low oil pressure

nickm · Post by **nickm** » Mon Nov 12, 2007 1:45 pm

I have just rebuilt my 3.9 pre serp engine with new bearings,oil pump,stage 3 heads,piper 270 cam etc.It was rebored 20 thou and the crank was measured up and found to be within tolerance.When I fired it up it was showing 50psi with aboout 2000 rpm but after 5 mins running it now shows about10psi.Any ideas?

ian.stewart · Post by **ian.stewart** » Mon Nov 12, 2007 2:25 pm

What oil are you running??

nickm · Post by **nickm** » Mon Nov 12, 2007 2:28 pm

halfords 20/50

Post by **katanaman** » Mon Nov 12, 2007 4:59 pm

with the engine stopped tap the oil relief valve and see if that does anything.

Post by **Coops** » Mon Nov 12, 2007 6:48 pm

i had a similar thing with my engine last year,
turned out to be a sticking relief valve like marki has posted above,
we tried alsorts to correct it with no joy, in the end i bought a tadpole valve to replace the factory one.