I had a '03 come in backfiring thru the intake. No problem get out the WDS power balance says #7 bad. Pull right valve cover and all rockers and pushrods look ok, uhm. Run relative compression #7 down 12%. Pull fender liner trim a/c box and pull glow plug, compression 420 psi. What the heck?
WDS lied to me, pulled left valve cover and #8 exhaust rocker was shattered completely in half and push rod looked like a boomerang.
I work in a very small shop (converted Subaru dealer yea) so the truck has to go out while waiting for parts. On the way out the truck goes quiet still skips but no more popping noise. Thought about it for a minute but it was 1 o clock on a Saturday so I left for the day.
Parts come in, cab came off, both cylinder heads off, then I found the reason for no more noise. The #8 intake rocker split also. Well now the truck is in a million pieces and I only have one bay and parts have to be ordered. So I decided to put the truck together as far as I could, both heads back on (one new) intake, turbo, fuel system, harness, ect, up to the left valve cover. All head bolts and rockers were installed and torqued to initial 65 lbs ft. But I didn't want to torque out of sequence so I stopped until new rocker came in.
New rocker came in torqued all large headbolts then I read the last step in the process and I felt sick. I still had to tighten the 5 small bolts at the top of the head, which are now buried under the intake, turbo, fuel system and harness!!!!!!!!!!! One step forward and three back.
Well truck is done and I'm here to tell you it is the fastest 6.0l I have driven yet.
One last note the fuel gage was on empty when I started it and I was cussing the customer, until I realized I forgot to plug in the connector under the left rear of the cab.