SailNet Community - Reply to Topic

   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 > unusual starting Yanmar
 Not a Member? 


Thread: unusual starting Yanmar Reply to Thread
Title:
  

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

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
05-14-2009 03:53 PM
JohnRPollard
Quote:
Originally Posted by bubb2 View Post
I have the same Yanmar in my Beneteau. I put about 50 hrs on the engine per season. The engine has about 300 hrs total on her as I write this post. During the third season the engine started to vibrate at idle so bad it would shake the whole rig. Sounded something awful. After she gained some rpm’s she would smooth out. This puzzled me for some time. What I found was that my throttle cable had stretched and had dropped the idle speed down. Causing the engine to drop a cylinder (firing on only one.) After readjusting the cable (on the left side on the engine as you are facing it) to bring the idle speed back up, no more shaking. Let me know if it works for you
I will second that.

Sometimes it's not even necessary to adjust the cable itself. There is a detente where the cable attaches to the throttle assembly that can be adjusted easily by turning one (maybe two?) nuts. Adjust it a bit and the cable will not be able to pull the throttle assembly back as far, and the idle rpm will stay higher. It will only take about 30 seconds to make the adjustment.

P.S. Welcome to SailNet!
05-14-2009 12:41 PM
timebandit Rule #1
The last thing you mucked with is the first thing to mess up.
05-14-2009 09:47 AM
SteveInMD Check for air leaks before the lift pump.
05-14-2009 03:54 AM
bubb2 I have the same Yanmar in my Beneteau. I put about 50 hrs on the engine per season. The engine has about 300 hrs total on her as I write this post. During the third season the engine started to vibrate at idle so bad it would shake the whole rig. Sounded something awful. After she gained some rpm’s she would smooth out. This puzzled me for some time. What I found was that my throttle cable had stretched and had dropped the idle speed down. Causing the engine to drop a cylinder (firing on only one.) After readjusting the cable (on the left side on the engine as you are facing it) to bring the idle speed back up, no more shaking. Let me know if it works for you
05-14-2009 12:52 AM
badsanta Maybe your throttle cable has slipped causing it to idle to slow and having to use more throttle than normal to start
05-13-2009 09:16 PM
JimsCAL Definitely sounds like a fuel issue. Could be a bad injector.
05-13-2009 09:11 PM
captbillc you can loosen one high pressure line at a time when the engine is running at the speed where it is not shaking. this is like shorting a spark plug on a gas engine to see which cylinder is not firing. if that makes no difference in operation , that is the one not firing. be careful because the high pressure fuel can give you blood poisoning if it penetrates your skin. i suspect one of the cylinders is not firing.
05-13-2009 08:25 PM
gevanoff
unusual starting Yanmar

any help would be appreciated.

my 2gm is an original from 1982.
it has been running fine and I am the original owner
the filters have been changed regularly

this season when launched it started normally and ran for ~5minutes before violent shaking and stopping!

now it will not start at 1/4 throttle( were it always did) I can start it at 1/2 - 3/4 throttle it starts and runs smoothly when I let it warm up and try to throttle back to neutral it starts to shake violently and stop.

I have bled the system to no avail. It was suggested to try starting on one cylinder at a time to see if they are equal and they are.

any suggestions at what I can look at or what may be the problem


thanks

 
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


All times are GMT -4. The time now is 11:41 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.