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<h2>What is an oil pump in a car?</h2>
An engine oil pump is a mechanical device that pumps oil through the engine to provide lubrication and cooling to its moving parts. It is typically located inside the oil pan and is driven by the engine's crankshaft via a chain or gear system. The pump's main function is to draw oil from the oil pan and circulate it through the engine's oil passages, bearings, and other components. The oil pump also filters the oil, removing contaminants and debris that could damage the engine. The proper operation of the oil pump is critical to the performance and lifespan of the engine, and any problems with the pump can lead to engine damage or failure.
<h2>Engine oil pump types</h2>
There are two main types of car engine oil pumps:
Gear pumps: Gear pumps are the most common type of oil pump used in automotive engines. They use a pair of interlocking gears to pump oil from the oil pan through the engine's oil passages. As the gears rotate, they create suction that draws oil in through the pump's inlet and then forces it out through the outlet. Gear pumps are relatively simple and efficient, but they can be noisy and may not provide consistent oil pressure at high RPMs.
Rotor pumps: This type of engine oil pump uses a set of rotors with lobes or teeth that mesh together to pump oil through the engine. As the rotors turn, they create chambers that draw in and compress the oil, forcing it out through an outlet. Rotor pumps are typically quieter and more efficient than gear pumps, and they can provide more consistent oil pressure at high RPMs. However, they are more complex and may be more expensive to manufacture.
<h2>How to replace an engine oil pump?</h2>
To replace an engine oil pump, the first step is to prepare the vehicle by ensuring it is on a flat surface and the engine is cool. It is also important to have all the necessary tools and replacement parts. The next step is to drain the engine oil and remove the oil pan, being careful not to damage the gasket, which may need to be replaced. Once the oil pan is removed, the oil pump can be located and removed by undoing the mounting bolts holding it in place. Be careful not to damage any of the engine components during this step.
After removing the old oil pump, the new one is ready to be installed in the same location, and the mounting bolts can be tightened to the specified torque. It is also important for you to follow any instructions during this step. Once the new oil pump is installed, the oil pan can be reinstalled, and the mounting bolts can be tightened to the specified torque using a torque wrench. The engine can then be refilled with the recommended amount and type of oil, and the oil filter can be replaced. After all steps are completed, the engine can be started.

Oil Pump

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Air Filter Box

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Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Throttle Position Sensor

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Turbocharger

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

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Oil Filter

Oil Filter Base

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Glow Plug Relay Module

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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Ignition Distributor

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Ignition Starter Switch

Ignition Switch Actuator

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Hose

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Engine Mounts

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Catalytic Converter

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EGR Valve

Emissions Fluid Pump

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Filter

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Fuel Injection Control Module

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Fuel Injection Pressure Regulator

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Fuel Injector

Fuel Injector Kit

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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Fuel Tank Filler Neck Pipe

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Fuel Tank Strap

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High Pressure Fuel Pump

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Idle Air Control Valve

Mechanical Fuel Pump

Oil Pressure Relief Valve

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

2005 Mercury Mountaineer Oil Pump