Piezoelectric ceramics are made by subjecting piezoelectric profiles to high-temperature calculations under the necessary processing technology, followed by mechanical processing and manufacturing, burning silver electrical grades according to the necessary methods, and polarizing them with alternating voltage electrostatic fields. Crystal material, a kind of functional raw material with piezoelectric effect, is called a piezoelectric ceramic sheet because its production process is similar to that of porcelain production.
In the whole process of diesel vehicle maintenance, the piezoresistive fuel injection pump will cause different common failures and reflections due to different invalid methods. What are the common invalid methods of such piezoresistive fuel injection pumps? How does the car reflect the different invalid ways and what maintenance plan must be? Today, we must have a deep understanding together:
| Failure mechanism | There are a lot of hard particles in diesel, causing high-pressure sealing surface wear (oil, diesel filter or maintenance problems) |
| Vehicle response | Difficulty in starting, weakness, black smoke |
| Static test results | Large oil return, large full load point maybe |
| Repair plan | Replace the control valve plate, the control spool may also need to be replaced |
| Failure mechanism | There are a lot of hard particles in diesel, causing high-pressure sealing surface wear (oil, diesel filter or maintenance problems) |
| Vehicle response | Difficulty in starting, weakness, black smoke |
| Static test results | Large oil return, large full load point maybe |
| Repair plan | Replace the control valve plate, the control spool may also need to be replaced |
| Failure mechanism | The diesel contains water, and the water bubbles explode in the process of transforming from high pressure to low pressure, causing cavitation on the sealing surface |
| Vehicle response | Difficulty in starting, weakness, black smoke |
| Static test results | Large oil return, large full load point maybe |
| Repair plan | Replace the control valve plate and control spool |
| Failure mechanism | There are a lot of hard particles in diesel, causing high-pressure sealing surface wear (oil, diesel filter or maintenance problems) |
| Vehicle response | Difficulty in starting, weakness, black smoke |
| Static test results | Large oil return, large full load point maybe |
| Repair plan | Replace the inlet and outlet valve plates, the control valve plate and control spool may also need to be replaced |
| Failure mechanism | Carbon deposits in nozzle holes or blockage by particles |
| Vehicle response | Car power off |
| Static test results | The injection volume is too small, especially at the full load point |
| Repair plan | Special cleaning fluid ultrasonic cleaning nozzle or replacement nozzle |
The above is a compilation of key points related to common failure modes of piezoelectric injectors. In the repair process of piezoelectric injectors, it is necessary to have a clear and accurate judgment on the wear status of the injector parts, so as to assess whether different parts need to be replaced, so as to achieve better precision maintenance. At the same time, it should be reminded that the disassembly and maintenance methods of Bosch, Denso, and Delphi piezoelectric injectors are not the same. We will continue to introduce you in detail in the future.
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intake gasket was missing
