Oil Pump Engine

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Oil Pump Engine
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Chances are, you're already aware your vehicle's engine requires oil to operate smoothly. If the level declines, you'll need to replenish it as soon as possible. Otherwise, you risk allowing your engine to suffer damage due to excess heat and friction. Keeping the level replenished does not guarantee your engine will receive a sufficient amount of fluid. You may be surprised to learn your engine can still seize up if the oil pressure (OP) drops.

In this article, we'll explain some of the reasons the oil pressure in your engine can drop. You'll discover the problem can be related to the rod bearings, the oil pump, pressure release valve, and other components.

Normal Wear Of The Bearings

After tens of thousands of miles, your rod bearings can become severely worn. Normally, there is very little space between these bearings and your crankshaft journals. When the bearings wear down, this space increases. Even a tiny clearance between them and the journals will create a reduction in pressure. The larger the clearance, the greater the pressure loss.

An excessive clearance can lower the pressure by as much as 20%. If that occurs, it will restrict the lubrication provided by the oil to the engine's moving parts. You'll see a warning indicator on your dash alerting you to the problem. If you allow it to persist, you'll likely start to hear knocking sounds. At that point, engine damage may be right around the corner.

The Oil Pump

A lot of people assume their car's oil pump creates the necessary OP to allow seamless lubrication within the engine. In reality, it does not. This component only contributes to the fluid's flow. That said, problems related to the pump can still cause an oil pressure loss.

Your oil pump has gears that are contained within a cover. There is a very small amount of space between the gears and the pump's casing. If the space between them enlarges - even a tiny amount - the pump will be less effective when pumping oil. That reduces the pressure.

The Pressure Release Valve

Your vehicle has a component that is responsible for regulating the OP based on the speed of your engine. This component is called the pressure release valve. It is designed to engage when your engine reaches a predefined speed. The higher your engine's speed, the higher the oil pressure. To control it, the valve opens and allows the fluid to move back to the crankcase. If, for some reason, the pressure release valve is stuck in an open position, the OP will drop.

Is There Air Present In The Pump?

There are times - though it is uncommon - when the oil pan contains too little fluid and as a result, allows air to be pulled into the oil pump. This problem can also occur if there is too much oil within the crankcase. Whatever the root cause, the introduction of air causes a pressure drop.

Is The Oil Filter Clogged?

When oil flows from the pump, it must go through a filter before reaching your engine. That prevents debris from flowing to your engine and causing damage. Over time, the filter can become clogged resulting from an accumulation of debris. Because oil is so critical to the engine, most filters are designed with a separate bypass valve. If debris clogs the filter, the bypass valve engages and opens an alternative path for the unfiltered oil. This sudden opening can result in a drop in the pressure.

If you notice the low pressure warning light on your dash, have a mechanic diagnose and fix the problem as quickly as possible. Without sufficient oil pressure, your engine's moving parts cannot receive the lubrication they need to avoid excess heat. And that can lead to expensive repairs.

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Vw Ps Pump: Key to a Well-oiled Drivetrain

As in any assembly, the individual parts of the Volkswagen power steering (PS) system relies on lubrication in order that they perform as one well-oiled whole. Collectively, the Volkswagen power steering system gives driver a tight rein of the vehicle. Through the steering rack, the driver is able to input the desired direction of the vehicle. When the steering wheel is turned left or right, the rack and pinion gear set turns the front wheels accordingly. To facilitate a smooth drive train operation, the power steering rack of the Volkswagen is fitted with a hydraulic pump that circulates lubricants. From the pump, these hydraulic fluids are charged and injected via the power steering hose. For the hydraulic fluids to reach every individual part of the drive train, they circulate in the system bearing up to 1,300 psi of boost. The Volkswagen power steering pump is typically a vane style pump driven by a belt connected to the engine. It contains a set of retractable vanes that spin inside an oval chamber, streamlining hydraulic fluid injection. The hydraulic fluid reservoir may be mounted on the pump itself for easy fluid flow, or the reservoir may be mounted remotely to isolate the oil from engine heat and maintain its optimal temperature range. The resulting flow of up to specs hydraulic fluid helps reduce steering effort, easing driver fatigue. In order that the hydraulic fluid is injected into the PS system at high pressure, the pump spin the vanes and pull hydraulic fluid from the return line at low pressure and force it into the outlet at high pressure. The amount of flow provided by the pump depends on the car's engine speed. The VW PS pump is designed to provide adequate flow even when the engine is idling. As a result, the PS pump inevitably flows in much more fluid than what is necessary when the engine is running at faster speeds. As failsafe to over lubrication, the VW PS pump contains a pressure relief valve to make sure that the pressure does not get too high, especially at high engine speeds when so much fluid is being pumped. A PS system is designed to give assist to driver only when force is exerted on the steering wheel. The component of the VW PS system that senses the force on the steering wheel is called the rotary valve. The key to the rotary valve is a torsion bar, a thin rod of metal that twists when torque is applied to it. The top portion of the bar on a typical VW PS system is connected to the steering wheel, and the bottom of the bar is connected to the pinion gear set that turns the wheels, so that the amount of torque in the torsion bar is equal to the amount of torque the driver is using to turn the wheels. The more torque the driver uses to turn the wheels, the more the bar twists. Some Volkswagen models use variable assist power steering systems, which provide more assist at low speeds and reduces assist at higher speeds. This provides the most assist when needed, reduces over-steer in emergency situations and provides better on-highway feel.

About the Author

John Garret is an automobile mechanic who knows every crook and cranny of his truck. He's also a vintage car enthusiast, and he's dedicated to fixing and restoring them. He is a motorist who believes in continuous research and improvement.

CALLING ALL MECHANICS!! Can anyone explain how an oil pump on a car engine works?

I know that in an 4 stroke engine there is a pump the forces the gas into the cylinder and pistons. How does it work?
sorry, I meant to say FUEL PUMP, because I know oil is basically just used as a lubricant for a car engine.
But, once again,
How Does A FUEL Pump Work???????

PLEASE HELP!!!!

Basicaly,there are 3 types,Theres an electronic fuel pump,a mechanical fuel pump and a vaccum pump.....The electronic one is basicaly what it sounds like,it runs off 12 volt power to suck the fuel out of the tank.Some are in the tank and some are inline on the underbody.They suck the fuel outa the tank and push it through the lines to the injecters where it is injectected via electronic control by computer.....The other way is mechanically driven,which is run off a smaller cam inside the moter.The cam has a lobe on it which hits up against an arm on the pump which acts as a sort of plunger inside the housing to create the suction needed to to get the fuel from the tank to the injecters or carby....The other is the old vaccum trick.ONLY on older cars,20's style,lawnmowers,whipper snippers and small scale rc cars will have this...Basicaly it uses the pressure from the exhaust or crank case pressure to pressurise the fuel tank to force the fuel into the carby.

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