Oil pump Farmall H, IH 300 and IH 350.

[Mtjohnso]

Just rebuilt the engine in my IH 350
New Sleeves, cam Bearings, cam cleaned up, main bearings, rod bearings m, pistons and new rings.
Did not turn crank but did mic it. Looked good.
In the rebuild process pulled oil pump apart and there was excess wear on the shaft that drives oil pump. Built up shaft with weld and turned it down on lathe.
Finally got everything back together and started engine. However only had 15 pounds of oil pressure that’s with engine warmed up. New oil gauge.
Using 10w-30w oil.
Could be gauge
Could be pump
How would you troubleshoot problem?

 

[Mtjohnso]

Are oil
Pumps on H, 300 and 350 the same?
Way to test oil pump on the bench?

 

[Farmall M 248]

Better to be safe than sorry ,and just pull the pan and check it because 15psi is not sufficient oil pressure to lube the Cristal points.

 

[Farmall M 248]

Critical

 

[used red MN]

Critical

There is an “Edit feature” lower left on a PC. Same on a phone but the 3 dots to the right of report let you access it.

 

[used red MN]

Just rebuilt the engine in my IH 350
New Sleeves, cam Bearings, cam cleaned up, main bearings, rod bearings m, pistons and new rings.
Did not turn crank but did mic it. Looked good.
In the rebuild process pulled oil pump apart and there was excess wear on the shaft that drives oil pump. Built up shaft with weld and turned it down on lathe.
Finally got everything back together and started engine. However only had 15 pounds of oil pressure that’s with engine warmed up. New oil gauge.
Using 10w-30w oil.
Could be gauge
Could be pump
How would you troubleshoot problem?

Was it a runner before the overhaul? If so what was the oil pressure like then? Did you plastigauge the bearings during assembly, at least one rod and one main? This is good insurance for someone who doesn’t handle micrometers and snap mics every day. If it’s bad you might be stuck with a set of main bearings that have been installed or 1 rod bearing. At least you’re not scratching your head wondering if that’s the cause of your low oil pressure.
Also sounds like you had the engine out if you put cam bearings in it. Taking a crank to a machine shop for them to measure and assess it is also another level of insurance.

 

[560Dennis]

What’s the clearance gears ,to base , thickness of gasket.? Gaskets from non oem mfg. are .005 to thick or more cause loss of pressure.
What the flatness of bottom plate ,was it resurfaced.
Manuals have corrected action for oil pumps to follow
Was the pressure release spring change . 70 year old spring pretty tired.
Some things I was thinking to check .

 

[MeanGene1]

I do a lot of performance car engine stuff, specializing in 427 (FE) Fords. We can manipulate pressures and flows with clearance and pump volumes, and with high RPM, larger clearances can be better- general rule, less clearance, lighter oil, big clearance, heavier oil. In that world, high volume oil pumps are available and common. In the case of the 427, folks started making oil pump covers that were a recessed casting, which allowed the use of the rotors from the 534 Super Duty truck engine, with much increased volume- nowadays you can buy a new "high volume" pump that is made that way. If your clearances are a little on the loose side, more volume can help with the "controlled leak" as we call it, and show more pressure on the guage. I'm wondering if there is a a similar collection of parts (or a pump from a larger engine that can be adapted) that would help this problem- not the absolutely correct way to do it, compared to starting over and carefully setting the clearances, but it works- key screaming from the old guard/ purists lol. We are running a Pro Modified pulling truck with a 672 c.i. 460 with a 5" stroke crank that has .004- .0045 clearances (on purpose). 16 quart pan, big oil pump, runs all season on one set of bearings and they come out looking good. Barks pretty good too, estimated around 1300 hp on methanol