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mine rattles for a second or so after startup, more if it sits for several days, the rattling stops at the same moment the oil pressure light goes out. There is an o-ring between the oil pickup tube and the pump suction and I plan to replace that to see if things improve. I am thinking to replace the spring and plunger in the oil pump relief valve to see if that improves things, 2nd step is going to be an oil pump replacement. I will post the results of these efforts as I plan to do them one by one
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