(Disclaimer: I am familiar mostly with Fords)
Bought a 40,000 mile, used 350 CFI for a '92 Silverado PU.
Removed the intake, heads and pan and the engine really looked clean. Reassembled it and primed the pump with a drill - 40 psi and oil to the top of the rockers - installed it and fired it up after installation.
Road test: Very bad oil pressure once warmed up - (w/ wet guage) less than 5 psi hot idle in gear, 10-15 psi cruise, 20 psi when accelerated. I used 10w-40 Castrol GTX. Hot ide in gear produces an intermittant but noticeable bottom end knock - I suspect a main bearing - same for 2-3 seconds on initial start up. (No noises under load which is strange to me if it's a main bearing - but then again, this is when it shows 20 psi oil pressure)
My question: Is there something I'm missing here or is that simply a sign of large clearances? Would you recommend pulling the pan and checking the clearances - it's a 4x4 and looks like a pretty good task if it's even possible without pulling the engine.
Thanks.
Bought a 40,000 mile, used 350 CFI for a '92 Silverado PU.
Removed the intake, heads and pan and the engine really looked clean. Reassembled it and primed the pump with a drill - 40 psi and oil to the top of the rockers - installed it and fired it up after installation.
Road test: Very bad oil pressure once warmed up - (w/ wet guage) less than 5 psi hot idle in gear, 10-15 psi cruise, 20 psi when accelerated. I used 10w-40 Castrol GTX. Hot ide in gear produces an intermittant but noticeable bottom end knock - I suspect a main bearing - same for 2-3 seconds on initial start up. (No noises under load which is strange to me if it's a main bearing - but then again, this is when it shows 20 psi oil pressure)
My question: Is there something I'm missing here or is that simply a sign of large clearances? Would you recommend pulling the pan and checking the clearances - it's a 4x4 and looks like a pretty good task if it's even possible without pulling the engine.
Thanks.