Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-06-2011, 07:29   #1
Registered User
 
nv5l's Avatar

Join Date: Dec 2010
Location: Liveaboard
Boat: Allied Luders 33, Hull 98, 1971
Posts: 393
Images: 1
Yanmar Transmission Problem

I was motoring last winter at about 3,000 rpms for a few hours and all the sudden it started making all sorts of noise and I lost all propulsion. I backed off the throttle and took her out of gear and the noise stopped. After checking various combinations, I found that the only time I got the noise was in gear, forward or reverse, with power, not at idle. However, at idle, the shaft would turn normally.

A friend suggested it was probably the dampening disk, but after pulling the transmission and the disk, I can't find any problem. I've got the transmission sitting in from of me taken almost completely apart and can't see anything wrong with it. Nothing's broken or worn.

I did find lots of red stuff on the output spline and retaining nut, but figured that might have been locktight. I also found red covering the disk, but since everything was rusty, I didn't find that surprising either.

Any suggestions of what to else to check? Could the disk be bad even if it doesn't look broken?


btw, it's a Yanmar 3HMF w/ KBW10E.

thanks...
don
__________________

__________________
don
NV5L
S/V Aurora
nv5l is offline   Reply With Quote
Old 03-06-2011, 02:00   #2
Registered User

Join Date: Mar 2009
Location: Australia, Central Coast.
Boat: Boden 36 Triple chine long keel steel, named Nekeyah
Posts: 777
Re: Yanmar transmission problem

How is your prop shaft bearing? Also, is your prop on tight?
Regards,
Richard.
__________________

__________________
boden36 is offline   Reply With Quote
Old 03-06-2011, 03:48   #3
Registered User
 
Laidback's Avatar

Join Date: Jun 2007
Posts: 853
Re: Yanmar Transmission Problem

Quote:
Originally Posted by nv5l View Post
I was motoring last winter at about 3,000 rpms for a few hours and all the sudden it started making all sorts of noise and I lost all propulsion. after pulling the transmission and the disk, I also found red covering the disk, but since everything was rusty, I didn't find that surprising either.


btw, it's a Yanmar 3HMF w/ KBW10E.

thanks...
don
Why was the Disc rusty ? What made it Rust ?
__________________
Laidback is offline   Reply With Quote
Old 15-06-2011, 08:45   #4
Registered User
 
nv5l's Avatar

Join Date: Dec 2010
Location: Liveaboard
Boat: Allied Luders 33, Hull 98, 1971
Posts: 393
Images: 1
Sorry for the late reply, had some connectivity issues.

I've got it out, and everything looks good, except the disk drive springs are a bit loose and there's a groove worn in the thrust washers. Looks like it wore down enough to make the clutch slip under load, and the loose disk drive accounted for the noise -- it was slipping and grabbing several times a second and the disk drive would bank each time. Before this happened, I'd hear a clunk each time I put her into gear.

Parts should be hear by the end of the week, so I hope to finish her up and get back in the water by the end of the month. Thanks for all the replies.
__________________
don
NV5L
S/V Aurora
nv5l is offline   Reply With Quote
Old 15-06-2011, 10:20   #5
Senior Cruiser
 
delmarrey's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Now in Blaine, WA
Boat: Modified Choate 40
Posts: 10,702
Images: 122
Re: Yanmar Transmission Problem

Had a friend who had to replace his thrust washers a couple times. He ended up going to a full service transmission vs his pleasure trans.
__________________
Faithful are the Wounds of a Friend, but the Kisses of the Enemy are Deceitful! ........
A nation of sheep breeds a government of wolves!

Unprepared boaters, end up as floatsum!.......
delmarrey is offline   Reply With Quote
Reply

Tags
transmission, 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
Hurth ZF 10 M Transmission Problem - Any Advice on Removal ? sgtPluck Propellers & Drive Systems 15 06-02-2017 20:06
Volvo Penta Transmission Problem kismet Engines and Propulsion Systems 0 04-08-2010 12:10
Hurth Transmission Problem Chief Engineer Propellers & Drive Systems 18 30-05-2010 14:34
'83 Velvet Drive Transmission Problem indypopeye Engines and Propulsion Systems 2 21-06-2009 19:57
Yanmar 2GMF transmission freightdog Propellers & Drive Systems 10 06-08-2008 18:07



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 07:08.


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.