Symptoms of a Bad Valve Stem Seal?

[VanMicah]

Symptoms of a bad valve stem seal are as follows: 1. The engine burns oil, emitting blue smoke. 2. Severe carbon buildup on the spark plugs, resulting in decreased engine power. 3. Reduced sealing leads to insufficient cylinder pressure, causing a drop in engine power. 4. Accelerated oil consumption, and in severe cases, directly causing engine seizure due to lubrication and cooling failure. Reasons for valve stem seal damage are as follows: 1. Incorrect alignment of threads or splines during assembly, where misaligned parts may leak oil due to poor sealing. 2. The tightness of the spring does not meet the technical requirements. Too tight can cause improper fit between the seal and the rotating shaft, leading to abnormal wear; too loose can result in insufficient pressure to maintain a tight seal, failing to achieve the desired sealing effect.