Oh, That's why they call em a cumapart... And this metallic tapping is going to cost more than a used 6.5 complete engine. Suspecting valve guide or tappet issue. Capped fuel line to #6 and still no change, but, when we tighten down the valve lash on #6 to 0 it goes away.
Yeah Yeah, just a matter of time...
Yeah Yeah, just a matter of time...