The V8 Owners Forum -

Basically it's got to be one of 3 causes:

1 Oil starvation: low oil, cracked blocked or loose oil pick up pipe, oil not returning to sump, blockage in feed galleries in block / pump.

2. Oil leak : leak past relief valve, through bearings, lifters, rocker shafts, cracked block / head etc

3. Wrong gauge readings.

As you are confident 3 is not an issue I would focus on 1 and 2, you say you have another engine, why not swap the oil pumps over?, if that does not work i would suggest you remove firstly try it with the oil slightly overfilled and if that has no effect remove the sump and check the oil pick up.

Need more ideas..

I fit new std piston/valve + spring, and i prime the oil pump, and i notice that there is a plash noice in the oil system, Never heard this voice before now..?
Voice is just like i pull the toilet.. I think the pump suck air somwhere?
And sometimes this voice dosen´t be heard if i drill the pump a long time..
(oil drain pack in sump)?

I just remove the oil sump and oil pick up pipe. Pick up gasket shows it is good contition, and bolts are tight. But i cant be never a 100% sure if it is leaking?
I have got new gasket witch i have to fit, and put some gasket glue in this gasket. (also i paint the sump today)

I just think if the timing cover gasket is broken?

I fit this sump in place tomorrow, because paint is not dry eyt.
And i must to test/prime it again before i remove timing cover.
If the timing cover gasket is ok, then oil pump must be broken?
Or bearings are broken or oil plug is cone somwhere?
But i cant belive the bearing fault?

I just fix a proplem. It is this oil pick up pipe gasket. Thanks folks..

But i have got another proplem now.
Idle hot oil pressure is poor. 7psi@900rpm. And 15-20psi@ 2-2500rpm

And i think old smitch is stay in the pension someday..
I fit a mechanical pressure gauge in the oil light sensor place
and i drill the oil pump. Drill maxium rpm is 2000rpm when free rev.
Smitch shows 7psi when true is 1kg=15psi
Smitch shows 15psi true is 1,5kg=22psi
Smitch shows 30psi true is 3kg=45psi

And i´m not sure is the oil pressure light flaschin 1 time @ idle? Not sure, but i think? Hope not?