ISO Test Injector Spring – Size S – Marbed 84.30.xxx

The springs 84.30.002 / 84.30.003 / 84.30.004 / 84.30.005 are key components of ISO test injectors. They determine the nozzle opening pressure (NOP), which is critical for accurate and repeatable diesel pump calibration. Using the correct calibrated spring guarantees that every test bench delivers standardized results, as required by ISO 7440 and ISO 14681.

Key Benefits

• Restores the ISO-specified nozzle opening pressure

• Ensures repeatable and comparable pump test results

• High-precision spring, manufactured to tight tolerances

• Easy replacement during routine maintenance

• Compatible with Marbed ISO injectors and Bosch equivalents

Key Features

• Marbed Codes: 84.30.002, 84.30.003, 84.30.004, 84.30.005

• Compatibility by Type:

  • 84.30.002 → ISO Injector Type I & II

  • 84.30.003 → ISO Injector Type III & IV

  • 84.30.004 → ISO Injector Type VII & VIII

  • 84.30.005 → ISO Injector Type IX

• Function: controls the opening pressure of the calibrating injector

• Material: high-strength alloy steel, precision wound

• Standard: ISO 7440 / ISO 14681 reference components

Operational Use

1. Installed in the body of the ISO test injector.

2. Determines the nozzle opening pressure (NOP) during pump calibration.

3. Should be inspected periodically for wear or fatigue.

4. Replace if NOP readings fall outside ISO tolerance.

Technical Data

• Pressure ranges covered: 130 – 250 bar (depending on Type)

• Spring constant: calibrated according to ISO test injector specifications

• Compatibility: Marbed ISO test injectors, Bosch cross-ref 1 688 901 xxx

Use Cases

• Diesel workshops performing pump calibration

• Test bench operators (Bosch, Hartridge, etc.)

• Preventive maintenance on ISO test injectors