The part number 22012829 refers to a specific generation of fuel injector used in heavy-duty Volvo D13 and Mack MP8 engines.
This is a Delphi (now part of BorgWarner) / L'Orange hydraulic electronic unit injector (HEUI). It is critical to verify the exact engine platform and software version before installation, as the D13 and MP8 use different injector classifications (A, B, C, D, E, F, G, or Twin Injection) depending on the model year and emissions standard.
Here is the detailed breakdown for the 22012829 injector.
1. Identification
Part Number: 22012829
Core Number (Manufacturer): Often cross-references to Delphi 28358457 or L'Orange specific casting numbers.
Type: Unit Injector (EUI)
Technology: High-pressure mechanical actuation (cam-driven) with solenoid control.
2. Applications
This injector is typically found in EPA 07 and EPA 10 (and some early GHG14) emissions models.
3. Critical Compatibility
You cannot mix injector classes arbitrarily.
If you are replacing injectors on a Volvo D13 or Mack MP8, you must look at the label on the valve cover or the software calibration in the ECU.
The injector "Class" (A, B, C, D, E, F, G, or Twin) determines the flow rate and injection timing strategy.
22012829 usually corresponds to Class D or Class E injectors.
If the engine is calibrated for a different class (e.g., Class F or Twin Injection), installing 22012829 will cause:
4. Common Failure Symptoms
These injectors are prone to failure due to:
Sticking plungers: Caused by contaminated fuel or water intrusion.
Solenoid failure: Electrical opens/shorts causing cylinder contribution faults.
High return flow: If the internal check valve or plunger wears, excessive fuel returns to the tank, causing hard starting or no-start conditions when hot.
Common Fault Codes associated with this injector:
Volvo/Mack Mid-128: PID 94 (Fuel Pressure) high or low.
Cylinder Contribution Codes: (e.g., 128, 129, 130, 131, 132, 133).
Injector Circuit Codes: (e.g., 155, 156, 157, 158, 159, 160).
5. Installation Essentials
If you are replacing these injectors:
Trim Codes: After replacing an injector (even with a reman 22012829), you must program the Trim Code (a 5-digit alphanumeric code stamped on the injector body) into the ECU using PTT (Premium Tech Tool) or JPRO. Failure to do so results in rough idle and cylinder balance faults.
Hold Down Bolts: Always replace the injector hold-down clamp bolts. They are torque-to-yield and cannot be reused.
High-Pressure Oil: The D13 and MP8 use engine oil to actuate the injectors (HEUI). You must ensure the engine oil is clean and the oil level is correct; low oil can cause injector misfires even if the injectors are new.
Summary Table
| Specification | Detail |
|---|
| Part Number | 22012829 |
| Engine | Volvo D13, Mack MP8 |
| Era | ~2007–2014 (EPA07, EPA10) |
| Class | Usually D or E (Verify on engine sticker) |
| Type | HEUI (Hydraulic Electric Unit Injector) |
| OEM Cross | Delphi 28358457, Volvo 22012829, Mack 22012829 |
