An engine that runs rough may indicate a...

Question 1 / 2066636eef28f7522a1c51fa8e

Question 1 of 2066636eef28f7522a1c51fa8e

An engine that runs rough may indicate a misfiring cylinder. Various techniques associated with disabling the injectors sequentially, in turn, may be used to locate the misfiring cylinder on auxiliary diesel engines of the size used on offshore supply vessels. What type of fuel injectors are disabled for troubleshooting purposes by loosening the high-pressure fuel injection line fitting at the injector nozzle?

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🔍 Key Concepts

• high-pressure fuel injection line and how it connects to different injector types • difference between unit injectors and separate nozzles with a common pump • how disabling fuel at the line fitting affects hydraulically vs electronically operated injectors

💭 Think About

• Think about which injector designs have a separate high‑pressure line going from a central pump to each nozzle, allowing you to crack that fitting to stop fuel flow. • For the designs where the pump plunger and nozzle are built into a single unit, would there still be an external high‑pressure line at the nozzle to loosen? • Consider which options involve electronic control versus purely hydraulic/mechanical control and whether cracking a line fitting is a normal troubleshooting step for that type.

✅ Before You Answer

• Verify which options describe unit injectors (pump and nozzle in one body) and whether they normally have an external high‑pressure line to the nozzle. • Check which choices involve separately housed injection pumps feeding separate nozzles through lines—those are the ones where you can usually loosen the line at the nozzle. • Confirm whether loosening a high‑pressure line fitting would be a standard and safe diagnostic method on electronically controlled injectors or more appropriate for traditional hydraulic systems.

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Question 1 of 20

Hydraulically operated injection nozzles where each nozzle is supplied by separately housed injection pump plungers in a multi-plunger pump.

Electronically operated unit injectors where each injection pump plunger and injection nozzle are integrated into one self-contained unit.

Mechanically operated injection nozzles where each nozzle is supplied by a separately housed pressure/time (PT) metering pump.

Question 1 / 2066636eef28f7522a1c51fa8e

Question 1 of 2066636eef28f7522a1c51fa8e

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Question 1 of 20

66636eef28f7522a1c51fa8e

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💭 Think About

✅ Before You Answer

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