What Causes the Clunking Sound in Cars?
1 Answers
Cars making clunking sounds may have small stones stuck in the tire treads. The daily maintenance methods for cars are as follows: 1. Waxing in circular motions: Poor results Many people habitually wax the car body in circular motions, which is incorrect. The correct waxing method is to apply wax in straight lines, alternating between horizontal and vertical strokes, and then follow the direction of rainwater flow for the final pass. This helps reduce the formation of concentric circular halos on the car's paint surface. 2. Too much engine oil: Causes malfunctions When the oil level in the engine oil pan is too low, friction between bearings and journals increases due to insufficient lubrication, accelerating wear and potentially causing bearing seizure. However, if there is too much oil, the crankshaft and connecting rods will churn violently during operation, not only increasing internal power loss but also causing more oil to splash onto the cylinder walls, leading to oil burning issues. Therefore, the oil level in the engine oil pan should be maintained between the upper and lower marks on the dipstick. 3. Over-tightened bolts: Permanent deformation Many fasteners on cars are connected with bolts and nuts, which should have sufficient preload but not be over-tightened. Over-tightening can cause the connected parts to deform permanently under external forces and stretch the bolts, reducing preload and potentially leading to thread stripping or breakage.