M820 missing and smoking like mad - help needed

[802dot1q]

I came down to visit the m820. We spent some time checking things over and after replacing the batteries got her started. There is a definite miss on idle and she smokes like mad at idle and through the rpm range. I even get some sparks and a bit of flame from the exhaust. Anyone have any ideas about what might be wrong?

 

[papabear]

Injector stuck open...raw fuel burning from the stack??

 

[jimmcld]

Does the pressure gauge for the cold start show any pressure while it's running?

 

[802dot1q]

Does the pressure gauge for the cold start show any pressure while it's running?

I don't remember seeing it move.

 

[SETOYOTA]

subscribed

 

[jimmcld]

If the cold start pressure gauge shows pressure, it could be pumping raw fuel into the intake manifold.

 

[802dot1q]

[media]http://www.youtube.com/watch?v=WhTyoKs2_YE&feature=youtube_gdata_player[/media]

 

[rwbrown72]

WAAAAAYYYYYY Too much smoke. Injector, cam, or injector timing.... just guessing. Might also look at the priming pump. Easy to remove and see if the little o-rings are letting in fuel. Again...just guessing.

 

[papabear]

Where's the front of the air cleaner? Did you spray ether in the engine before cranking??

 

[802dot1q]

Yeah it got a squirt. Why do you ask?

 

[papabear]

That explains the "knock" I heard on startup then.

 

[khandoh]

I know she was not coughing up that much smoke when I saw her...

 

[63foxtrot]

take the valve covers off, check your rocker arms.

 

[augiedoggy]

This thread is a good read and may help your problem:

http://www.steelsoldiers.com/5-ton-up/73256-nhc250-valve-injector-overhead-adjusting.html

also try running the engine with a fuel can underhood fuel hose connected directly to the pump inlet from fuel can.

good luck

 

[802dot1q]

Augiedoggy, thanks for the link. Sounds really close to the problem. In about 20 minutes of running I had a lot of fuel in the oil too.

 

[Scrounge41]

Just found this thread and realized my m109 is sitting next to your truck. Any luck yet on the shipping?

 

[derby]

Ether........yikes! I am with papabear on that knock. It does not sound like it went away. Did it run fine when you parked it? I hope you did not detonate anything. I would refrain from high rpm's until you figure out what happened.

 

[Shoprat 19th Engr]

There is a diaphram in the back of the fuel pump that will cause that if it has a hole in it can get the replacement at any cummins dealer

 

[Ord22]

it sounds like a bad injector or bad roller cam for the injector.

 

[802dot1q]

Figured out one of the problems. Some knuckle head didn't have the push rods seated under the intake and exhaust rocker arms. They were moving up an down from the cam follower - just not opening any valves. I don't want to even think about all that fuel going in there with no way to get out. Good news is she fired right up and no more missing!!! I have a pretty nasty fuel leak to fix before doing any more troubleshooting. Here's a pick of what I found when opening the rocker box. I think once she gets a proper valve adjustment and injector adjustment she'll be just fine.