| 摘要 |
A forming and processing method for a valve lifter. The forming and processing method includes the steps of: (a) forming a hole in the valve lifter at a site where a cam is slidably contacted with; (b) forming a diameter-increasing section along an edge of the valve lifter, the edge defining a part of the hole and being located on a side with which the cam is slidably contacted; and (c) carrying out a surface treatment to whole of a surface of the valve lifter which surface is on the side with which the cam is slidably contacted.
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