Thanks everyone for responding. I'll answer all the questions one at a time.
The block wasn't hot-tanked. I cleaned it out personally, didn't remove any plugs, bushings, or anything like that from the inside of the block, or the outside.
Main crank seals front and back sealed good- no oil leaks.
Main bearings were 10 over, tight, just like we like ‘em. Rod bearings within specs, new cam bushings. Everything tight, tight tight.
I cleaned the oil pump, and made sure the gasket was there and still in good shape. Checked all the clearances, condition of the gears, the clearance between the gears and the housing, the gear lash, etc, etc. The only pressure regulator, like you said, is in the pump, and it’s preset, non-adjustable.
New information: When the oil pump didn’t make any pressure at all, I installed a completely different oil pump, one known to be working. Problem is still there. More on this in a minute.
Oil pressure gauge in known working condition. Just to make sure, I installed a brand new oil pressure tube and a new gauge.
OK, so I am stumped. Here’s what is happening. When I crank the engine, I have good flow through the filter housing. If I run the engine and remove the oil pressure tube, oil shoots up in the air about three feet. I tried putting my finger over the hole, and I couldn’t feel any pressure there at all. The pump should make 50-60 psi- if it was doing that I think I’d have a hard time keeping the oil from squirting out. But I can keep the oil in the motor with my finger, easy.
So, I have a really good flow, but no pressure. Here is my thought process: I have a working oil pump, but somewhere in the block, the oil is short-circuiting the journal system and returning to the pan. The big question is where? I wonder to myself, “How is the oil getting from the pump into the block? Could this junction (between the oil pump outlet and the journal inlet in the block) be the place where the oil is just dumping back into the pan without pressurizing the system? There aren’t any gaskets or o-rings to seal the oil pump into its socket in the block. The outlet of the pump is just below the drive gear- (driven by the cam). What keeps the oil from just running down the outside of the pump and not going into the oil passages?”
I know a guy here in town with a Ford 8N- has the exact same problem. He can’t make oil pressure- replaced the oil pump, etc, etc… so two different old tractors, same problem.
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