CAT C15 /6NZ trouble continues

I'm going to put your idea to CAT. See what they have to say.
You have to pull the head I imagine, or can it be done on the truck. But then filings from cutting get into the cylinder, am I right ?

 

Gotcha. I'll keep it to myself until we figure this out

 

Good advice. Thanks again.
Came to a stop but gotta go again in a minute.
I'd like to send you some more info, soon as I have anither few minutes.

 

Yes sir, I agree.
Ever since CAT got out of highway truck engine build, they have really cheaped out, much more now than they have over past years when they decided to go reman with in frame parts, primarily injectors.

 

Im stuck right now with CAT warranty. I start over riding their policy and kiss my platinum warranty good by.
The strange thing is she pulls like a wet dream from a stand still. 140,000+ gross and it whistles Dixie and I can't shift fast enough. Part 2...faster the road speed and here comes the stumble as shifting times farther apart and engine loads up.
Part 3...65 mph and I slow down to 30 mph as I crawl around the clover leaf with my top heavy / 13'6" /52ft end dump /140,000 gross, followed by immediate full throttle to get back to 65 mph, and it pulls like an Alberta wild fire. Strong, smooth and problem free.
Part 3...traffic suddenly slows and takes off again but my engine won't recover, pops/ stumbles etc with huge power drop.
One of the ways I envision the issue is, as long as engine speed spinning the fuel pump matches fuel demand, then all is well. Which corresponds with starting from a dead stop, when being on / off throttle to shift , with rapid close together drop-offs in RPM's allows fuel to be compensated with zero load on engine for 2+ seconds between full throttle applications. And also corresponds with being off the throttle rounding a clover leaf.
But the above doesn't jive with its ability to pull hard problem free when I leave the clover leaf behind and have foot to floor to attain highway speed, unless there's a return fuel issue and at this high torque the engine is eating the fuel which would otherwise cook in the head due to inability to get back to tanks ?

-What a challenge !!