What are the symptoms of a faulty oil check valve?
2 Answers
The symptoms of a faulty oil check valve include extremely unstable idling or even stalling, flashing warning lights, failure to meet annual emission inspection standards, oil burning, and blue smoke from the exhaust. Below is relevant information about engine oil: 1. Introduction: Engine oil, also known as engine lubricant, has a density of approximately 0.91×10³ (kg/m³). It serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. It is often referred to as the "blood" of the car. Engine oil consists of base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, while additives compensate for and improve any shortcomings in the base oil's performance, providing new characteristics and making it an essential part of the lubricant. 2. Classification: Engine oils on the market can be broadly divided into mineral oils and synthetic oils based on their base oil (vegetable oils are not considered due to their scarcity). Synthetic oils are further categorized into full synthetic and semi-synthetic.
I've seen this issue several times. The most obvious symptom of a faulty oil check valve is difficulty during cold starts. Because the valve doesn't seal properly, oil flows back into the oil pan, causing the oil pressure to drop after the engine is turned off. In the morning, it takes a long time to rebuild pressure when starting, and the sound of dry friction in the engine at startup is heartbreaking. While driving, the oil pressure warning light on the dashboard may flicker occasionally, especially noticeable when starting after parking on a slope. Once, a friend's car developed a ticking valve noise during acceleration, and upon inspection, it was indeed caused by insufficient oil pressure due to a stuck check valve. The most troublesome part is that it can lead to abnormal wear. My neighbor's car had to undergo a major engine overhaul because of this issue. If you notice longer starting times or oil pressure warnings, it's advisable to check this valve immediately.
