. However there was a rubber or neoprene "skirt" that goes around the oil filter casing inside the oil pan. It no longer fits as it should will the system work right without it-Try replacing it and see what happens
Causes of Low Oil Pressure
Possible causes include:
Excessive main and rod bearing clearances (someone may have installed the wrong-sized bearings or standard-sized bearings on a reground crankshaft). Only 0.001" of extra clearance in the main bearings can reduce oil pressure by up to 20%!
Excessive camshaft bearing clearances (a bearing may have slipped out of place when the cam was installed).
Excessive clearances inside the oil pump.
Leaks between the oil pump and engine.
Oil pump relief valve stuck open or installed backward.
A loose or mispositioned oil pickup tube (too high in the oil pan).
A defective oil pressure sending unit or oil pressure gauge.
Low oil level in the oil pan.
Cracks or leaks in the oil galleries or gallery plugs.
Cracked oil pump housing (improper installation).
Oil viscosity too thin for hot weather.
Oil viscosity too thick for cold weather.
Sunday, March 1st, 2009 AT 3:54 PM