Mep 831a black smoke won't rev up and shooting flames out the exhaust

[Captainscall]

Does the injection pump look like it was ever messed with, removed, or adjusted in anyway?

It’s hard to say. I do not think it has been messed with but it’s hard to tell.


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[Captainscall]

I can tell ya from first hand experience if there is any air getting into the high pressure pump, even a little, it will spit and sputter and overall be a very unhappy little camper. I just went through that problem with the HDT that I'm working on. It sounded like the timing was WAY off and I think it was BUT it was caused by the fuel being injected very late due to the squishy air in the line.

I will definitely check this once my new injector arrives. Should be here on the 26th. Thanks!!!


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[CallMeColt]

It’s hard to say. I do not think it has been messed with but it’s hard to tell.




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Was asking because if it was installed wrong, you will have injection issues. But, it will generally not stop when commanded either if this is the case but it still could shut down. There is an inspection window to see if it is in the "fork" as it should be. In these videos, I talk about that;

Did you check the valves?

Flames coming out the exhaust is making me think timing, valves, or gasoline put in the tank.

I will definitely check this once my new injector arrives. Should be here on the 26th. Thanks!!!

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Whatever you do, don't use imitation parts with these. The "Chanmar" stuff is TERRIBLE. It may look the same but the quality is horrible. Make sure the copper washer or cup seal is good when replacing the injector. Yanmar calls them a one time use item, but if they're not damaged during removal, they will 99% of the time seal up again. Especially if it's the first time you have pulled it.

These are very simple little engines.

 

[Captainscall]

Was asking because if it was installed wrong, you will have injection issues. But, it will generally not stop when commanded either if this is the case but it still could shut down. There is an inspection window to see if it is in the "fork" as it should be. In these videos, I talk about that;

Did you check the valves?

Flames coming out the exhaust is making me think timing, valves, or gasoline put in the tank.



Whatever you do, don't use imitation parts with these. The "Chanmar" stuff is TERRIBLE. It may look the same but the quality is horrible. Make sure the copper washer or cup seal is good when replacing the injector. Yanmar calls them a one time use item, but if they're not damaged during removal, they will 99% of the time seal up again. Especially if it's the first time you have pulled it.

These are very simple little engines.

I checked the valve clearance. I have not pulled the head yet. Praying the injector fixes the problem. New injector expected to arrive tomorrow. Stay tuned…. Thanks. Merry Christmas!


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[Captainscall]

Not much of an update but my genuine Yanmar injector is delayed. Thought I would try and rule out an exhaust restriction so I removed the muffler. Still ran the same. I am really hoping the new injector fixes it. I have read that these are hard to bleed. I might try and bleed it with the engine running as I saw that suggested somewhere. At the moment it looks like it is blowing drops of diesel out of the exhaust.

Hope everyone had a Merry Christmas.


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[DieselAddict]

They aren't hard to bleed. Make sure you have good fuel going to the pump, loosen the hard line on the injector, turn it over until you get fuel weeping from the fitting, tighten and start it up. It will cough a bit and clear up in a minute or less.

I hold the compression release down when priming the hard line. Its a little easier on the starter.