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Nope, he is not. He doesn't even have the internet, I am the tech support. In these situations you not only need the internet but the capability to do the work. I went to school with my neighbor and I have known him and his dad for 20 years. Swapping the injectors is a great idea and I will do...

Ok I adjusted the valves yesterday and we started it again it does run lots better but there is still a issue . It sounds like there is a miss and when I cracked the injectors the same cylinder that had the rocker backed off appears to not affect the idle speed when I crack the injector. I...

All right I screwed up , it is a M923A2 with a Cummins 6cta. Where are valve lash specs? .012 and .024? Intake and exhaust.

I just went out and pulled valve cover. 1 intake valve was probably 75% backed off they all need adjusted. I was working alone so I did not check them all and it is a pain to jump down and bump engine over. Any of you gurus know where in the TM the specs/procedure are? I assume -20 ?

Its is the Cummins 250, the smoke looks like normal diesel smoke gray-ish as in unburnt fuel. Would a short video help? I'm really trying to help the guy out before he takes it to have it worked on. To me it is weird that it happened so suddenly, that's what made me think valve train.

My neighbor has a M931 (I think) and it is not running right. We did a local homecoming parade last week and his truck started to run bad on the way home. He was idling in traffic and said he heard the engine sound change. He went to take off and the truck chugged and black smoked. He made it...