Forum for air cooled diesel engines and clones

[OldRedTractors]

Thanks - I'll give that a try. Didn't have time today, and unfortunately it's now going to be a week or so before I can get to re-installing the pump and giving it a go with the jumper wire.

OK, well I must have f-d something up in re-assembling the pump, as now it won't even fire. I was very careful, and clean, and paid attention to the way parts came out, but clearly I didn't get something back together correctly. Does anyone have a link to a exploded parts diagram of the injection pump?

Argh...

 

[winston1]

May not even be close but take a look at page 49. http://dieselgeneratorsonline.net/documents/etq170f178f186fpartslist.pdf

 

[OldRedTractors]

Thanks! It's close, but the delivery valve is different in the one I have, or at least there are a few more bits in the one I took apart. I'll disassemble it again and see if anything obvious is amiss - perhaps I installed the plunger 180 out, but I was careful with checking that...

 

[90cummins]

 

[OldRedTractors]

Thanks 90cummins! I think I found my mistake - I made an error with re-assembly of #10 in your drawing, which doesn't detail the pressure valve assembly, or whatever it's called. Obvious once I looked at it again of course.



I had it flipped the wrong way - the inner valve assembly where the awl is pointing. It will go together wrong quite easily if you're not paying attention to how it's supposed to work... looks like no harm done, so one more try tomorrow!

 

[Ilikeurtractor]

Just a note I have the 186F engine and it doesn't have any of the electrical parts for fuel control, oil shutdown, etc. It exhibits the miss at high speed. Never seen any particles in the oil. Runs fine up to about 2800 rpm and then the miss and white smoke. Leads me to believe it is a restriction in the air flow into the cylinder or potentially a valve float issue as someone pointed out earlier (I would doubt this though as these are relatively slow speeds for typical valve float), or even something causing extremely late timing at the higher speed. It seems odd this would get worse over time as some have described here. Mine was this way since the first time I ran it out of the box. Runs great otherwise though. Since I don't use it for a generator I can keep it below the "speed of death and destruction".

 

[90cummins]

A restricted air filter typically results in black smoke.
I would check the injection timing which is realtively easy with basic hand tools.

90cummins

 

[90cummins]

Here is a link for all Yanmar L Series diesels.





http://dawinfo.com/LV-Series-Service/LV-Series-Service-Complete.pdf


90cummins

 

[Ilikeurtractor]

A restricted air filter typically results in black smoke.


90cummins

True. However, I'm wondering if it's restricted enough there might not be anything to compress and not enough heat for combustion which generally equals white smoke. I have an air shutoff on one of my tractors and as soon as it's pulled the engine dies and no black smoke - although I don't recall seeing white smoke either now that I think about it. I guess I'll have to play with that some. Maybe if I crank up the fuel and pull the air shutoff I'll see what happens. The flaming exhaust tells me it is either missing heat and/or oxygen in the cylinder when fuel is injected or the injector is activating after the exhaust valve is open which might go back to the valve float theory, non-sealing exhaust valve, or even excessively late timing. It could also mean the fuel charge is firing when it hits air which could be after the exhaust. That would mean there would have to be enough residual heat on the muffler to cause ignition too though. I'm not sure if this video was posted already but I keep thinking about it when I return to this thread:

Diesel Generator First And Last Start - YouTube

 

[Ilikeurtractor]

Assuming the problem in the generator video I posted above is the problem we are having I'd have to eliminate the restricted air theory. The combustion is taking place too far into the exhaust (too close to the cylinder head) for it to be starved of air. That narrows it down to an exhaust valve or timing problem (I think).