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First I would have hooked up a mechanical oil pressure gauge to see if the gauge was bad. Manually turning the pump does not give you how much pressure it can put out. It may have a lot of wear on it. Seeing that the lifters were noisy, you could have a restriction in the oil filter, oil lines or low oil level.
Jeff, you or somebody else will have to hook up a external oil pressure Gage and verify oil pressure OK, before you have a catastrophic engine failure.
1. Engine Noise. With a bad oil pump sufficient engine oil will not get to all parts of the engine, especially the top end, and you will get engine noise with metal parts that would normally be lubricated and quiet knocking due to metal to metal contact. Engines with hydraulic lifters that become noisy can be a sign that they have insufficient oil supply. In addition to the hydraulic lifters, your valve train may begin to make noise if your oil pump begins to fail. Valve train components need to be properly lubricated as well. A bad oil pump can result in a lot of additional noise from your valve train system.
2. Higher engine temperature. Poor lubrication because of poor oil flow generated from the pump will cause friction in the engine and the engine temperature will rise. Good oil flow is essential for lubrication and reducing friction to a minimum.
3. Low oil pressure. The oil pump generates oil flow through the engine but tolerances between metal parts produce the oil pressure. Very worn engine bearings will result in low oil pressure. Thus a worn engine will have low oil pressure even though the oil pump may be fine and there is no issue with the oil pressure relief valve either. However you will also experience low oil pressure due to a failing oil pump because poor oil flow will also result in lower oil pressure.
If your oil pressure warning light has been triggered in your engine, the causes of the low pressure need to be properly investigated because the problem may not be with the oil pump. People replace oil pumps assuming that is always the problem and then still have low oil pressure because the pump was not the problem to begin with.
if your oil no pressure is confirmed by a pressure test /ticking noises dry upper valve train than either clogged or collapsed oil filter --oil pump screen damage /clogged and or failure of oil pump ====if not determined no oil pressure check oil filter change if necessary check and test oil pressure sensor may be faulty or clogged/dirty
Very low or no oil pressure reading does not necessarily mean the oil pump is not working and if you replaced the oil pump because of low oil pressure does not mean the original pump had necessarily failed. It may have but it may not have. Oil pressure is not created by the oil pump but by the resistance to oil flow. If you have very low resistance to flow you will get very low oil pressure no matter how well the oil pump is pumping. If you have a very worn engine, especially the bottom end main bearings and conrod bearings, tolerances increase very significantly, there is little resistance to flow and you will achieve very low oil pressure and metal parts will touch. Oil flow to the upper part of the engine may also suffer. If your engine is gummed up with oil sludge due to too few oil changes some oil passages may be blocked as well.
Clearly the oil pump is capable of pumping when turned by hand, assuming the oil pick up or suction pipe has no defects and the oil pressure relief valve is sealing there should be oil pressure when the engine is started - that there isn't any pressure provokes the initial conclusion the pump isn't being driven by the engine.
I am not familiar with the engine design so I can't comment further.
Engine oil pumps rarely fail. When the oil pressure is low, it's usually due to worn bearings. Other causes are possible, but the oil pump is inside the oil pan on the bottom of the engine. Before deciding that it needs to be replaced, the oil pressure should be checked with a pressure test gauge - not the gauge on the vehicle, because that gauge could be inaccurate. In fact, a defective oil pressure sending unit, gauge or wiring is far more likely than oil pump failure. Be sure the oil level is correct. Compare the reading in psi. to the manufacturers specification. Also consider the oil viscosity. Thin oil gives lower pressure than thicker oil (higher numbers like 40) however, thinner oil flows faster. Use the oil recommended. If the oil pump has really failed, bearings and other engine parts may be damaged. If you really do need to replace it: dodge pick up oil pump
LOW OIL PRESSURE WILL CAUSE OIL PRESSURE SWITCH OR SENDING UNIT TO DISABLE FUEL PUMP.CHECK FOR OIL PRESSURE.REMOVE OIL PRESSURE SENDING UNIT SCREW IN OIL PRESSURE GAUGE TESTER INTO BLOCK WHERE OIL PRESSURE SENDING UNIT GOES TURN ENGINE OVER CHECK FOR OIL PRESSURE SHOULD BE 18 PSI @ 2000 RPM. BESURE TO WRAP TEFLON PLUMBERS TAPE AROUND THREADS TO THE OIL GAUGE PRESSURE TESTER OIL WILL SPRAY EVERY WHERE.IF YOU ARE GETTING NO OIL PRESSURE.YOUR OIL PUMP FAULTY.YOUR ENGINE CRANKSHAFT BEARINGS WORN OUT.WORN DAMAGED CAMSHAFT OIL PUMP DRIVE GEAR OR OIL PUMP DRIVE ROD DAMAGED OR BROKEN. IF OIL PRESSURE OKAY OIL PRESSURE SENDING UNIT IS BAD.
Not really, when the oil is cold it is thicker so the pump is pushing the oil at a greater pressure.
When the oil gets hot, it is LESS thick than when it was cold, so naturally the pump does not have to work as hard to pump the hot oil and the pressure goes down.
You can go to the next thicker oil recomended by the manufacturer for your engine and you should see the oil pressure higher than before.
CHECK THE OIL PUMP SUMP TUBE O-RING. THEY COLLAPSE CAUSING THE OIL PUMP TO PULL AIR INSTEAD OF OIL. TO VERIFY OVER FILL ENGINE OIL AND CHECK ENGINE OIL PRESSURE. THIS IS A COMMON PROBLEM ON ALL NEWER GM V-8 ENGINES : 4.8 5.3 5.7 6.0
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