What's the whistle in the exhaust pipe?

The whistle of the exhaust pipe is caused by the serious wear or ablation of the valve and seat ring working surface, the appearance of grooves and spots, and the poor air leakage seal. Abnormal sound of air leakage of exhaust valve can be heard at the muffler of exhaust pipe, such as "squeaking" sound when tire air leakage is serious.

The whistle of the exhaust pipe is caused by the serious wear or ablation of the valve and seat ring working surface, the appearance of grooves and spots, and the poor air leakage seal.

Abnormal sound of air leakage of exhaust valve can be heard at the muffler of exhaust pipe, such as "squeaking" sound when tire air leakage is serious. The air leakage of the valve can be heard at the air filter at the upper mouth of the carburetor, and its sound is like the "hiss" sound made by a child when whistling. The reason is that the working face of the valve and seat ring is seriously worn or ablated, and grooves and spots appear, which can not be closed tightly. In addition, because the gap between the valve stem and the guide tube is too large or the valve stem is bent, the valve head cannot be centered and skewed, resulting in air leakage. If the elasticity of the valve spring is weakened or broken, the valve can not be closely attached to the working surface of the seat ring, which will also cause air leakage. In assembly, if the gap between the valve stem and the guide pipe is too small, it will be stuck due to thermal expansion during operation, or if the valve gap is too small, the valve stem will be pushed away by the tappet or rocker arm due to thermal expansion, so that the valve cannot be completely closed, resulting in air leakage.

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