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Yes it was where it was supposed to be and then i lost pressure so i overfilled to see if the pump would pick it up and it's where its filled to.Yes it was where it was supposed to be and then i lost pressure so i overfilled to see if the pump would pick it up and it's where its filled to.
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Pull the sump and check the main bearings for spinning in cap. The knock indicates a bearing and the fluctuating pressure indicates a oil hole being opened and closed as the bearing shell moves over the oil hole in the crank.
Knocking in engine and low oil pressure usually means bad main bearings. May have been caused by bad oil pump or just worn out bearings due to high mileage. If this is problem needs engine or rebuild old engine.
oil pump gears inside the lower engine, or electrical. 1st make sure its full on oil, then sheck it with another pressure guage to confirm its not actuall pressure.
Does the oil light come on or the knock occur during the engine warm up after a cold start?
There could be a couple of problems causing the issue. You could have an oil pressure pump or pump pressure regulator sticking. I would have a mechanical oil pressure gauge installed and verify oil pressure at idle and 2500 rpms to make sure oil pressure is in normal ranges.
You could also have excessive piston rod bearing, crankshaft bearing or cam shaft bearing wear that will cause oil pressure to drop too low to prevent the rod knock your hearing at 2500 rpm.
You said a knock and not a ticking noise,so I don't believe a lifter is the issue at 2500 rpm.
Start with the oil pressure check and go from there.
Let me know.
Regards,
If you don't hear any ticking or knocking while the pressure gauge drops, the problem is probably a failing "oil pressure sensor". If you do hear a ticking or knocking, the problem is probably a failing "oil pump".
Is the oil level where it should be on the dipstick?
Yes it was where it was supposed to be and then i lost pressure so i overfilled to see if the pump would pick it up and it's where its filled to.
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