Oil pump replacement

Adam/Mill Valley CA

Adam/Mill Valley CA

Senior Member
I have the oil pan off my '36 pickup, a 221ci babitt-bearing engine. It has the very old style long body oil pump, the kind with a filter screen inside the body of the pump (missing on mine), no relief valve on the pump, and a long pickup that drops into a small circular reservoir on the bottom of the pan. The drive gears are helical-cut. It has some wear, and I'd like to replace this with a new #50 (short body)pump. Alll of the ones that I see from the usual suspects have a relief valve built into the pump body. My relief valve is at the front of the intake valley; I checked it when I had the intake manifold off, replaced the spring, cleaned it, etc.
Do I keep both relief valves? Plug the one on the new pump?
Also, the pickup on the new pump has a screen built in, it looks like it would interfere with the little reservoir at the bottom of the pan; do I just cut that off?
Thanks for any guidance,
Adam
 
Adam,

There was a lot written about this a couple of months ago. There was agreement that the lower PSI valve in the engine had to be changed to keep it from letting the pressure release too soon. The spring on it was originally set for the lower pressure system. Some of the Barners wrote about stretching the valve spring to increase the point at which it would release pressure. Others said to block the valve by removing the spring in the block and inserting a plug. This would allow the new release valve in the pump to control everything. One wrote about drilling the large brass cover plug (in the engine) to receive a bolt that could be adjusted down from above to push the bottom release valve completely closed. He said that the flat spot on the valve base would still allow some oil to go into the timing cover area for the gears. Hope this helps.
 
Kent, is that just for the high pressure pump (80#) or also for the 50# pump(which is the one that I would use)?-I thought the nominal opening pressure for the relief valve in the engine block was also 50#
 
I leave both relief valves in place, no harm done... I am one that believes in moderate, not high oil pressure is a good thing... Karl
 
Thanks,Karl-it's a very low stress, stock motor so I don't see the need for high oil pressure. The spring in the relief valve in the engine block is the one you were kind enough to give me

Adam
 
Adam,
i have a short pump in my new motor,a 35 motor. the baffle and the round reservoir was cut out, and the new stile pickup used. also i run both relief valves. i have about 17 lb at idle and 55 lb at 40 mph.
Brendan
 
Somewhere I saw a Ford manual that stated to replace the spring in the block relief valve with the same spring for the later oil pump. It listed a part number for the spring. In my case I just found a spring with a little heavier wire to use in the block relief; figuring that the valve in the new pump would provide the pressure regulation and the block relief would serve as a back-up.
 
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