Anji, oil flows to the main bearing and prv via the check ball behind the pump. If the pump is working and actually pumping oil, the gallery behind the pump is either blocked or open to the sump.
Have you tried poking a wire into the delivery port to see if the ball and spring are there? With the ball depressed the gallery to the main bearing should be able to pass fluid.
If the ball, spring and plug are missing, fluid will flow straight to the sump.
Hi Trivinoz
OK, as I understand, oil from the pump goes to the main shell circumferential oil groove via the anti siphon valve, the to the PRV from where it travels at an angle up to the cam shaft well, lubricating the timing gears en route via a small pin hole.
So, if oil isn't reaching the prv, it could be
a) the a/s valve is not lifting to allow oil through, OR
b) there's a blockage in the line. The bush can't turn as it is one piece bronze
c) oil pump not working. It appears to be working as oil is returning to the tank
I have opened up the pump & lapped the 2 end covers. All else in the pump seems fine
Hoping I don't have to open the engine