Originally Posted by jetman
Originally Posted by LeakySeals
So this 2007 6.2 L92 has the AFM oil galleys, relief valve, valley pan, lifters, but not the PCM programming to activate it?
It does not have an AFM valley pan. Mine is smooth, no ridges. Lifters? oil galleys?
Was curious if you had the AFM lifters. Assuming the flat valley pan was factory installed, assumption is you don't. Hopefully not.
Originally Posted by clinebarger
Originally Posted by LeakySeals
So this 2007 6.2 L92 has the AFM oil galleys, relief valve, valley pan, lifters, but not the PCM programming to activate it?
It was only the early production L92's that had all the AFM hardware (Built Prior to April 1, 2006 with 6.2L Engine RPO L92 These engines were built with AFM Hardware but the AFM system was disabled) from Bulletin No.: 10-06-01-007C
They updated that TSB to "D" which is just the replacement of the 8 AFM lifters rather than all 16. In addition to other conditions like wrong grade oil poor maintenance, etc they mention aeration of the 8 AFM lifters contributing to ticking noise. From what I read the relief valve is installed with the high volume pumps used with activated AFM. That valve should only be blocked off when AFM is not in use AND the high volume pump is replaced with a standard pump. So if the engine never had AFM, has the standard pump, does it actually need that valve? Any valve living in the crud of an oil pan is at risk of getting stuck, rather not have it if possible.