When a nozzle tester is being used to test a...

When a nozzle tester is being used to test a...

Question 1 of 270705eccefa2bacbc34ba4d4783d

When a nozzle tester is being used to test a "closed" type fuel injection nozzle, a clogged nozzle orifice will be indicated by a __________.

Question 1 of 27070

Q

When a nozzle tester is being used to test a "closed" type fuel injection nozzle, a clogged nozzle orifice will be indicated by a __________.

🔍 Key Concepts

• Fuel injection nozzle operation – how a closed-type nozzle is supposed to spray when everything is clean and working properly • Effect of orifice blockage – what happens to fuel flow and spray shape when one or more tiny holes are partially or fully clogged • Difference between a normal opening/closing sound and an abnormal spray pattern during nozzle testing

💭 Think About

• Think about what a nozzle tester actually lets you observe directly: what can you see, and what can you hear, when you pump it? • If one or more orifices are clogged, how would that change the spray cone or mist compared with a clean, properly atomized spray? • Which of the listed sounds are more related to pressure opening/closing action of the nozzle valve itself, and which are more related to the way fuel exits through the orifices?

✅ Before You Answer

• Be clear on what a closed-type fuel injection nozzle is and how its spray normally looks (fine, even atomization, correct cone angle). • Focus on the symptom that would most clearly show a restriction at the orifice rather than a problem with the nozzle valve spring or seating. • Ask: during a nozzle test, what would a mechanic primarily rely on to identify a clogged orifice – visual spray quality, or subtle changes in sound?