Smokes when spinning over - NO FUEL!

[WarWagon]

I have the intake and turbo off to change injectors. I get a pretty good single puff of white smoke when spinning the engine over. As the IP and lines are dry and loose to prime there is no fuel involved.

I am at a loss to explain the puffs both out of the manifold and passenger EGR port in the head. Oil from valve stem leak or ? :skep:

 

[bison]

Coolant leak(headgasket starting to fail)??

 

[schiker]

I don't think it takes much residue to smoke just a puff seen right at the motor. At the tailpipe you might need some fuel but If motor is building compression (all injectors and plugs installed) it could be residue right at manifold I would guess. If its not really pumping a whole bunch of air or sucking and blowing from open ports and almost blowing smoke rings I think you are more prone to see a tiny bit of residue type smoke.

 

[WarWagon]

It is almost firing from it as you can hear the starter speed change. This went away after a few priming tries, but, still has smoke in a puff.

I am thinking oil from bad valve guide or something like spilled fuel during the change. It is a puff from 1 cylinder and steady at that.

Changing the injectors due to lots of white smoke on start up and a miss till the engine is loaded or warms up some. (The amount of rust in the IP from the wet buggy fuel makes the injectors junk no doubt.) All 8 glow plugs are good as I tested them to orange in the engine by jumping the controller.

 

[littleboy]

I've seen a lot of different diesel engines do this and always wondered why but never checked into it.

 

[schiker]

When I start my old ford tractor and forget to push the mechanical fuel shutoff ? Back to "on" it will hit and puff sometimes especially when I am spritzing ether but real early before it has much ether to burn Its like it dribbles fuel or has residue that fires somewhat every 2 or three compression strokes but not enough to really start up.

My son has a toy battery powered train like steam that puffs smoke from cooking oil in the funnel. I have never added more oil and occasionally it still puffs after 1 - 2 yrs on I guess a couple drops of oil.

 

[schiker]

Let me back up and say the tractor doesn't hit much I can tell its not firing on time and now know to check fuel shut off but it puffs a bit note I am stretched arms trying to spritz the intake and turn the key at same time