Oil pump for 12 cylinder engine not holding pressure

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Hi, We own a 1934 Pierce-Arrow 5 passenger club sedan with the 12 cylinder engine.  Is there a service bulletin on the oil pump. No oil pressure.  Any information would be greatly appreciated.

Thanks,

Glenn Wengerd

Winesburg, Ohio 44690

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You can find information doing a keyword search on the PAS service bulliten directory. Meanwhile, I have had two issues with zero oil pressure, one is the floto screen (the oil pump inlet screen) plugged with junk, or the oil pressure regulator valve piston stuck. The former was from accumulated junk, the second (brand X) a rebuilt oil pump with a burr left in the regulator sleeve. Could possibly be the oil pressure relief spring broken from corrosion. These entail dropping the pan to inspect.

You could verify that the gauge isn’t the issue first. Unscrew the line from the engine oil port going to the gauge and pressurize the gauge with an air compressor and regulator. I would set the regulator for no more than 40 psi to avoid damaging the gauge.

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