 Last week my model 50 started showing abnormally high oil pressure. I checked the level and it was normal. Oil looked good. Usually the oil pressure sits a little below "High" but now it was sitting a little over "High". The engine was warmed up so it was not a cold oil sort of thing. I adjusted the oil pressure regulator and found that while I could adjust the pressure, it did not adjust smoothly. Seemed to want to jump from too low to too high. Eventually I settled on the area where I wanted it. A few days later when I started the engine, the oil pressure jumped off scale. I ran the engine at low speed till it warmed up and eventually it came down to the "High" mark. I suspect I've got a problem with the oil pressure regulator. Traditionally this engine shows very steady good oil pressure regardless of engine speed or temperature. Now it's all over the place. I've included a section of the parts manual. What are the likely suspects? I suspect part #20 as being broken. What sort of material is the bushing (#18) made of? If its rubber I guess it could have cracked and come loose. I noticed that there is also a bypass (relief) valve for cases where the oil filter is clogged (parts 5 & 6) but I don't think I've got a filter problem. Anybody had this happed to them? Thanks!
John
1953 Model 50
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