Oil pressure in a first Nissan 2.2

Hello someone can tell me why I have no oil pressure in a first Nissan 2.2 Motor D-YD22, and disarmed all the grease pump that is placed in the lower cover of the distribution nosele sees nothing wrong but and caused even removing the oil filter and turning the engine and does not come out or drop of oil by the filter port All good to someone, thanks and greetings

Hi, Moyano, look at the oil pump has a relief valve some veses is struck, it is a piston with a spring that piston has to gently delise in an internal shirt of the pump, but notice if the pipe. What is the oil oil.

I happened to me that the bomb was a blow of nothing and with that it had to not climb lubrication, I recommend changing it if the ok valve is not locked?