1. 387-9438 Common Rail Injector Technical Support
1.1. 387-9438 Common Rail Injector Part Number Location
E.g.：See the common rail injector part number as follows:
Pic No.1
| No. |
Name |
| A |
brand, logo, part number,
series number |
| B |
nozzle part number |
1.2. 387-9438 Common Rail Injector Application Scenarios
Common rail system is an oil supply method refers to the fuel oil from the fuel tank sucked out by the gear pump through the oil-water separator and the gear pump to fuel fine filter, high-pressure pump, common rail pipe, and common rail injector, all together with the closed-loop fuel supply system composed of sensors and ECU that completely separates the generation of injector pressure and the injector process from each other.
Pic No.2
| No. |
Name |
No. |
Name |
No. |
Name |
No. |
Name |
| 1 |
Tank |
5 |
Common Rail
Pressure Sensor |
9 |
Engine Crankshaft Sensor |
A |
High Pressure Oil Circuit |
| 2 |
Fuel Filter |
6 |
Common Rail Pipe |
10 |
Camshaft Sensor |
B |
Low Pressure Oil Circuit |
| 3 |
High-Pressure Pump |
7 |
Common Rail Injector |
11 |
ECU Electronic Control Unit |
/ |
/ |
| 4 |
Fuel Gear Pump |
8 |
Accelerator Pedal |
/ |
/ |
/ |
/ |
1.3. Reasons For 387-9438 Common Rail Injector Not Working Normally
- There is air in the oil circuit of the engine fuel system.
- Vehicle oil pump oil supply system is not normal.
- Engine common rail system oil leakage or pressure limiting valve is damaged.
- There is a short circuit, cutting out and poor contact in the wiring harness connected to the common rail injector of the vehicle.
- The long-term placement of the common rail injector causes the anti-rust oil to solidify, and the internal components are stuck or the oil holes are blocked.
Before installing, carefully check whether other components in the common rail system except the common rail injector is damaged so as to prevent the common rail injector from not working properly after being replaced.
1.4. Causes of 387-9438 Common Rail Injector Being Damaged
- Failure to operate correctly according to the engine maintenance manual during disassembly and assembly resulted in damage to the common rail
- The fuel used for the vehicle does not meet the standard, causing damage to the common rail injector, such as: the water content in the fuel oil exceeds the standard, iron powder, aluminum powder, sulfide impurities exceed the standard, etc.
- The engine is not regularly maintained according to the engine maintenance manual (please refer to the vehicle maintenance manual for the maintenance mileage). For example, failure to replace the lubricating oil of the engine system for a long time will cause abnormal wear of the engine, excessive exhaust gas volume or a large amount of carbon deposits inside the engine. The filter is not replaced during maintenance or the replaced filter cannot reach the original filter standard. All above reasons can cause damage to the common rail
- The abrasion of the oil pump produces iron powder and aluminum powder enter the common rail injector and cause damage to the common rail
- The deformation and abrasion of fuel tank result in iron powder or aluminum powder entering the common rail injector and causing damage to the common rail
- The common rail injector is damaged due to replacement or adjustment of the relevant parts of the common rail For example, the valve clearance does not meet the standard after the engine is repaired, the replacement or modification of the wiring harness connected to the common rail injector fails to meet the original standard.
- The engine is overheated and overloaded for a long time working results in damage to the common rail
- The common rail injector will be damaged naturally at the end of its working life.
- The common rail injector is magnetized (common rail injector parts’ magnetic exceeded) causing the common rail injector to not work properly.
- Before replacing the common rail injector, please check the engine parts carefully according to the engine maintenance manual to avoid the common rail injector being damaged again after replacement.
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