Precise and regulated Bosch diesel common rail system maintenance process

At present, the common rail fuel injection system of the domestic fuel injector is easy to damage, and the EFI system is relatively high on the maintenance personnel's technical and maintenance environment, resulting in maintenance of many repair points simply do not fly, owners often need repeated maintenance, impact Attendance has caused great losses for many owners. Here is a video of maintenance of Bosch diesel common rail, share it with everyone.

●   The first step: Admission check

Visually inspect the appearance of the injector first to see if the part is complete, if the injector assembly has been disassembled, and if the housing wears heavily.

Then use a multimeter to conduct the electromagnetic valve organization test. Connect the two pens of the multimeter to the two terminals of the solenoid valve to see if they are connected.

●   The second step: external cleaning

Remove O-rings and gaskets first, and then plug holes to prevent phosphorus-containing water from entering the nozzle and corroding the nozzle. Clean the surface with a suitable cleaner and a soft-bristled brush. Since the nozzle is thinner than the hair , so do not use wire brushes, otherwise it will damage the nozzle.

In order to thoroughly clean the fuel injector, a 70-degree non-phosphorus detergent must be used after hand-washing. Ultrasonic dipping is required for 20 minutes.

●   The third step: rapid detection

Use Bosch dedicated tester EPS200 to judge whether the injector leakage, return oil quantity and the injection quantity of each working condition meet the requirements.

Since the standard pressure of the nozzle is about 1600 atmospheres, it is necessary to pay attention to cover the instrument protection cover during the test and beware of accidents.

●   Step 4: Removing Parts

Vertically fix the injector in the dismantling and pressing device, remove the nozzle, and then remove the solenoid valve. Pay attention to the direction of the terminal installation, and mark it properly. Then, remove the valve fastening screw, valve assembly, and high pressure seal ring.

●   Step 5: Internal Parts Cleaning

The disassembled parts should be cleaned first, using a 70-degree detergent, and soaked in ultrasonic for 15 minutes.

●   Step 6: Evaluate Parts

After the cleaning is completed, the parts must first be evaluated. For the evaluation of unqualified parts, the original parts must be replaced.

Remove the injector repair kit from the warehouse, unpack it, remove the parts that need to be replaced, and then soak it in clean diesel.

●   Step 7: Component Assembly

All components to be assembled must be blown dry with clean compressed air before entering the assembly plant via clean channels.

In an advanced dustless wall and air evolution workshop, use the assembly adjustment tool set, select the appropriate adjustment pad according to the assembly process, and adjust the fuel injector mechanical structure to the specification requirements.

●   Step 8: Injector Test

Use Bosch EPS815 or EPS708 to check whether the hydraulic performance of the injector meets the factory requirements. Personnel operating the test bench must participate in the appropriate Bosch training and obtain qualifications. After the test is completed, the entire maintenance process is completed. Then delivered the customer on the test machine.

● Maintained injector

  Qualified injectors meet the following criteria:

1, the appearance of no damage 2, the internal wear parts have been replaced 3, the mechanical structure is finely adjusted 4, through the hydraulic test in accordance with the factory specifications

●   Loading test machine to deliver customers

The repaired injector must be packed in multiple layers and kept clean. Finally, it is also necessary to carry out a loading test on the repaired injectors and deliver them to customers without any problems.

The above is the maintenance of the Bosch diesel common rail system. Look at their maintenance and think about our usual maintenance. It's a world of difference. I just don't know if the cost of such professional maintenance is as high as the maintenance quality. If conditions permit, we still hope that everyone's machines will receive professional repair services.

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