GW4D20, GW4D20B Diesel Injector
Cross-Reference & Technical Specs
Authoritative technical specifications, verified Bosch part numbers, control valve stamping codes, and nozzle spray orifices for the GW4D20, GW4D20B diesel engine family.
All Verified Part Numbers for GW4D20, GW4D20B
The following 1 common-rail injector assembly is calibrated for this engine family. Click the SKU to view individual test bench flow curves, sister cross-references, and vehicle applications.
28239294 / 9308-621CNozzle Code: G379| Part Number (SKU) | Primary OE Reference | Control Valve | Nozzle Code |
|---|---|---|---|
| 28231014, 1112100-ED01A | 28239294 / 9308-621C | G379 |
Verified Vehicle Compatibility
| Make / Manufacturer | Vehicle Model & Platform | Engine Specification | Model Years |
|---|---|---|---|
| Great Wall | Wingle 6 | 2.0 VGT (GW4D20) | 2014-2020 |
| Haval | H6 II | 2.0 Diesel (GW4D20B) | 2017-2021 |
Installation, Tightening Torque & Re-torque Protocol
Strict torque compliance is mandatory on GW4D20, GW4D20B common-rail cylinder heads. Over-torquing stretches the injector body or strips the head clamping threads, while under-torquing allows combustion blow-by past the copper sealing washer:
- Hold-down clamp bolt: no family-specific value published for GW4D20, GW4D20B - consult the OEM service manual. Always clean the cylinder head recess with an injector seat reamer.
- High-pressure rail flare nut: 25-30 N·m using a dedicated 17 mm line wrench.
- Return leak-off banjo bolt: 9-12 N·m with fresh copper washers on both sides of the banjo union.
After fitting replacement injectors on GW4D20, GW4D20B, generate or program the cylinder-specific IMA calibration code into the engine ECU using an OEM-level scan tool (Bosch KTS, Renault CLIP, or VAG-COM) to prevent cylinder power imbalance and rough idle.
Technical Diagnostics FAQ for GW4D20, GW4D20B
What DTC fault codes indicate a failing injector on GW4D20, GW4D20B?
The most frequent fault codes are P0201 through P0204 (Injector Circuit Malfunction on Cylinders 1-4), P2146/P2149 (Injector Group Supply Voltage Error), and P0087 (Fuel Rail Pressure Low due to excessive internal leak-off). Measure solenoid coil resistance across the pins (0.5-1.5 Ω) and perform a graduated-bottle dynamic leak-back test to pinpoint the leaking cylinder.
Can sister SKUs within the GW4D20, GW4D20B family be interchanged?
Not unless explicitly confirmed on the vehicle build plate. While sister SKUs share the same physical outer envelope and 28239294 / 9308-621C control valve, they differ in nozzle spray orifice angle and factory IMA flow calibration. Mixing sister SKUs on the same engine block can trigger rough idle, elevated exhaust gas temperatures (EGT), and MOT emissions failure.
Which specific Bosch injectors fit the GW4D20, GW4D20B engine?
The verified genuine Bosch common-rail injectors engineered for the GW4D20, GW4D20B engine family are:
- Bosch 28236382 Common Rail Injector → (OE: 28231014, 1112100-ED01A) — Control Valve: 28239294 / 9308-621C, Nozzle Code: G379