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Old 29-05-2020, 07:58   #1
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Yanmar 3ym30 starting troubleshoot

I have 2 of those on my cat.
After winter/virus/travel delays, splashed it 2 days ago. Started port engine right away. STB one, cranks aplenty, but no turnover.

Here's what I tried so far:
- I have fresh fuel in the primary filter.
- Secondary filter bleed screw shows fuel leaking out, not water.
- Disconnected one injector, inserted a clean paper towel in between and cranked the engine. It was showing pink stain on the paper. Not much, but not much fuel normally gets through at startup speed, just a few squirts, right?
- Swapped the Solenoid from other engine, still no go?

What am I missing?

Daniel aka Pepe Lepew.
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Old 29-05-2020, 08:19   #2
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Re: Yanmar 3ym30 starting troubleshoot

Hmmm, usually a cracked injector should spray out a pretty good amount when cranked making a mess...? Any bubbles or steady stream?
How long was it layed up?
Maybe check the filters for a mass of goo inside? I've seen stuff that looked like Tofu in a boat that sat a couple years.

- Swapped the Solenoid from other engine, still no go?
?? I thought it was cranking over but not starting?
or do you mean the engine stop solenoid?
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Old 29-05-2020, 08:53   #3
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Re: Yanmar 3ym30 starting troubleshoot

I'm basing this off of my 3gm30, so it may be different on yours...I had the same problem recently.
Past the secondary filter, there is another bleed screw just prior to the injector. I bled the injectors over and over, then realized I overlooked this bleed screw. I cracked it, it bubbled once and the engine fired right up!
It is kinda buried in behind a coolant hose. I beleive 12mm, but also had a Phillips head. Just follow the line from secondary and you should see it.
Good luck
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Old 29-05-2020, 17:20   #4
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Re: Yanmar 3ym30 starting troubleshoot

Quote:
Originally Posted by Cheechako View Post
- Swapped the Solenoid from other engine, still no go?
?? I thought it was cranking over but not starting?
or do you mean the engine stop solenoid?

I meant the shutdown solenoid you push to stop the engine. I was told it might be stuck. So I used the one from other engine with no result.
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Old 29-05-2020, 17:28   #5
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Re: Yanmar 3ym30 starting troubleshoot

Success:

Just needed more flow.

I disconnected all three injector and a 15 second crank brought gushing fuel out. Reconnected them and it started right away. Some air bubble?


Thanks Chris.
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Old 29-05-2020, 18:33   #6
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Re: Yanmar 3ym30 starting troubleshoot

Good result & glad you posted it for others to learn from it.
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Old 30-05-2020, 08:43   #7
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Re: Yanmar 3ym30 starting troubleshoot

Man! I sure feel for your frustration.
We motored on the starboard 3YM30 only for 10 "looonng" days & nights from Roatan to the Panama Canal because the port engine wouldn't restart after a short shutdown underway.
At the Shelter Bay Marina it was a relief when the Yanmar serviceman determined, after 3 hours' work, that it was air in the line before injector pump....I hope I have that terminology correct.
I believe our problem was diagnosed in the fuel system after a fuel pump before the injector pump - a bubble of air in the line.
(Is it called the primary injector pump?)
Hope that helps....your post really hit a responsive nerve - so frustrating!! Good news: not expensive fix.
Best,
Richard
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Old 30-05-2020, 12:44   #8
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Re: Yanmar 3ym30 starting troubleshoot

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Originally Posted by S D Sailor View Post
Man! I sure feel for your frustration.
We motored on the starboard 3YM30 only for 10 "looonng" days & nights from Roatan to the Panama Canal because the port engine wouldn't restart after a short shutdown underway.
At the Shelter Bay Marina it was a relief when the Yanmar serviceman determined, after 3 hours' work, that it was air in the line before injector pump....I hope I have that terminology correct.
I believe our problem was diagnosed in the fuel system after a fuel pump before the injector pump - a bubble of air in the line.
(Is it called the primary injector pump?)
Hope that helps....your post really hit a responsive nerve - so frustrating!! Good news: not expensive fix.
Best,
Richard
I feel your pain, 10 days motoring on 1 engine in a cat!

However I just wanted to comment on the Yanmar serviceman taking 3 hours to find air in the fuel line.
Should have been second thing thing he looked for after making sure the fuel was on & there was some in the tank.
Seems like a long time to me to diagnose that problem. Just saying...

It's called the lift pump the one before the injector pump FYI
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Old 30-05-2020, 13:52   #9
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Re: Yanmar 3ym30 starting troubleshoot

Quote:
Originally Posted by PPLepew View Post
Success:

Just needed more flow.

I disconnected all three injector and a 15 second crank brought gushing fuel out. Reconnected them and it started right away. Some air bubble?


Thanks Chris.
Called loss of prime, it is often from that little bleed screw having a tiny leak, maybe from being slightly loose, but don’t overtighten it, it’s hollow and can be broken easily, or easier than an average bolt anyway.
It may never happen again.

Google diesel loss of prime, it’s actually not uncommon
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Old 30-05-2020, 14:02   #10
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Re: Yanmar 3ym30 starting troubleshoot

As a (retired) mechanic, I second the idea that 3 hours is too long for a diagnosis and correction of air in fuel lines.
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Old 01-06-2020, 18:09   #11
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Re: Yanmar 3ym30 starting troubleshoot

Quote:
Originally Posted by PPLepew View Post
Success:

Just needed more flow.

I disconnected all three injector and a 15 second crank brought gushing fuel out. Reconnected them and it started right away. Some air bubble?


Thanks Chris.
It sure feels good when it all comes together and you get it fixed! Good work, and congrats
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Old 01-06-2020, 18:16   #12
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Re: Yanmar 3ym30 starting troubleshoot

Quote:
Originally Posted by OloteleMtn View Post
As a (retired) mechanic, I second the idea that 3 hours is too long for a diagnosis and correction of air in fuel lines.
Ill bet 3 hours was the labour charge on the bill. May have included an hour or so of travel time, testing, clean-up, discussion with owner, etc.etc.
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Old 01-06-2020, 19:17   #13
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Re: Yanmar 3ym30 starting troubleshoot

Starting problems are almost always fuel related. Print, laminate, and post fuel bleed instructions near the engine. Ongoing issues with needing to bleed the fuel system is often the lift pump is mounted wrong. Some need to be mounted at an angle indicated on the instructions that came with it. If you didnt mount it dont asume someone else mounted it correctly.
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