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15 years ago in PLYMOUTH
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
Answers (3)
9 years ago
There is also a plug behind the cam plate that I have found missing from home rebuilds.
15 years ago
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.
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