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How to repair valve spring

Valve spring after long-term use, elastic down or cut off, and will affect engine work. In the maintenance, should check valve spring is used beyond the prescribed time limit. Available micrometer inch of valve spring free length measurement. Also can use a new spring and old spring in a fast plate, observe its length difference, if the use of spring is better than original new spring free length shortens 10%, it should be replaced. If the valve spring break, in cylinder head place can hear piston touch valve and send out “and, and” knock sound. Found this phenomenon should immediately stop, ready for motivation after cooling decomposition cylinder head, remove valve spring, change new spring, in changing, we should pay attention to the coated with color mark end (namely pitch larger end) toward the cylinder cover a party。

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