my yanmar 2gm20 will not start

[henrystanley]

I replaced the prefiter on my yanmar , but today after running the engine for a few minutes , it stuterred and died . I suspected the problem was air in the pipes . I have bled the low pressure system with success - got clear diesel . and relaced the fine filter whilst bleeding the system . The high pressure system is another story - i followed what the manual says - this is meant to be simple ! - please help , i have spent all of today trying to fix the problem .I think am going slightly mad.

x
ta

[USCGRET1990]

Air in the high presure side is the most devestating. It will act like a spring and not let the liquid come up to required presure to move on. Look for a place to bleed off this air close to the nozzles or injectors.

[Rickm505]

When you say that you've bled the low pressure system, is that to the fuel bowl which houses the secondary filter or did you crack the input banjo at the injector pump?

Rick in florida

[henrystanley]

Yes , i cracked some of the nuts along the fuel injection ( high pressure system ) , there is free flow of diesel as far as the low pressure end i.e where the fine filter leaves .I stopped here ,for fear of causing further, expensive damage .

ta

[henrystanley]

Thanks guys ,i got it working this afternoon - lunch time.The problem was onthe high pressure system , just after the fine filter .Its a great moral boost for me .

Lessions learnt
Know your stuff -
Get a manual and read it
To bleed , be systematic
Persevere- access to the engine parts can be difficult - you need to be a contortionist.
Have the right tools .
x
ta

[Rickm505]

Henry

That's still low pressure there, and I need to do this as well with my Yanmars when changing secondary filters.

Rick in Florida

[henrystanley]

Whatever ! - i am just sooo relieved i got the engine working again.

x
ta