synchronizer

Just picked up a 2004 Explorer NBX today with a 4.6. Bought it from a girl who says she changed all the coil packs and when she went to crank it, it now has a squealing sound coming from the driver side valve cover area. Someone checked the codes but cleared them and it has not been run enough...

I’ve got the infamous camshaft synchronizer squeaking sound on cold starts. I had a shop replace the lower intake and camshaft synchronizer gaskets last week and the truck has developed a squeaking sound in the rear of the engine. I took the belt off and the sound is still there. The mechanic...

Can someone please tell me if the cam sync is supposed to sit flush? I can feel the gears twist as they mesh but the "shiny" exposed portion (red circle) has me second guessing myself. Please ignore the orientation of of the install tools arrow, I can explain if necessary.