Practice question

When testing a mechanical diesel injector using a manual nozzle pop tester, what key characteristic should the technician verify?

  1. The electrical resistance of the injector solenoid.
  2. The nozzle opening pressure, spray pattern, and nozzle-seat tightness before opening.
  3. The temperature of the fuel spray.
  4. The speed of the injector needle retraction in milliseconds.

Answer: B — The nozzle opening pressure, spray pattern, and nozzle-seat tightness before opening.

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