Yanmar YSM12 Keeps Dying - 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 06-11-2010
Junior Member
 
Join Date: Aug 2001
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
mjberns is on a distinguished road
Question Yanmar YSM12 Keeps Dying

I have a YSM12R that has been giving me problems since the start of the season. As we were leaving the marina where it was stored for the winter and where the mechanics commissioned it for the summer, the engine died. I bled the lines and the engine restarted and we sailed to where I keep the boat for the summer. As we headed in, the engine wouldn't start, bleeding or no.

The marina sent someone over to check it out and the theory was they'd over-filled the oil, which got into the cylinder as we heeled. They siphoned some out and the engine ran fine.

A few days later I ran the engine for about 30 minutes at the dock, no prob. As we headed out for a Wednesday night race, it died and wouldn't stay running. It'd fire but not stay going.

Since then I've gotten various suggestions, and have re-seated the secondary filter and replaced the fuel lines into the Racor and from Racor to the secondary. Engine ran like a charm in neutral and under load for over an hour, stopped and restarted no problems. Today, same thing - stopped and started, under load and in neutral, all fine. Until I ran it in neutral at fairly high RPMs, then throttled back fairly quickly and the engine died. Wouldn't restart until I bled it again. Then it seemed fine until I did the same thing - throttle up, throttle back and it died and wouldn't stay running.

I bled it again and if I throttled back slowly it seemed not to cause the problem. Of course, it's like the old joke where the doctor says, "Don't do that again." But I'm concerned about whether there's something else I should be looking at or if this is more or less normal behavior.

Thanks
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 06-11-2010
Gene T's Avatar
Senior Member
 
Join Date: May 2006
Location: Left Coast USA
Posts: 666
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
Gene T is on a distinguished road
A vacuum gauge would tell you a lot. One problem that is difficult to diagnose is a chunk of debris plugging the pickup tube in the fuel tank. Things work fine and then the engine quits, when the vacuum drops the debris falls out of the way and the engine runs again. It is often overlooked by most mechanics. High vacuum generally causes air getting in the fuel from an o-ring on the filter or somewhere else. A vacuum gauge would help diagnose.

Gene
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Currently in Long Beach, CA
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 06-12-2010
obleo
 
Join Date: Sep 2006
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
obleo is on a distinguished road
Sounds like it is a fuel problem up stream of the engine. I had problems like that and finally pulled the fuel tank and had it cleaned & replaced all hoses and fittings. Good luck.
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 baffling black smoke Tspringer Diesel 27 08-03-2012 10:44 AM
Replacing our Volvo Penta Engine - Yanmar model? windtraveler Diesel 10 11-25-2010 03:59 PM
Need help YANMAR engine mount Giulietta Gear & Maintenance 20 04-15-2010 02:15 PM
FYI: To all owners of Yanmar Diesels -YSM8 -found fix to stall problem jrowan Diesel 2 04-14-2010 09:37 AM
Need advice on engines - Westerbeke 30B or Yanmar 3YM30? Terry60 Diesel 15 01-31-2010 02:51 AM


All times are GMT -4. The time now is 12:46 PM.

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.