A generator drive diesel engine on your...

Question 1 / 2066636eef28f7522a1c51fc51

Question 1 of 2066636eef28f7522a1c51fc51

A generator drive diesel engine on your general-purpose supply vessel has a misfiring cylinder. After further investigation it has been determined that the injector nozzle for the effected cylinder is faulty. After replacing the injector nozzle with a reconditioned or new one, the injector must be bled of air. Assuming the fuel injection pump is of the in-line multi-plunger type, how is this done?

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🔍 Key Concepts

• How air is removed from high-pressure fuel lines on a diesel with an in-line multi-plunger injection pump • Effect of fuel control rack position (no fuel vs. full fuel) on whether high-pressure fuel is actually delivered to the injector • Where you normally crack a line (injector vs. pump delivery valve) when bleeding individual cylinders

💭 Think About

• Ask yourself: if the rack is in the no fuel position, will the pump elements actually send fuel (and air) up to the injector so it can be bled? • Which connection is normally loosened so trapped air at the highest / end point of the high-pressure line can escape most effectively? • When cranking with the starter, what combination of rack position and loosened fitting would safely allow fuel to flow until a solid stream (no bubbles) appears?

✅ Before You Answer

• Confirm whether fuel must be injected (rack position) for air to be pushed out of the high-pressure line. • Confirm whether you normally loosen the fitting at the injector nozzle or at the pump delivery valve when bleeding a single cylinder. • Verify in your diesel practice: bleeding is done while cranking and lines are re-tightened when a steady, bubble-free flow of fuel appears.

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Question 1 of 20

The engine is cranked over with the starter, and the high pressure fuel line fitting at the delivery valve is loosened with the fuel control rack in the no fuel position.

The engine is cranked over with the starter and the high pressure fuel line fitting at the injector nozzle is loosened with the fuel control rack in the full fuel position.

Question 1 / 2066636eef28f7522a1c51fc51

Question 1 of 2066636eef28f7522a1c51fc51

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Question 1 of 20

66636eef28f7522a1c51fc51

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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