• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

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

Captainscall

Member
36
60
18
Location
Springfield IL
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!!!


Sent from my iPhone using Tapatalk
 

CallMeColt

Well-known member
Supporting Vendor
1,079
1,589
113
Location
Wilson County, Texas
It’s hard to say. I do not think it has been messed with but it’s hard to tell.




Sent from my iPhone using Tapatalk
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!!!

Sent from my iPhone using Tapatalk
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

Member
36
60
18
Location
Springfield IL
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!


Sent from my iPhone using Tapatalk
 

Captainscall

Member
36
60
18
Location
Springfield IL
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.


Sent from my iPhone using Tapatalk
 

DieselAddict

Well-known member
Steel Soldiers Supporter
2,556
2,156
113
Location
Efland, NC
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.
 

CallMeColt

Well-known member
Supporting Vendor
1,079
1,589
113
Location
Wilson County, Texas
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.


Sent from my iPhone using Tapatalk
Sounds like it may be a worn out or stuck injector then. They can be opened up fairly easy & cleaned. Maybe some old gunk is stuck in there making it hold open & then the vapors are blowing out into the exhaust?
 

Captainscall

Member
36
60
18
Location
Springfield IL
Definitely hope it’s a stuck injector. I attempted to disassemble and clean it but managed to break off the top of the injector in the process. New one should be here Dec 31. Praying that fixes it. I will definitely update when it comes in.

Thanks for all the videos you post. I have watched them all and learned a lot. Thanks!!


Sent from my iPhone using Tapatalk
 

CallMeColt

Well-known member
Supporting Vendor
1,079
1,589
113
Location
Wilson County, Texas
Definitely hope it’s a stuck injector. I attempted to disassemble and clean it but managed to break off the top of the injector in the process. New one should be here Dec 31. Praying that fixes it. I will definitely update when it comes in.

Thanks for all the videos you post. I have watched them all and learned a lot. Thanks!!


Sent from my iPhone using Tapatalk
Wow, if the top broke off trying to take it apart, I'd guess it got some moisture in it & it rusted. Glad the videos were helpful!
 

Captainscall

Member
36
60
18
Location
Springfield IL
Well the saga continues. New Yanmar injector made no difference. The only other thing I can think of is to replace the injection pump. I swear I have checked everything else.


Sent from my iPhone using Tapatalk
 

biscuitwhistler37

Well-known member
315
925
93
Location
Michigan
I think I might have overlooked something. Would a missing copper injector washer cause it to run the way it is??


Sent from my iPhone using Tapatalk
I want to say yes, because without a proper seal, air will be allowed in, but the other guys know a lot more than me. FWIW, copper washers are cheap and it definitely won't hurt to have a good one installed.
 

Guyfang

Moderator
Staff member
Moderator
17,029
24,888
113
Location
Burgkunstadt, Germany
I have been keeping my distance since I put my foot in my mouth at the beginning. But here is my best guess, and comments.

Can not be the injector pump, unless its the wrong IP? Too much pressure? But this is a far fetched idea

Could the IP out of time? Shooting fuel into the jug when the exhaust valve is open, or partly open? The exhaust would be hot enough to combust the late injected fuel. The only time I saw a Yanmar set the muffler wrap on fire was because something was wrong with the IP. I did not get invited to the repair party, as the Commander of that unit did not want civilians in his Motor Pool.

I would think, that if the copper ring is missing, that there would be a loss of cylinder pressure and that would not affect the engine the way yours is running. When using the pull rope, is the engine real easy to pull over? Like it is not building up enough pressure? Can you see/hear/ feel compression when you pull the engine over with the rope? Or when it runs?

Would it affect combustion if the Injector was deeper in the cylinder? Without the copper ring, the Injector would be a tad deeper in the jug. Would that affect/delay the combustion sequence? Might that mean the combustion sequence is still going on when the exhaust valve starts to open up?

My best guess/feel would be timing. That or the exhaust port is not closing right/ or soon enough?

You have eliminated the Injector. I do not see how the IP could over pressure the Injector. So as long as the muffler is clean, how else could the darn thing try and set itself on fire?
 

Captainscall

Member
36
60
18
Location
Springfield IL
Thanks for the replies. I swear I checked for that washer when I first pulled the injector but it certainly is not there now.

You can not pull the engine over with the rope unless you pull the compression release. It starts easy but will not rev up, smokes like crazy, and seems to shoot droplets of diesel out the exhaust. After running a few min the muffler starts glowing orange. I will await the copper washer and if that does not fix it will double check IP timing. I am learning a lot on this one.

Thanks all!!


Sent from my iPhone using Tapatalk
 

CallMeColt

Well-known member
Supporting Vendor
1,079
1,589
113
Location
Wilson County, Texas
You need the washer. All the washers/spacers are CRITICAL to timing on these.

From here, it sounds like you have a valve issue & compression/combustion is getting out the exhaust valve, causing the heat, un-burnt fuel, and fire.

Try going tighter on the valve clearance than spec by a bit.
 

Captainscall

Member
36
60
18
Location
Springfield IL
You need the washer. All the washers/spacers are CRITICAL to timing on these.

From here, it sounds like you have a valve issue & compression/combustion is getting out the exhaust valve, causing the heat, un-burnt fuel, and fire.

Try going tighter on the valve clearance than spec by a bit.
Got it thanks!! Will update once the spacer arrives!! Appreciate it!!


Sent from my iPhone using Tapatalk
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks