Archived 3rd Gen Cummins Ticking/rattling/exhaust leak??????

[CStraface]

My 05' Cummins has developed a distinct ticking noise when above 1000 RPM. It gets much louder when doing 50 and I let off the gas. So in other words, the engine is making the noise even when I am not accelerating, but RPM's are still above 1000. Noticed it after a hard drive with my "hot juice" on level 3. Stock transmission, so when on level 3 I redline for a couple of seconds before it can shift into 4rth. It takes a while to get from 3rd to 4rth. Truck makes the noise in neutral, and when AC is off. The noise sounds like an exhaust leak, but all gaskets seem fine. Noise sounds like it is comming from rear of engine from a stethascope. Truck starts and idle's normal. I am thinking it's an exhaust valve, but I need help... . anyone know what I could be experiancing?????? Thanks, Chris

 

[HeberRam]

Maybe??

Changed injectors on my 05' recentley, and I had a ticking -thumping noise and it sounded like it was coming out the exhaust mainfold and air box. I had to re-adjust both the intake and exhaust valve clearances and the noice went away, to it's normal sound. I think I must of "twicked" the setting on one of the exhaust valves changing injectors... I suspect it may be an exhaust valve.