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?
ā¢ How air is removed from high-pressure fuel lines on a diesel with an in-line multi-plunger injection pump ā¢ Effect of fuel control rack position (no fuel vs. full fuel) on whether high-pressure fuel is actually delivered to the injector ā¢ Where you normally crack a line (injector vs. pump delivery valve) when bleeding individual cylinders
ā¢ 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? ā¢ Which connection is normally loosened so trapped air at the highest / end point of the high-pressure line can escape most effectively? ā¢ 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?
ā¢ Confirm whether fuel must be injected (rack position) for air to be pushed out of the high-pressure line. ā¢ Confirm whether you normally loosen the fitting at the injector nozzle or at the pump delivery valve when bleeding a single cylinder. ā¢ 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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