6.2 diesel problem

I have a 6.2 diesel i rebuilt in school. When it is running it will make a poping sound out of the intake port of clyinder #5. I had the heavy duty rockers on it then i swiched to the standard rockers and it still pops. also It wont show hardly any oil pressure. I've had three differnt sending units on it and it still doesnt. I put a brand new one on the today and it shows just a little pressure. It has a new oil pump and we have manualy turned the pump and it pumps oil. I need to figure out what is wrong.


thanks
bud

Put a known good mechanical pressure gauge on the oil system to see what the oil pressure is. If it's low, it's either too much bearing clearance, a stuck relief valve or a wimpy oil pump.

Is the #5 intake valve sealing properly?

ok thanks for the input on the oil problem.

yes we broke down and took the head off and found out that it wasnt sealing right.

thanks
bud