Hmm what would cause them to stick mate? Carbon and such is it? would your advice be to get them out and cleaned up?
Also, my haynes says not to grind the valves on a 16valver, why is this?
It could be carbon, but more likely to be a bent valve causing friction.
The only way I know to determine a bent valve is to do a compression first before strip down to determine if the pressure is all over the place or no pressure at all? Then I would proceed to strip our valves, springs and piston rings to see if I can see the culprit. (in between do a wet compression test with light oil to see if it goes past the rings)
But generally I clean up carbonised parts with "OVEN CLEANER" All I do is mark them up so I remember the order they go in or get plastic bags mark them one to four then spray oven cleaner foam into the bags then leave them over night. By morning you will be shocked how clean they have become after the Oven Gnomes have done their job!
Honning is for any scratch marks on the crown bores the valves sit in (proberly due to bent valves).
Valves are cleaned via chemicals! using abrassive material on the valves could cause damage hence chemical clean. Some people just polish them up afterwards with a very soft buffer pad
nothing that will take material away from the valves as the valves clearance is specific and to the micron!
A clean valve is easier to inspect for damage than a carbonised one! Worst case you buy a new set if the carbon was holding them together. Remember the valves are sodium filled so if they break that stuff is not nice LOL!
