.