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Jwilliams

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Reply with quote  #21 
It needs boost to put the correct amount of fuel to the motor. The pump puts the amount of fuel it needs by reading boost pressure off if the head. Hook the boost tubes back up and itll probably straighten itself out
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Reazy4x4

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Reply with quote  #22 
Quote:
Originally Posted by Jwilliams
It needs boost to put the correct amount of fuel to the motor. The pump puts the amount of fuel it needs by reading boost pressure off if the head. Hook the boost tubes back up and itll probably straighten itself out


From my understanding.. The AFC uses boost to move the foot forward and allow more fueling while under a heavy load. in this video though.. i dont believe theres any boost being created, and even at idle there is still white smoke. 

Hell, i could be wrong though.
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Reply with quote  #23 
Quote:
Originally Posted by Jwilliams
It needs boost to put the correct amount of fuel to the motor. The pump puts the amount of fuel it needs by reading boost pressure off if the head. Hook the boost tubes back up and itll probably straighten itself out



it worked just fine the other day....

i've run a bunch of different cummins motors like this and not a one of them have acted like this...

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Reply with quote  #24 

Bumped the timing up to 28 degrees and ran it.... seemed better, but still busted up at full throttle.... or part throttle, but at a higher RPM than before..


Then pin timed the pump & motor..... Awful. couldn't get it much past idle without going to white smoke and coughing.


Pulled all the injectors.... took the nozzles off and cleaned them up. Much, much better. still pin timed and the smoke is now a heavy haze, instead of fogging out the whole place. Still pin timed.


Going to try a different set of injectors tomorrow....

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Reply with quote  #25 
different injectors made no difference...
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grizzilla06

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Reply with quote  #26 
Does the injector pump itself need a rebuild?
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Reply with quote  #27 
Quote:
Originally Posted by grizzilla06
Does the injector pump itself need a rebuild?


it's the only thing left... the next step is to try swapping it out with a spare and see.

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Reply with quote  #28 
we decided to plumb in a radiator and run it up to operating temp and see what it does....

no change. however, we noticed some moisture around the head gasket area. we eventually determined that the head gasket is seeping oil/compression out.

the owner is going to change the HG here in the next couple days and see where we stand.

the current thought is that the HG was already weak/seeping some in the original truck. the original truck was a leaker. so it was hiding behind other leaks and probably already on it's way out..... then, we bumped up the timing (increasing cylinder pressure) and that was the final straw for the HG.

we'll see....

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Corey

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Reply with quote  #29 

did you ever get to the bottom of this


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dus10

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Reply with quote  #30 
Damn 28*, lol i just bumped my timing to 26 only cause my egts are way high and im studded and o ringed. It did make a world of difference.
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Reply with quote  #31 
Quote:
Originally Posted by Corey

did you ever get to the bottom of this




no. head gasket was leaking, but wasn't the problem.



Quote:
Originally Posted by dus10
Damn 28*, lol i just bumped my timing to 26 only cause my egts are way high and im studded and o ringed. It did make a world of difference.


yeah,  that was just to see if more timing would help. it's back to being pin timed right now...

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dus10

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Reply with quote  #32 
Did yall possible loosen the 2 nuts on the side of the delivery valve holder and maybe get the barrell out of whack?
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Reply with quote  #33 
Quote:
Originally Posted by dus10
Did yall possible loosen the 2 nuts on the side of the delivery valve holder and maybe get the barrell out of whack?


the pump has been rebuilt at some point..... but none of us have touched any of the barrels, or hold down nuts since it's been owned by lee.

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Reply with quote  #34 
Tried a different, known good pump....

it was a 175hp pump with the timing at 16.5 degrees and had the "washer mod" done to the gov springs.

it seems to have more pep, or crispness in the throttle.... but will still smoke and bust up at high RPM.

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dus10

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Reply with quote  #35 
ive got 2 extra 12vs both p pump ifs yall need. too bad we didnt know your truck was being hauled by our buddy, we could have maybe set something up..


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wrongway

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Reply with quote  #36 
I hate to ask you at this point, but did you verify that the pistons are coming all the way to the top? You may have bent a rod because you are definately down on compression. Hence the white smoke and breaking up. I do decompress my race engines and they act exactly the same way until it reaches operating temp. You might want to do a compression test just for the heck of it. Or, let it warm all the way up and see if the smoke goes away. Hope this helps
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Reply with quote  #37 
Quote:
Originally Posted by wrongway
I hate to ask you at this point, but did you verify that the pistons are coming all the way to the top? You may have bent a rod because you are definately down on compression. Hence the white smoke and breaking up. I do decompress my race engines and they act exactly the same way until it reaches operating temp. You might want to do a compression test just for the heck of it. Or, let it warm all the way up and see if the smoke goes away. Hope this helps



TDC was verified by a dial indicator on the valve stem.... but i don't think he checked anything when the head was off.

compression is 380-400 psi on all cylinders. i believe that was before the head gasket, i'll confirm that today.

we installed a radiator and let it run up to operating temp and it still does it.

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Moparman318360

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Reply with quote  #38 
What did you end up finding out. Im haveing the identical problem on my 12v
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Reply with quote  #39 
put the truck together and drove it.

it cleared up within a couple miles.

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Adam Travis

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Reply with quote  #40 
Sounds like the problem might be stock engine and injectors. Usually want to build the entire engine before you upgrade anything fuel related. If the timing is perfect and not slipping, idles fine, no clanking from inside, oils changed, fuel filter is fine, and that there isn't any water in the system, it could be that you just upgraded the wrong piece first.
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