We were driving 2000 Dodge Durango down highway and started hearing a light tapping. I noticed the oil pressure gage had dropped completely as I was pulling over. When I came to a stop,the truck dies and will not restart. There was no oil leaking. It had oil in it. But,underneath around where the waterpump area,it lookes like coolant had leaked? Does this sound like a waterpump or a oilpump or both?
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Re: oilpump or waterpump?
Sorry cant help here much ,need truck in front of me to diadnose but it sounds like something has broke ,what i honestly dont know but i suspect a oil pump drive somewhere but never seen one of these trucks here in spain
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OIL PRESSURE IS IN DIRECT CORRELATION TO YOUR BEARINGS,THEIR WORN OUT OR STARVING FOR OIL.YOUR MORE APT TO HEAR A SHARP RAPID SOUNDING TAP THAN A RATTLE. MEANING IT'S IN THE HEAD OR A DEEPER SOUNDING TAP MEANING CONNECTING ROD BEARINGS.PUT A OIL PRESSURE GAUGE ON TO TEST THE PRESSURE TO BE SURE IT'S NOT THE PUMP,IT HAS HAPPENED BEFORE BUT NOT LIKELY THE PROBLEM.
Generally three things can turn the light on. First is the sending unit itself if it's going bad. Next is an obstruction of the pump pickup screen (usually hard carbon deposits). Third is worn engine bearings (usually rod bearings). Best way to find the problem is to have someone put a mechanical pressure gauge on the engine and read the actual pressure. If it's low you need to go into the engine to determine why. if it's normal, replace the sending unit. Senders aren't terribly expensive and you could just buy one and replace the one you have, providing the engine isn't tapping or knocking.
The "check gages" light comes on in response to the oil pressure (not oil level) gage dropping too low. Step one is to check to make sure the engine has oil pressure. Use a mechanical gage inserted directly into the engine when the oil pressure sensor screws in. If the pressure is good, you need to check the gage. Your dealer has a tool that attaches to the connector from the pressure switch that gose to the gage. He can then test the gage, cluster and circuit wiring. If that is ok the culprit is the oil pressure sensor itself. I normally don't recommend replacing parts without a proper diagnosis but an oil pressure switch is relatively inexpensive. You might want to try that first. It's relatively common anf if that's the culprit, you will save a bunch of $$$ no having to go to your dealer. If you still have a problem, you have at least eliminated one item and are only out a couple of bucks.
What engine in your Durango? Most likely you have debris on your oil pan clogging the pickup screen, or a failing pump. Be sure to verify with a mechanical pressure gage that oil pressure is indeed dropping before you take oil pan off.
May be bad oil pressure sending unit. Best way to check is to connect a mechanical oil pressure guage to engine and check pressures when engine is warm. Should be no lower than 40 psi at idle when warm, no higher than 70 psi at 2000 rpm.
with engine running check the oil pressure gauge. if it is not reading you will have to check the pressure with an external gauge. the sensor on a v8 is locaterd rear of the engine next to the distributor. No oil pressure will starve the engine of lubrication and cause damage resulting in the knocking .
When the check gages light comes on just after start up usually one or more gages have momentarily not picked up yet. Dodges are famous for this. If the light stays on for more than 10 seconds and all gages are working t could be a faulty sending unit or you may have to get the computer software reloaded at a dealer
Don't delay on this. Take the vehicle in and have the oil pressure sensor checked. It could be just the sensor or it could be something more serious. A drop in oil pressure could lead to catastrophic engine failure.