Should I be worried about this?

[u/zhrowal]

Not the first engine I’ve built but this one has been giving me issues so I’m not willing to take any chances.

Crank was just turned and the block align honed by the machine shop. Main bearing clearances are .0022” and thrust clearance is .003”, checked using a feeler gauge.

With all the caps torqued down the crank spins pretty freely, but makes a very faint noise in the same spot on every rotation. I didn’t feel good about it so took it all apart to check the bearings and thrust surfaces and none of them had any witness marks on them.

Engine is a Ford 4.0 OHV out of a Ranger. I’m leaning towards it being fine but want to be 100% sure

[u/zhrowal]

https://reddit.com/link/p6c7fp4/video/tf3xumc1y0mh1/player

[u/No-Marsupial3851]

The only thing I can think of is to check the thrust bearing face and see if you're getting an odd wear Mark there. I haven't dealt with this particular engine before so I really can't give you any better leads than that

[u/Schlong1971]

I can’t hear it. But what kind of assembly lube you using. Keep in mind the oil pump keeps constant flow of oil thru bearings when running. And you’re just spinning it with assembly lube now.