When the injection pump plunger issues a card, it will affect the normal operation of the governor, which will easily cause the engine to fly. If it is not handled in time, it will cause serious accidents. 1. The new plunger storage time is too long because the new plunger storage time is too long, resulting in oil loss and oxidation reaction, the plunger rust, the end of a careful cleaning to use the assembly, work caused by the plunger card. In this case, the plunger must be soaked in kerosene or diesel oil for a period of time. Then, the plunger is rotated and repeatedly traversed to grind each other until the plunger pair rotates flexibly and can be assembled and used after careful cleaning. 2. The pump base is uneven. Because the base of the piston sleeve is uneven or dirty, the assembly accuracy of the sleeve is affected, and the assembly of the oil pump plunger is skewed, causing the plunger to issue a card. To check the unevenness of the pump body, pull the fuel injection pump from the body, connect the low-pressure oil circuit and open the fuel tank switch so that the pump body is filled with diesel oil and the outside of the fuel injection pump is wiped clean. If you find oil leaking at the roller, it means that the pump base is not flat, causing diesel leakage. At this point, an old plunger sleeve can be used to coat the sand at the shoulders, into the pump body, rotate and tap the sleeve to grind, after grinding, reinstall and check for oil leakage, such as It is flexible and does not leak oil. 3. Sleeve positioning screw is too long If the plunger sleeve is set too long or when the set screw is installed, the sleeve will be topped and the sleeve will be misaligned, causing the plunger to issue a card. If the set screw is too long, the amount may be short. Do not forget to install the washer when installing the set screw. 4. Plunger bumps are not cleaned when the plunger is assembled, or impurities enter between the plunger pairs. During assembly, care is not taken to pull the plunger against the plunger, causing the plunger to issue a card. Therefore, the assembly should be carefully installed, do not bump the plunger, and clean the plunger pair to prevent impurities from entering the plunger pair. 5. Plunger bending Due to inadvertent handling of the plunger pair during transport, storage, and assembly, the plunger is slightly bent and the card is stuck during operation. This condition should be replaced.
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