|
29-05-2020, 07:58
|
#1
|
Registered User
Join Date: Jan 2012
Location: Wherever the boat lies, USA coasts, Keys, Bahamas & Islands
Boat: Island Spirit 40' Cat
Posts: 90
|
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.
__________________
Daniel - aka Pepe Lepew
|
|
|
29-05-2020, 08:19
|
#2
|
Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,477
|
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?
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard
|
|
|
29-05-2020, 08:53
|
#3
|
Registered User
Join Date: May 2015
Location: edmonton alberta
Boat: 1992 lagoon 42 tpi
Posts: 1,729
|
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
|
|
|
29-05-2020, 17:20
|
#4
|
Registered User
Join Date: Jan 2012
Location: Wherever the boat lies, USA coasts, Keys, Bahamas & Islands
Boat: Island Spirit 40' Cat
Posts: 90
|
Re: Yanmar 3ym30 starting troubleshoot
Quote:
Originally Posted by Cheechako
- 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.
__________________
Daniel - aka Pepe Lepew
|
|
|
29-05-2020, 17:28
|
#5
|
Registered User
Join Date: Jan 2012
Location: Wherever the boat lies, USA coasts, Keys, Bahamas & Islands
Boat: Island Spirit 40' Cat
Posts: 90
|
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.
__________________
Daniel - aka Pepe Lepew
|
|
|
29-05-2020, 18:33
|
#6
|
Marine Service Provider
Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,803
|
Re: Yanmar 3ym30 starting troubleshoot
Good result & glad you posted it for others to learn from it.
|
|
|
30-05-2020, 08:43
|
#7
|
Registered User
Join Date: Apr 2015
Location: San Diego
Boat: 2011 Leopard 384
Posts: 24
|
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
|
|
|
30-05-2020, 12:44
|
#8
|
Marine Service Provider
Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,803
|
Re: Yanmar 3ym30 starting troubleshoot
Quote:
Originally Posted by S D Sailor
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
|
|
|
30-05-2020, 13:52
|
#9
|
Moderator Emeritus
Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,351
|
Re: Yanmar 3ym30 starting troubleshoot
Quote:
Originally Posted by PPLepew
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
|
|
|
30-05-2020, 14:02
|
#10
|
Registered User
Join Date: May 2020
Location: Pago Pago
Boat: Lancer 36
Posts: 265
|
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.
|
|
|
01-06-2020, 18:09
|
#11
|
Registered User
Join Date: May 2015
Location: edmonton alberta
Boat: 1992 lagoon 42 tpi
Posts: 1,729
|
Re: Yanmar 3ym30 starting troubleshoot
Quote:
Originally Posted by PPLepew
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
|
|
|
01-06-2020, 18:16
|
#12
|
Registered User
Join Date: Aug 2013
Posts: 428
|
Re: Yanmar 3ym30 starting troubleshoot
Quote:
Originally Posted by OloteleMtn
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.
|
|
|
01-06-2020, 19:17
|
#13
|
Registered User
Join Date: Jun 2010
Location: Easton, MD
Boat: 15' Catboat, Bristol 35.5
Posts: 3,510
|
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.
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|
|