Yanmar and No Start - 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 07-21-2012
BarryL's Avatar
Senior Member
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,671
Thanks: 3
Thanked 32 Times in 29 Posts
Rep Power: 12
BarryL is on a distinguished road
Yanmar and No Start

Hey,

The boat I race on has an older yanmar engine. I don't know the model, but it makes around 14 HP. Anyway, I've been racing on this boat for a few years and the engine is easiest starting diesel I've ever seen. The owner turns the key, presses the start button and the engine starts in 1 second.

This year the owner reported that the engine would not start. He would press the start button and nothing happened. He did some troubleshooting and determined the starter was bad. I assisted him and we were not able to get the engine to turn over. So I removed the starter (which wasn't too hard to do) and he bought a rebuild. We put it in this past Monday and the engine started right up. He raced that night. We had race practice Tuesday, and raced Thursday. The engine started and ran great. Thursday night, after the racing was over, the engine would not turn over. We sailed back to the mooring.

Friday I helped trouble shoot. The batteries were a little low (12.4V) so I tried my jump pack. No go. Then I removed one of my new group 27 batteries from my boat and connected that. No go. We gave up and I went home.

Today we tried again: perhaps the rebuilt starter was no good. I removed it and we powered it up sitting on the cabin sole. It spun nicely when I applied power to the main terminal and solenoid. I put the starter back in and nothing. I checked power at the solenoid and when the start switch was activated I saw 12.3V at the solenoid. I measured power at the starter on the heavy wire from the battery and also saw 12.3V. The power was a little low, but I thought it would be enough to turn the engine over.

At this point I have exhausted my knowledge so we went home. The owner got a mechanic to look at the boat and he had it running in about 15 minutes.

Anyone care to guess at the cause?

I'll put the solution to the problem in the next post.

Barry
__________________
Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 07-21-2012
BarryL's Avatar
Senior Member
 
Join Date: Aug 2003
Location: Long Island, NY
Posts: 1,671
Thanks: 3
Thanked 32 Times in 29 Posts
Rep Power: 12
BarryL is on a distinguished road
Solution

Hey,

The mechanic reported that the main battery ground, the one connected to the engine, was corroded and bad. He removed the connections, cleaned, and re-installed. Presto chango, the engine starts right up.

I was fooled because I was able to see voltage. I have no way of measuring current, so this one got me.

In the future I will be a lot more careful about checking ground connections.

Barry
__________________
Barry Lenoble
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 07-21-2012
lajimo's Avatar
Senior Member
 
Join Date: Sep 2011
Posts: 187
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 4
lajimo is on a distinguished road
Yanmar and No Start

Great follow up, thanks for the info.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 07-22-2012
CalebD's Avatar
Tartan 27' owner
 
Join Date: Jan 2008
Location: NYC
Posts: 4,617
Thanks: 4
Thanked 93 Times in 85 Posts
Rep Power: 7
CalebD will become famous soon enough
Re: Yanmar and No Start

Similar diagnosis but different problem.

I was checking out a friends boat whose electrical system was not working properly (no running lights, cabin lights and several other switches on the main board did not function).
It was not the first thing I checked but I opened up the battery locker to have a look. The fittings on the battery terminals did not look great but seemed ok. I noticed that one wire was not connected to the 2nd battery's neg (-) terminal. Apparently that wire supplied the ground to one of the negative buses so nothing attached to that bus worked until we shined up the connector and attached it to the battery.
__________________
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen

Everybody has one:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 07-22-2012
JimsCAL's Avatar
Senior Member
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,497
Thanks: 2
Thanked 46 Times in 42 Posts
Rep Power: 8
JimsCAL is on a distinguished road
Re: Yanmar and No Start

Thanks for the update. Good reminder that one of the first things to do when you have such problems is to clean all the battery connections.

One bit of information to other Yanmar owners is that they are noted for having a starting problem if the cable run from the engine to the panel is too long. Voltage drop to the solenoid can cause an intermittent no-start issue. The solution is to add a starting relay in the circuit. Any Yanmar dealer can help with details.
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 07-22-2012
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 and No Start

As you now know, you might see a "surface' reading on your meter but with so much resistance in a bad connection and trying to pull a heavy load through it, no go. A similar condition can exist when grounding a spark plug outside an engine to check for spark. If the high tension voltage is marginal you might see spark but when you put it back in the engine the compression adds more resistance and the plug won't fire.

Paul T
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 1GM10 won't start Sometimesbrilliant Gear & Maintenance 16 08-01-2014 07:00 PM
no start Yanmar rchad Diesel 53 10-27-2012 06:08 PM
Yanmar 3YM 30 start battery Brahmany C320 3 03-06-2011 07:00 AM
yanmar 2qm 20 will not start lordpoltimore Diesel 13 03-08-2010 02:26 PM
Can't start My Yanmar bun243 Gear & Maintenance 8 06-04-2006 02:22 AM


All times are GMT -4. The time now is 03:23 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.