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Loosing oil pressure in my 1968 Plymouth Fury III
I have a 318 cu-in engine which has been giving me an oil pressure problem. I have replaced the oil pressure sending unit and gauge, main and rod bearings and oil pump but nothing has made a difference. When idle, pressure is 0-5 pounds and at 60 mph the pressure is at 20-30 pounds. What could be causing this and can anyone help? Thanks
posted: October 10, 2008
  Answers (3)
Did you have the cam bearings replaced?Did you change the cam and lifters?Both could have a major impact on your oil pressure.
posted:  October 10, 2008
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At the front of the engine, beneath the timing case cover, is a camshaft plate held by four bolts. The two top bolts extend into the main oil gallery. One of these has a hole drilled in its head so oil can feed to the camshaft sprocket. If the heads of these bolts have broken off there would be a sharp reduction in oil flow to the sprocket also resulting in reduced oil pressure. I believe the normal pressure for this engine is 20 lbs. at 500 rpm and 45 to 65 lbs. at 1000 rpm and above. If this is the case and you have to replace the bolts (probably brass), be sure you get the exact same type. Any other size could put a drag on the camshaft sprocket.
posted:  October 13, 2008
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There is also a plug behind the cam plate that I have found missing from home rebuilds.
posted:  February 7, 2015
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