OK, do I "open the holes.?
How do I pull the rocker assembly and clean them? Wire brush?
Elect a Wire Gauge Twist Drill which will match the Diameter of the little Oil Holes in the Rocker Arms.
Twirl the Drill Bit with your Fingers to clean the blockage out of each Hole.
Test that all the little Holes are then able to pass OIl alright by turning the Engine over with the Starter with the Ignition 'Off'...and after a dozen or so turns you should start seeing Oil gurgling up through the little Holes.
I think the corrosion we see here has accrued for a long time. This did not happen over night or in one season I don't think.
If the Engine is run and not run long enough to thoroughly heat up...it can not evaporate Condensation in the Crank Case.
And yes the best way to really clean all this Rust up, is to remove the Rocker Arm sub-assemblies.
And if removing them, best make some sketches to aid you in knowing how to re-assemble it in exactly the same way it is now.
Each Rocker has a little Part Number on it, and there are two Shafts.
Keep these two Shafts seperate...( or even just remove one dismantle and clean, set aside with a Note as for which one it is...then, remove the other ) and note the Order of the Rockers as per the orientation of each Shaft.
Or I suppose you could leave it on...and Plug all the Oil Drain Holes in the Head with twists of Paper Towel.
And use an Electric Drill with a Wire Brush Chucked up in it...and remove all the old Corrosion that way.
Bearing in mind you want to make sure none of it ends up being able to be carried down the Drain Holes where it would get into the Oil Pan Sump...
So Plug all those pro-tem and Plug them good...and figure to also manually clean the general area once done Wire Brushing all of it...
You can clean with any Solvent or Kerosene or Aerosol Carb Cleaner and Paper Towels or Kleenex...make sure all is really "clean".
And then remove the pro-tem Twists of Paper Towel 'Plugs' in the Head's Oil Drain Holes.
If you are careful I think you can do it and do a nice job of it even, leaving the Rocker Shafts on and abiding the cautions stated above.
Even for people familiar removing and completely dismantling the Rocker Arms, it is kind of challenging to keep everything noted somehow or other so it all goes back EXACTLY as it had been with no substitutions or goofs.
So leaving them on and cleaning them in place would be enormously less difficult.
