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The oil pump delivers a fixed quantity of pressurized oil to the engine to keep it running smoothly. Without the right amount of oil pressure, critical engine parts can begin to make contact, causing extensive and expensive damage.
These are some of the common symptoms associated with a failing oil pump:
A worn or failing pump will cause a loss of oil pressure. When this happens, internal engine components, such as bearings, camshafts and crankshafts, are starved of pressurized oil. When this happens, the engine will quickly get damaged.
The engine's computer monitors oil pressure. If the module senses that it's too low, it will turn on the oil pressure warning light. On most cars, it will turn on the check engine light as well.
Loss of oil pressure can prevent a vehicle from starting. On some cars, fuel delivery to the engine is cut when the oil pressure drops below a certain point.
When certain engine parts don't get enough oil, the engine may start to make tapping, knocking or rattling noises.
An oil pump failure can result in engine failure. Get it diagnosed by a professional, find a shop in your area
The oil pump doesn't actually create pressure on its own. Instead, the pressure is created as oil move through tight passages inside the engine.
An oil pressure relief valve located at the outlet of the pump opens to keep the pressure from getting too high. The desired value is typically between 10 and 80 PSI, depending on your engine's design, speed and temperature.
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Most vehicles use one of two basic pump designs
Gear: This type of pump has two gears on the inside. Oil is pulled into the pump through the inlet, then flows around the outside diameter of each gear and exits through the outlet.
Rotor: This type of pump contains an inner rotor and an outer rotor. As the lobes of the two rotors come in and out of mesh, oil is pulled in through the pump inlet and forced out through the outlet.
In the past, the oil pump was mounted to the bottom of the engine, inside the oil pan. It was usually driven off a shaft connected to the camshaft or distributor. But on most modern vehicles, the pump is found in the front cover and is turned by the crankshaft.
Regardless of which design is used, oil is pulled into the pump from the oil pan. The fluid first passes through a screen to remove debris, then travels through a tube to the pump.
If you suspect a bad oil pump or loss of oil pressure, stop driving your car immediately. Have it towed to a repair facility and assessed by a professional mechanic.
It may be possible to get away with just replacing the pump. But, in many cases, when the pump fails, it starves the engine of oil pressure and causes internal damage. In this case, the entire engine will need to either be rebuilt or replaced.
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I'm starting to think my oil pump needs to be replaced. Oil pressure is fine when engine is running, that is not the issue. The problem comes when I change the oil. It's becoming increasingly more difficult to get oil pressure to build after an oil change. Bottom end of the engine was rebuilt at 72,000 miles, top end was rebuilt around 86,000 miles. The car has about 116,000 miles on it now. Runs great, 165+ compression in each cylinder, 60+ psi oil pressure when hot, 30 pounds pressure at 600 rpm idle when hot. The last two times I've change the oil and filter, it's taken me a half hour to get pressure to build back up. I pulled the spark plugs and the coil wire and crank the engine for 10 second intervals, pausing 20 seconds to let the starter rest. The last time I changed the oil, I almost ran the battery down from cranking before I finally got a oil pressure. Yesterday, after cranking on it for a half hour, I took the oil filter off and filled it with oil first before putting it on and also put oil in the tube that sticks up where the oil filter screws on. I don't know if this is something people normally do or not, as I normally haven't done that in the past. That did seem to help, although it still took several rounds of cranking and resting before I finally got oil pressure. Could this be a sign that the oil pump needs to be replaced?
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