Hello! This is my first post here.
My girlfriend and I are working on an 84 B2000 we bought cheap with a blown head gasket.
Luckily the head and block are both in good shape and measure nice and flat.
Unfortunately, the inside of the valve cover and the entire rocker assembly were both coated in a lot of sludge. Maybe coking? The head cleaned up nicely but now we're on to the rocker assembly.
I took the assembly apart and was surprised to find what seems to be very old brittle plastic (or rubber) ring inserts inside the ends of the rear rocker shafts. There seem to be three of them, each about 4 or 5mm thick (didn't actually measure), in each shaft. I tried to clean one and it just crumbled in my hand.
I know about the rubber o ring that goes on the center tube and is inset into the middle bearing cap but I have no idea what these other "inserts" would be for. I have seen no mention of them in either of our repair manuals or online.
Does anyone know anything about these inserts?
Nice and clean head:
Rocker assembly disassembled:
Looks like I forgot to take any pictures of the inserts themselves but I can if that'd be helpful.
Thanks in advance for any help,