New Cast Iron Oil Pump pressure low

[Mandy0917]

(12-06-2020 )Waterloo Wrote:  Mandy, what was the pressure when going down the road under a load? And you are running that motor over 1500 rpm's correct? I like to be in the 1600 to 1700 range when dragging a trailer. I have the old style pump, no shim and she is pretty steady at 39 psi. These are low pressure motors, 80 psi seems to be a bit much, I would halve the dimes.

I would also run some gear lube in your oil, Sta-Lube is what many of us use here, or the Walmart brand, in the blue gallon jug, I forget the name, it is the Walmart house brand of gear lube.

Waterloo , I haven’t haul a load yet, just shimmed the pump today, those 1500 rpms were with the truck stopped, I did run it bobtail around the yard but I didn’t like that pressure being that high, I’m opening it again tomorrow to take 5 dimes out of it to see how it goes, I’ll get some pictures and posted them tomorrow, I didn’t knew this new pumps standards, I would have leave the old one there instead, thanks for your advice Sir