How to Read a Cylinder Bore Gauge?
1 Answers
Method: Keep the cylinder bore gauge perpendicular to the axis of the cylinder. Swing the gauge back and forth, and when the pointer indicates the smallest number, it means the measuring rod is perpendicular to the cylinder axis. This reading is the standard reading. When the large pointer moves clockwise away from the "0" position, it indicates that the cylinder diameter is smaller than the standard size. If it moves counterclockwise away from the "0" position, it means the cylinder diameter is larger than the standard size. More details are as follows: 1. Taking a dial indicator with a measuring range of 0~3mm as an example for comparative measurement: Select an appropriate extension rod as needed and screw it into the rod seat, ensuring the total length of the measuring rod and extension rod is slightly larger than the cylinder diameter. Then, calibrate it with a micrometer. For instance, the cylinder diameter of the Dongfeng EQ6100 engine is 100mm. Adjust the total length of the measuring rod and extension rod of the cylinder bore gauge to a fixed size between 102~103mm, and then calibrate it with a micrometer. If it does not meet the requirements, rotate the extension rod to adjust. After adjustment, lock the extension rod and align the "0" position on the dial with the pointer. Alternatively, set the micrometer to the nominal size of 100mm, insert the measuring rod and extension rod of the cylinder bore gauge into the micrometer, and the pointer should rotate 2~3 turns. 2. Extend the measuring rod of the cylinder bore gauge into the cylinder for measurement: When the handle is tilted left or right, the gauge reading will be larger. The smallest reading on the gauge is the accurate reading, and the data should be recorded. Avoid abrupt movements during measurement; let the measuring rod slowly contact the cylinder liner. The measured surface should be clean, and the dial indicator should avoid contact with water, oil, and dust. For a recently disassembled engine, allow it to cool to room temperature before measurement.
