MikeV Posted April 13, 2018 Report Share Posted April 13, 2018 I have a 1952 Dodge 1/2 P/U with a 251 Cu flathead engine. I don’t have a oil filter on the engine. I have been told that the oil pressure relief valve only works if you have the optional oil filter attached to the engine. Is that true? I don’t know how the oil pressure relief valve works on these flathead engines. Could anyone explain how it functions? thanks! Mike Quote Link to comment Share on other sites More sharing options...
matt167 Posted April 14, 2018 Report Share Posted April 14, 2018 the oil filter simply dumps into the bypass after the relief valve. Essentially the same place that the relief valve dumps to. Even without a filter, still will regulate pressure. Quote Link to comment Share on other sites More sharing options...
MikeV Posted April 14, 2018 Author Report Share Posted April 14, 2018 Thanks Matt! the oil pressure relief valve came as part of the engine and was designed to control the oil pressure in the block whether you have a oil filter on the engine or not. That’s the way I see it, but I could be wrong. I just don’t know enough about the oil pressure plumbing in this engine. i removed the spring from the valve on the block and inspected it. The spring seemed to be easy to compress and weak, so I plan to replace it. it might even be the original spring! Can you control the engine oil pressure by changing springs? , I would think so, but there agin, I don’t know. thanks for your comments! mike Quote Link to comment Share on other sites More sharing options...
dpollo Posted April 14, 2018 Report Share Posted April 14, 2018 The by pass filter works in conjunction with the oil pressure relief valve. You do not need a filter but the engine needs the relief valve or oil pressure will become excessive ( at least in an engine which is not worn out ) There is a very good Chrysler technical manual featuring " Tech" from about 1950 explaining the difference between engine oiling systems and is especially helpful in understanding the finer points of the Full Flow Filter system as used on the Chrysler six. Quote Link to comment Share on other sites More sharing options...
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