no oil pressure after engine rebuilt

[ACQ]

I have rebuilt 3b engine with 7a head. At first start engine ran without any scary noises, but no oil pressure in the block (in oil pressure sender place) - 0bar (mechanic gauge also)! Oil pressure is good in the turbo inlet. What could be the problem?

Oil thermostat open a bore only to the oil radiator? could it close a bore to the block if it was installed wrong? I don't know what is wrong and I really won't to disassemble an engine again..

[Pirvu Eugen]

your oil check valve is stuck or damaged! look here post 19.

http://www.s2forum.com/forum/showthread.php?t=72996&highlight=arp+mains+torque&page=2

Goodluck!

[ACQ]

Thanks. I hope that it is the problem

[ACQ]

Could I start the engine without this oil check valve? . Main was demaged

[Pirvu Eugen]

Yes, you can.
But check iff the engine is ok than replace as you will loose oil from the head during startup.
Hope the engine is ok.
Regards!

[ACQ]

I hope so. i will try to start engine without this valveand look at pressure

[Pirvu Eugen]

Goodluck!
Post result please!

[ACQ]

4.5bar on cold. I think it is too low...

[Pirvu Eugen]

Is ok...maibe the oil pressure relief valve is set a little low. no rattles?
No noises? Check with engine warm.

[AndyP]

Sounds a little low for a cold start, what oil are you using?

That valve must have an affect on oil pressure, I'd get a new one ASAP

[piotr]

i would expect to see good 5 BAR on cold start

[AndyP]

The gauge should be maxed, I'm sure it goes to around 6bar cold.

[ACQ]

I use stack mechanic gauge. I won't warp up it long because I am not connected water. I just keep 1.30min engine running and it sounds without any noises and oil pressure showed 4bar at 1000rpm in the and. It is really low I think. Does the oil pressure valve increase a pressure?

[AndyP]

Does the oil pressure valve increase a pressure?

I don't know for certain, but I'm pretty sure it will

[Pirvu Eugen]

The pressure sensors are after the valve into the head path. I am pretty sure that the valve will not increase the oil pressure reading from those 2 sensors.
I think you should fit the water radiators and run the engine till normal running temps and check then.
What oil you use?