What Causes the Squeaking Sound During Cold Start?
1 Answers
The reasons for the squeaking sound during cold start are: 1. Aging of the generator belt, which is made of rubber. Affected by thermal expansion and contraction, the belt contracts when cold. Combined with daily stretching from rotation, this can cause belt slippage during cold starts, producing noise; 2. Issues with the valve tappet. During cold starts, engine oil is pressurized from the oil pump through the engine oil passages to reach the valve tappet, which can amplify the startup sound; 3. Lack of lubrication in the starter motor's internal gears, causing sticking and affecting timely gear retraction; 4. Malfunction of the carbon brushes inside the starter motor.