Hi guys,
I have a problem with oil pressure in my prelude 4.gen (H22a2)... I changed motor oil and lost motion assembly (LMA) and after i crank up the motor then the lamp of oil pressure switch light up. (old oil: motul 300v competition 15w50, new oil: castrol magnatec 10w40)
So i changed the oil pressure switch, oil filter(original honda) still lights...
I had prelude in a servis on the check of oil pressure and they told me there is no oil pressure in block also in head.

So i changed the oil pump and oil screen gasket (oil screen is clean) crank up the motor and lamp still lights.
After i take down an oil pan and oil screen and i check new oil pump it looks dry(no oil inside)
So I took out main bearings and connecting rod bearings there are a photos (Bearings photos) i think they looks fine...
Do you have any idea what could be my problem or any solutions??? Thanks for help

 

When you changed the pump, did they prime it to build pressure before trying to run the engine? You should always unplug the injectors and cycle the engine at 30 second intervals until the oil light goes out, giving a few minutes rest for the starter in between cranks. Once the light goes out, then you can plug in the injectors and fire the engine up.

Is the oil pan dented up, and blocking oil flow into the pickup tube?

 

i only started the engine. So i must unplug injectors and prime it? The oil pan is new one.

 

Yes the oil pump must be primed when replaced, or on a new engine build. Pretty much any time you drop the pan it should be done In my opinion. On a new build it usually takes me 2 or 3 30 second cranking sessions to build enough pressure and make the light turn off.

 

oh thanks i try it, what about spark plugs must be unscrewed?

 

Shouldn't make any difference, if they are out the engine won't be compressing air much, so it will spin easier against the starter if you want to pull them. On my car I leave them in, and just unplug the resistor box for the injectors.