Engine knock, valve lash

[hackengineering]

Ok i know folks will think i am crazy on this one but i have been having a valve knock ever since i installed all six injectors. I replaced the cp3, fca, and ran additives. This noise is only when the engine gets to operating temp and is between 1200 and 2000 rpms. I live at high elevation (9000) and rarely see anything low enough to see if it maters.

Now on to the valve lash. So i have set the valve lash now three times in two months. Each time i do not find anything extremly out of spec but i do seem to need to adjust a few each time. The noise is completly gone for almost 1000 miles and then it creaps back. I tow pretty heavy usually multiple passes that really get the EGT's up there. Everything is tourqued to spec each time. Engine has 128,000 miles on it and i have only had it for 7,000 of those so i can not tell much history of this truck. Injectors are II 50hp tips.

Anyone else heard of the valve lash changing so soon.

Thanks

 

[Tinman]

Are you sure it's the valves? Maybe it's timing rattle. What are you using for timing? The addition of the injections advances your timing.

 

[hackengineering]

I agree they will advance the timeing and at this time i have no chips or programers on it. I am sure the valves make the noise, whither it be timing or not it is much quiter after i do an adjustment.

 

[Missouri Mule]

Could one of the valve adjusting nuts becoming loose? I had one that a mechanic did not tighten down, it made a lot of noise.