I've just taken my engine apart again for another rebuild and have noticed that on top of the block [where the head screws would screw into there are two faint circular scores marks in the metal. The piston sleeve also has half a circular score mark on top. Any idea what might cause this?
Maybe a rock fell in when you took the glow plug out? I'm not sure what you mean by "scores" though... Pctures would help alot!
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Here you are, its quite hard to see as they are so small. Might need to hold control and press + and few times.
It looks like when you were putting the head on at a previous time the screw didn't line up with the hole and made those marks. They don't look inhibiting from the pics though.
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