Originally Posted By: Geauxtiger
OP here.
Well, the verdict is in.....not good.
The_Eric may have had the closest guess. Obviously an oil gallery became plugged. The back half of the valve train on the passenger side was DRY. Extreme scoring of cam. the top of the furtherest back spring was actually dry to the touch and had 'dust' (metal filingg?) visible. Can't really get in there to investigate further since the engine is shoved so far under the dash.
This may explain why the truck began using oil for the first time this year...~1 Qt per 5kmi. May have damage throughout engine due to floating metal debris.
Choices - rebuild top end with 12 mo warranty or install Ford reman engine with 3 yr 100K warranty. After much thought and surfing used truck prices, decided to go with the reman engine.
The good news is that my 7-8k OCI regimine using a variety of oils most discussed in this forum resulted in a pretty clean valve train...just some light varnish on the cam between lobes (and maybe that formed due to very low oil flows for however long this problem has been developing). I may never get to find out what plugged the oil gallery, but I at least feel good that it wasn't due to sludge.
Yep, sounds like the one I did, except for there was no real damage because it was caught early enough.
Like bdcardinal said, it could have been filter media or silicone gasket material. The one I did was definitely silicone type material.
I'll add to the list who say that it was wise to replace the whole engine. I know I'd have a hard time trusting it.