Yanmar 2gm transmission noise - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 
  #1  
Old 08-24-2012
Junior Member
 
Join Date: Apr 2007
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rchad is on a distinguished road
Yanmar 2gm transmission noise

Sometimes when I reduce the throttle on my Yanmar 2gm to idling speed, while still in gear, and try to increase throttle again, I hear a "clickity clacking" sound ....almost as though gears were not fully meshing. Sometimes the sound goes away as I accelerate. Other times I shift into neutral and repeat the process, which seems to fix the problem. Seems to only happen in forward gear, and more noticeably, when the engine is warm.

I am Puzzled.....any thoughts?
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 08-27-2012
Banned
 
Join Date: Jul 2007
Location: Truckee, CA
Posts: 8,591
Thanks: 2
Thanked 115 Times in 113 Posts
Rep Power: 0
dabnis is on a distinguished road
Re: Yanmar 2gm transmission noise

Maybe?

1. Loose or damaged motor mount(s)

2. Lose flywheel or springs in drive plate

3. Lose or missing gearbox to motor bolts

4. Loose propeller shaft to transmission coupling

5. Worn or out of adjustment clutch mechanization, try an oil change

6. Shift cable out of adjustment preventing full engagement in forward, try it with the cable disconnected shifting to forward by hand

Let us know what you find

Paul T
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 08-27-2012
Junior Member
 
Join Date: Apr 2007
Posts: 24
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rchad is on a distinguished road
Re: Yanmar 2gm transmission noise

Thanks,

Shaft to coupling is fine. I, too, suspect clutch linkage issue. I'll try the shifting by hand method to see if I get better gear engagement.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 09-13-2012
Senior Member
 
Join Date: Feb 2010
Posts: 181
Thanks: 1
Thanked 9 Times in 8 Posts
Rep Power: 5
redline is on a distinguished road
Re: Yanmar 2gm transmission noise

I had something similar with the 2GM20F on my previous boat - a "clunk clunk clunk" when attempting to shift into forward, usually some additional revs and re-shifting would get it to engage. The clutch cone was worn; first time I had it serviced the marina "lapped" the cone which fixed it - for one year. When the problem came back they did the same thing again which did NOT work, at its worst I cleared Canadian customs while motoring backwards because forward would not engage.

Finally I pulled the transmission myself and had it rebuilt elsewhere.

FYI the Yanmar cone-clutch transmission has to be locked in Reverse while sailing; if left in forward the boat's motion will tend to release the cone's engagement and wear it away.

Not necessarily so for the larger plate-type transmission (where I've read conflicting info but *think* I'm doing the right thing by shifting to forward while sailing).
__________________
Norman
s/y "Redline"
1998 Jeanneau SO45.2
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 01-26-2013
Junior Member
 
Join Date: Jul 2009
Location: Vancouver Island
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
salishsea is on a distinguished road
Re: Yanmar 2gm transmission noise

Cruising this site on another issue, this thread about the 2GM tranny caught my eye as in May/2012 I changed oil in the engine and tranny to a new multigrade "synthetic" oil (which Yanmar sells under their brandname). Huge mistake. The tranny began to vibrate and skip at 1500 rpm. Bringing in the mechanic he scoped the engine rpm and the tranny rpm and saw the drop dramatically. Draining the tranny oil back to 30 grade standard oil ( 3times) has virtually reduced the slippage. His words were "this is a 30 year old engine, 30 year old technology - keep it simple and stay away from synthetics (which weren't used then and are not mentioned in the manual). This tranny needs friction. Hopefully no damage done. Now I will continue searching the threads for something I saw about the slow response of the starter when you hit the start button due to the wiring at the solenoid or starter being the wrong size.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 01-28-2013
casey1999's Avatar
Senior Member
 
Join Date: Oct 2010
Location: HI
Posts: 3,030
Thanks: 11
Thanked 32 Times in 31 Posts
Rep Power: 5
casey1999 is on a distinguished road
Re: Yanmar 2gm transmission noise

Quote:
Originally Posted by salishsea View Post
Now I will continue searching the threads for something I saw about the slow response of the starter when you hit the start button due to the wiring at the solenoid or starter being the wrong size.
Your slow start could be due to bad connections between the push to start button and the start solenoid located on the starter. Some have added a relay at the start solenoid that would be energized by the push button. This would put less current through the push button (therefore less voltage drop and more voltage on the start solenoid) on starting and might "fix" you problem. I think the additional relay just adds another failure point. You could check the connections along the existing wiring or rewire with larger gauge wiring.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
yanmar 2gm noise garageguy55 Diesel 4 06-21-2012 02:59 PM
Yanmar transmission oil sailak Diesel 7 08-17-2011 02:19 PM
Yanmar 2GMF Transmission Oil? dacap06 Gear & Maintenance 4 04-20-2010 12:03 AM
Transmission Noise billbalme Pacific Seacraft 17 09-30-2009 10:55 AM
yanmar transmission rbtpfe9 Gear & Maintenance 0 09-06-2005 11:46 AM


All times are GMT -4. The time now is 06:28 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.