Oil pump

[Jame5on]

clearances seem fine between the two rotors. Once I tighten the screws it will not turn?

Any advice?

 

[Jame5on]

clearances seem fine between the two rotors. Once I tighten the screws it will not turn?

Any advice?

 

[XSLeo]

Hard to tell from this angle but do the rotors stand below flush with the body of the pump. With the rotors down in the pump body place a straight edge across the pump body. I don't recall the exact spec but on my 75 with the straight edge across the rotors setting on the body I could just get a .0015 feeler gauge blade in there. It was very snug. There should be a bit of clearance. If you find you have none, You might try polishing the rotors and body a bit.
With the pump body in hand, rotors and shaft installed, can you spin the rotors? If not per haps there is a burr somewhere on the body or rotors.
Leo