C3G engine head removal - Twingo 95

[ronenfe]

I opened the oil pump to clean and inspect it. The retainer of the oil pressure valve which looks like a washer wasn't seating properly when I closed the oil pump or it is supposed to be put in one direction. It deformed the bore and the washer and it couldn't go in the bore anymore until I removed some material but now it sits tight instead of free.
Watch when you do it.