When replacing the cylinder liner and piston of full-automatic mixer truck, it is considered that the new cylinder liner and piston are standard parts and interchangeable, so they can be used after being installed. In fact, the dimensions of cylinder liner and piston have a certain tolerance range. If a large cylinder liner is equipped with a small piston, the matching clearance will be too large, resulting in weak compression and difficult start.
Therefore, it is necessary to check the size grouping code of standard cylinder liner and piston during replacement. The installed cylinder liner and piston must make the size grouping code of standard piston the same as that of standard cylinder liner. Only in this way can we ensure that there is a standard fit clearance between them.
In addition, while installing cylinder liners and pistons with the same group code, pay attention to the inspection of cylinder plug clearance before installation. In order to ensure the assembly standard, a test should be carried out before installation to prevent the installation of fake and inferior defective products.
In addition, during the commissioning of automatic mixer truck, many maintenance personnel do not pay attention to checking the travel allowance of mixer truck. The so-called stroke margin of the mixer truck refers to the amount of upward movement of the mixer truck after it is pushed to the top dead center by the cam on the camshaft. After adjusting the start time of oil supply, the reason why the travel allowance should be checked is that the travel allowance of the mixer truck is related to the wear of the mixer truck and sleeve.
After the mixer truck and the sleeve are worn, the mixer truck needs to move upward for a long time to start oil supply, which delays the start time of oil supply. When the adjusting bolt is screwed out or the thicker adjusting cushion block and gasket are replaced, the low position of the mixer truck is moved up to reduce the stroke margin of the mixer truck. Therefore, when maintaining and debugging the fuel injection pump, check the stroke allowance to determine whether the fuel injection pump is still allowed to be adjusted.
During the inspection, the following different methods shall be adopted according to the different structures of the fuel injection pump: rotate the camshaft, put the mixing roof to the top dead center, remove the oil outlet valve and valve seat, and measure with a depth vernier. After the mixer truck is pushed to the top dead center, pry up the spring seat of the mixer truck spring with a screwdriver to make the mixer truck rise to the high point. Then insert a thickness gauge between the lower plane of the mixer truck and the tappet adjusting bolt for measurement.
The consequences of installing new cylinder liners and pistons of mixer trucks without matching are the above contents. If you want to know more, please visit www.zkzsljbc.com Com.