scotch
+1y
Don't be surprised if some of them required some pliers to pull them out - depending on condition. Just try to pull them straight out and not damage the ring on the outside of them if they don't fall out.
If you find some with excessing wear on the top, yo might want to replace them. You can usually pick up them up by the set cheaper than buying them individually. So if you need two or three, I would probably just replace them all.
I have a couple of videos of the cleaning and then re-priming process on this thread:
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Also, as long as you have the valve cover off, there are a handful of things that you might want to address at the same time (PCV Valve Grommet, Breather Tube, Resonator O-ring). I've written them up here:
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