What should be paid attention to when choosing a piston

秦浪

2022/08/22

The piston is determined according to the cylinder diameter level of the cylinder, which is indicated by a number or letter, and is usually located on the rear side of the cylinder block. Cylinder diameter grades are listed in cylinder order, and the first number or letter is the cylinder diameter grade of cylinder 1.

When using a new cylinder block

Check the cylinder diameter level on the rear side of the cylinder block and select a piston of the same level.

NOTE: The piston and piston pin can be maintained as one assembly.

① When reusing the cylinder block, measure the cylinder diameter with a cylinder gauge.

②Compare the measurement result with the bore diameter value in the "Piston Selection Table" to determine the bore diameter level.

③Select the same level piston.

Piston matching precautions When overhauling the engine, the piston of the same level as the cylinder should be matched according to the repair size of the cylinder. Please note the following points when choosing:
①On the same engine, the pistons of the same manufacturer should be selected to ensure the same material, performance, weight and size; the diameter difference of the same group of pistons should not exceed 0.02 mm

②Measure the gap between the piston and the cylinder wall. Use a dial gauge to measure the outer diameter of the piston, and the measurement should be made in the direction perpendicular to the piston skirt and the piston pin hole. The standard clearance between the piston and the cylinder wall is 0.025~0.045mm. The measuring method is to insert a thickness gauge of 0.04mm between the piston and the cylinder wall, and the pulling force is 2.0~14.7N. The selection principle of the piston 1. The choice of piston should be determined according to the repair size of the cylinder. Usually, the dimension value is marked on the top of the piston. 2. When choosing a piston, the corresponding type of piston must be selected according to the engine type. On the same engine, pistons of the same brand, group or product code should be selected. Pistons of the same product code must be used for the same model to ensure that the difference in diameter and quality of the piston does not exceed the range specified by the original factory. Otherwise, the engine will have problems such as poor combustion, unstable operation, and reduced economy and power. Therefore, when selecting and matching pistons, the corresponding type of piston must be selected according to the type of engine.

piston,Optional

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