Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 03-05-2019, 17:42   #1
Registered User

Join Date: Apr 2014
Boat: Moody 425
Posts: 276
Yanmar 4JH5E stalls when starting

Just started having this problem. I have a feeling it might be the fuel injection timing, but I'm not knowledgeable enough about diesels to know.

Here's what's going on. 2011 4JH5E with 2300 hrs. Regular timely inspection/replacement of Racor filter and engine fuel filter. The Racor is checked every day the engine runs. Filters not due for replacement for about another 150 hrs (Yanmar spec change every 250 hrs). The Racor hasn't had any dirt or water in it for about 3-4 filter changes. The 2000 hr service has not been done yet, and that includes checking the injection timing and injector spray pattern. I am planning on having that done when we get back to the Chesapeake, maybe 100-200 more engine hours - depends on if can sail outside or have to take the ICW north. After every time the engine runs I follow Yanmar shutdown procedures, rev in neutral, low to high 5 times then idle @ 1000 no load for 5 minutes.

When I attempt to start the engine it runs for about 5-10 seconds and then stalls, as if there's air in the fuel. Second attempt it doesn't start and I don't let it crank for more than 5 seconds. Those attempts are at the recommended 1000 rpm. Then I push the throttle so it's about 2000 rpm and it starts up right away. I pull it back to 1000 and it's fine. This started about 4-5 days ago, it hasn't been every time I start, but most times. The last time I bled the fuel was about 100 hrs ago.

So, any ideas what this might be? Could it be that the last time I bled it I didn't do a good job and now it's starting to show up? But why will it start at 2000 and not at 1000 rpm?

I'll be traveling the next few days so if anyone needs more info I might not reply right away.

Thanks. Larry
__________________

Sailing Drummer is offline   Reply With Quote
Old 03-05-2019, 17:53   #2
Registered User

Join Date: Feb 2013
Posts: 32
Re: Yanmar 4JH5E stalls when starting

Hi Larry, injection timing I believe does not drift in time. I believe it is an air leak. Go through your filters..good luck
__________________

alamoana is offline   Reply With Quote
Old 03-05-2019, 18:14   #3
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,605
Yanmar 4JH5E stalls when starting

Called loss of prime.
Seriously, try Googling ďDiesel loss of primeĒ youíll get all kinds of hits, read to see if it sounds familiar, and of course some troubleshooting steps.
It amounts to air getting into the system after shutdown, and is a phenomenon that has been around as long as Diesels have.

On my truck Diesel, a 6.6L Duramax, it was a loose bleed screw on the filter, it was an intermittent thing for a month or longer then one day it just would not start, that was when I got to digging into it.
a64pilot is offline   Reply With Quote
Old 03-05-2019, 18:23   #4
Registered User

Join Date: Mar 2014
Location: Caribbean
Boat: Lagoon 450
Posts: 880
Re: Yanmar 4JH5E stalls when starting

This happened on our starboard engine. It took quite a while to find the culprit, it was a curly piece of aluminum material that was lodged in the elbow connector of the primary fuel filter. It did not completely close off the supply but caused all the same issues you mention. Turns out it was a swarf material from when they drilled the holes in the alloy tanks for the fittings. Same issues have been found in fresh water supply where plastic drilled tanks have had swarf collect in filters and housing ports.
Bean Counter is online now   Reply With Quote
Old 03-05-2019, 18:27   #5
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 8,196
Re: Yanmar 4JH5E stalls when starting

Try starting at the first start with the throttle at about 1500-2000 and see what happens.
DeepFrz is offline   Reply With Quote
Old 03-05-2019, 19:05   #6
Registered User

Join Date: Apr 2014
Boat: Moody 425
Posts: 276
Yanmar 4JH5E stalls when starting

I hope it's not something lodged in the hose. That might be tough to find without replacing all the hoses.

Loss of prime looks very similar to what I'm experiencing. I'll have to check all the fittings to make sure they are tight. And look in the Racor to make sure it's full.

I'll try starting tomorrow at a higher rpm but not sure what that would tell me about the "why" it's doing it.

Thanks for the tips!
Sailing Drummer is offline   Reply With Quote
Old 04-05-2019, 12:30   #7
Registered User

Join Date: May 2019
Posts: 1
Re: Yanmar 4JH5E stalls when starting

On my etap 32s after six years of light weekender use I had similar problem. They started by checking injector, timings, etc.
It was a fully cloggeg exhaust pipe. Replaced and it went back to perfect.
Ps 18kw diesel twin cilinder volvo
AAC1956 is offline   Reply With Quote
Old 04-05-2019, 13:25   #8
Registered User

Join Date: Apr 2014
Boat: Moody 425
Posts: 276
Re: Yanmar 4JH5E stalls when starting

Don't think my exhaust is clogged. Always has plenty of water coming out. But I will take another/closer look to see if it looks like it's changed.

Tried starting this morning with revs up. Same exact issue - started then stopped, then wouldn't start, then started with the revs up. Also this morning I gave the pump a little more time (but still same issue). Tomorrow I'll get to Vero and be on a mooring in a more protected area. We've been bouncing all over the place with this weather. I'll bleed about a quart or more and make sure there are no bubbles. And I'll check the Racor, drain it and refill it (before I bleed the fuel). I think it looks like the answer is loss of prime. And I have to find out where the leak is.

Larry
Sailing Drummer is offline   Reply With Quote
Old 04-05-2019, 15:16   #9
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,605
Re: Yanmar 4JH5E stalls when starting

Usually, or at least every time Iíve experienced it, a blockage in the fuel line results in a drop in RPM or even engine shutting down at high power, reason is of course it canít flow the fuel required to run at high power.
a64pilot is offline   Reply With Quote
Old 04-05-2019, 20:49   #10
Registered User
 
01kiwijohn's Avatar

Join Date: Mar 2014
Location: Tacoma, Washington, USA
Boat: Casacde 36
Posts: 489
Images: 1
Re: Yanmar 4JH5E stalls when starting

Drummer, somewhere, you have a small air leak. It could also be air trapped in the system, but I doubt it as it runs ok once you do get it running.
01kiwijohn is offline   Reply With Quote
Old 05-05-2019, 01:33   #11
Registered User

Join Date: May 2019
Posts: 1
Re: Yanmar 4JH5E stalls when starting

Hi I had the same problem or symptoms. Turned out to be the electric fuel lift pump had stopped operating.
Presscars is offline   Reply With Quote
Old 05-05-2019, 03:19   #12
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 24,605
Re: Yanmar 4JH5E stalls when starting

Quote:
Originally Posted by Presscars View Post
Hi I had the same problem or symptoms. Turned out to be the electric fuel lift pump had stopped operating.


Happened to me too on a K3500 6.2L truck.
I didnít even know the thing had an electric lift pump, it was down in the frame rail.
a64pilot is offline   Reply With Quote
Old 05-05-2019, 07:51   #13
Registered User

Join Date: Feb 2006
Location: In NE for summer then south when it gets cold
Boat: Lagoon 470 cat
Posts: 333
Re: Yanmar 4JH5E stalls when starting

Try leaving the key on for 30-60 seconds before turning over the engine. Will give the electric fuel pump time to push any air through the system.


Bill
Moontide is offline   Reply With Quote
Old 05-05-2019, 13:46   #14
Registered User

Join Date: May 2019
Posts: 1
Re: Yanmar 4JH5E stalls when starting

It will probably be the fuel presure pump, a diesel has a fuel presure pomp, normally when air is in the line the fuel presure pump is broken.


You sometimes only notice this issue after a long time not turning on your motor, or when you are at heavy sea so big waves so air is flowing in your diesel fuel lines and stops the "normal vacuum" you engine will produce when started.


So check this fuel presure pump
whosnext is offline   Reply With Quote
Old 05-05-2019, 14:55   #15
Registered User

Join Date: Mar 2014
Location: Caribbean
Boat: Lagoon 450
Posts: 880
Re: Yanmar 4JH5E stalls when starting

Buy 50ft of diesel fuel hose and a couple of joiners and T's (it will come in handy later if you ever need to run both engines off one tank - includes return) Run the hose from one tank to the other motor - this will identify where the issue lies - in the lines or at the motor.
__________________

Bean Counter is online now   Reply With Quote
Reply

Tags
yanmar

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Yanmar 4JH5E Injection Pump Failure gmthompson99 Engines and Propulsion Systems 11 05-02-2018 11:17
Yanmar 4JH5E to NMEA200 roetter Marine Electronics 2 16-10-2013 20:36
Yanmar 4jh5e service / shop manual download Pwrybas Engines and Propulsion Systems 1 22-06-2013 02:49
Yanmar 4JH5E Gasket source? gbanker Engines and Propulsion Systems 3 19-12-2011 03:08
Perkins 4.108 Replacement with Beta 43 or Yanmar 4JH5E AbacoBahamaMan Engines and Propulsion Systems 2 06-08-2010 16:14



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:51.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.