Posted by T.R.K. on December 10, 2022 at 18:57:51 from (71.29.15.142):
The Hercules engine is in a Minneapolis Moline BG.
Please don't tell me to ask on the MM forum. All I get from them is Its not a 'real' Minneapolis-Moline.
I am having an oil pressure problem. I rebuilt the engine last winter. reground crank, new main , cam and rod bearings. new sleeves, pistons, even new valve seats and guides. Ok. The problem. When cold it pegs the 80 psi gauge. (Tractor Supply or Napa gauge, by the way.) But when it warms up, the oil pressure drops to near zero at idle. Less than 10. Maybe 5 psi.
I have already installed a shim in the relief valve, and cranked it down about as far as I think I can and it did help some. Before that the gauge would fall all the way to zero.
A couple thoughts: I should have miked the crank or checked the bearing clearance before assembling it. (I may have done this, but almost a year later, I really don't recall.)
I wonder if the machine shop removed any plugs from the oil gallery and I missed them.
I also wonder if there is supposed to be a restriction in the oil line to the governor assembly, the oil line runs external around the block to the governor. I replaced all the external tubing when I rebuilt it.
I wonder the same about the oil filter. Is there supposed to be some restriction in the oil line to the canister. It is mounted beside the air filter.
I also wonder if I just plain have a worn out oil pump.
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