Symptoms and repair methods for a faulty car oil pump
The symptoms of a damaged car oil pump mainly include the activation of the oil pressure warning light, abnormal engine noise, difficulty in starting, power loss, and overheating of the engine. Repair requires professional inspection followed by replacement of the damaged components. Here is a detailed explanation:
Common symptoms of a damaged oil pump
A faulty oil pump can cause insufficient engine lubrication, resulting in the following typical manifestations:
The oil pressure warning light comes on: The red oil tank icon on the dashboard remains illuminated, indicating low oil pressure (normal idle pressure is 20-60 psi), which may be caused by pump wear or blockage.
Abnormal engine noise: Metal knocking sounds (such as "clattering") occur during cold start or high speed, due to insufficient lubrication, causing increased friction of components.
Difficulty starting or power loss: Extended ignition time, weak acceleration or jerking, due to the inability of the oil to effectively pump to key components (such as pistons, crankshaft).
Engine overheating: Ineffective oil circulation leads to heat failure in cooling, with abnormal temperature rise, and in severe cases, it may "boil over".
Other warning signals: Rapid oil consumption (no leakage points), blue smoke in the exhaust (oil burning) or engine fault light on.
Repair methods and steps
Oil pump repair requires professional equipment and cannot be handled by oneself:
Diagnostic testing: Use an OBD diagnostic tool to read fault codes to determine if they are related to the oil pump.
Measure the oil pressure (below 20 psi requires vigilance) and check the oil quality (cloudy or foamy indicates abnormal circulation).
Replace components: If the pump body is confirmed to be damaged (such as internal wear or cracks), the original factory oil pump assembly needs to be replaced.
Replace the oil and filter at the same time to avoid residue of impurities.
Further recommendations:
Stop immediately: If the warning light is on, continuing to drive may cause engine cylinder seizure.
Choose a reputable repair center: 4S stores or professional institutions can ensure the accuracy of the inspection (such as fuel pressure testing).
The function of the oil pump in the lubrication system: The oil pump's function is to raise the oil to a certain pressure and force it to be delivered to the moving surfaces of each part of the engine. The oil pump's structure can be divided into two types: gear type and rotor type. The gear type oil pump is further divided into internal connecting gear type and external connecting gear type. Generally, the latter is called a gear-type oil pump.
This component is used to increase oil pressure and ensure a certain amount of oil supply, forcing oil to be supplied to each friction surface. Internal combustion engines widely use gear-type and rotor-type oil pumps. The gear-type oil pump has a simple structure, convenient processing, reliable operation, long service life, high pump oil pressure, and is widely used. The rotor pump has a complex shape and is mostly pressed using powder metallurgy. This pump has the same advantages as a gear pump, but it is compact, small in volume, and has the same advantages.
The characteristics of the gear-type oil pump are reliable operation, simple structure, convenient manufacturing, high pump oil pressure, and wide adoption.
When the engine is operating, the drive gear on the camshaft drives the transmission gear of the oil pump, causing the active gear fixed on the driving gear shaft to rotate, thereby driving the from the driving gear to rotate in the opposite direction, sending the oil from the intake chamber along the tooth gap and the pump wall to the outlet chamber. Thus, a low pressure is formed at the intake chamber, generating suction, and drawing the oil from the oil pan into the chamber. Due to the continuous rotation of the main and from gears, the oil is continuously pumped to the required parts.
Application scenarios
The oil pump is increasingly used in internal combustion engines. At the same time, it also plays a certain role in semiconductor, solar energy, LCD and other engineering fields. With the development of processing technology, the oil pump for automobiles - the cycloidal rotor pump has been applied to sewing machines, especially for some fully enclosed automatic lubrication systems, such as seamers and tensioning machines.
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