Well, about a month after I changed my oil, my oil pressure gauge started going a bit higher than it usually was. Then a few days later, it would drip down almost to the last notch in the gauge when running highway speeds. I read in the Haynes manual that it might be the oil pump.
Pulled the starter, removed the oil pan, removed the oil pump, and found a huge amount of little black, "Rocks," in the strainer. Cleaned them all out and flushed the strainer in some fresh oil, replaced everything, removed the center distributer wire and cranked the engine about a minute to prime the pump. Placed the wire back into the center and it starts and runs fine (although at this point, I'm only letting it idle in my driveway while checking for leaks).
HOWEVER, there's a bit of water dripping from the exhaust. Could that just be condensation, or a cracked water jacket in the engine?
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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
It is better to have a Higher Oil Pressure.. When shut off it reading 40 is just the gauge I would think. On my 78 Chevy the gauge will not zero out untill the next day when I go to start it and turn the key over. You might try running some Fuel stabilizer through it, Possibly a better Grade gas.. As the oil goes, If you are loosing oil I advise checking it Weekly, and add oil as needed.. to maintain the proper running level.. Change every 5000 miles or so as normal, Also Change filter each time you change the oil. I hope this helps a little. Good luck!
Kelea, if you do not hear a lot of engine rattling noises then I would say your "Oil Pump" is OK and you need to replace the "OIL SENDING UNIT" which you can buy at Autozone. CAUTION: If you do hear a lot of rattling noises coming from your engine then I'd suggest having someone check the oil pressure. If the oil pressure is low then it could be all kinds of things that can cause low pressures. From engine bearings, to restrictions, to the oil pump itself. I would start with the oil sending unit first and see what your oil pressure looks like. If your oil pressure is good after replacing the sending unit then I'd consider never taking my vehicle back to the shop that told you it was the pump. Hope this helps and have awesome day.
If your oil pressure is good, let's look beyond the oil pump. I'd like to tell you how to turn off the pesky light, but that's beyond my skill. In the long run, you may choose to put black tape over it. It could be the sending unit, yes. They aren't too expensive. If that doesn't work, I'd consider an oil pressure gauge!. You didn't say what year or model you have. Could you handle an oil pressure gauge mounted under the dashboard? Loose or worn bearings , if not noisy now, will very often fail very quickly, sometimes before you can even reach the ignition key to turn it off! Be blessed.
Heavier oil will increase the oil pressure. keep your eye on the gauge for the next few days & take notice of any change. If so have it checked out. Hopefully it will stay where its at for now. At 1200 miles the pressure should decrease some after the oil impurities are broke down
Here's a few things to check out. First, you need to know if the oil pressure is correct or not. You can figure this out by removing the sensor and replacing it with a manual oil pressure gauge for testing purposes. If you find that the manual gauge is showing higher pressures, you can breathe easy and start looking at your instrument cluster for the problem. If, however, your oil pressure is reading the same, you need to figure out why your oil pressure is so low. One thing to check out, is to change out your filter, especially if it's a brand other than GM's AC Delco. Some filters are TOO restrictive, and can cause low oil pressure issues. Secondly, the viscosity of oil that you use can make a difference as well. As engines get older, and acquire higher mileages, they wear down a little. This makes larger gaps for oil to pass through, thus allowing your oil pressure to lower. For higher mileage vehicles, it's recommended to go with a slightly thicker oil, which will combat this problem. If these don't bring your pressure up enough, you may have to consider replacing your oil pump. This is more involved, as you must take the pan off the engine, and that can be a pain sometimes. You may opt for a higher volume pump, which would compensate for your increased tolerances. Hope this helped you out!
this one is difficult to diagnose without putting a oil pressure gauge on the engine to check oil pressure ,hopefully ??its just the switch but ??? ...If oil pressure is low then change the oil and filter and put in a can of STP oil treatment and trade it in quick
Low oil pressure is generally caused by internal engine bearing wear, not a "bad" oil pump... Pumps become "bad" when debris from a failed component gets into it, causing damage. (exception being pressure regulator spring/plunger assembly becoming clogged with gunk in engines that do not get proper maintenance; likely not your case) Were there any tapping noises coming from engine when pressure was low? If not, The most common problem is the pressure sending unit, sending bad info to the warning light. If passage going to it or internal passage is gunked up, this problem usually disappears when oil is changed. sometimes the sender just goes bad, in which case, change it. To get a proper diagnosis on your problem, have someone put a mechanical oil pressure gauge on it. This will read the actual oil pressure and will tell you a lot about the condition of your engine! I have never seen a valve job that corrected any oil pressure problem. I mistrust anyone who would even think that!!! Mlinimum low pressure at idle is 15 psi Max is about 60psi running (higher can explode an oil filter) A reading of 15psi indicates the beginning of a problem. although considered "safe" it is not good.