What Causes the Abnormal Noise During Cold Start?

[OwenRose]

The reason for the abnormal noise during cold start is: the internal gears of the starter lose lubrication, affecting the timely return of the gears. When starting the engine, the starter rotates to drive the flywheel, which in turn starts the engine. At this point, the engine's speed is driven by the starter, so the engine speed is lower than the starter speed. When the engine speed exceeds the starter speed after starting, the operator manually turns off the ignition switch to cut off the power, and the starter shuts down. Due to dirt inside the starter and ineffective lubrication, the flywheel forces the starter to rotate at the engine's speed. Since there is a speed difference between the two, this causes the starter to produce noise. This noise will only stop when the starter reaches the same temperature as the engine. However, in severe cases, the noise may occur every time the engine is started. To eliminate this noise, cleaning and maintaining the starter or replacing the starter is necessary.