The main propulsion diesel engines on the fishery research vessel to which you are assigned are fitted with mechanically operated and controlled unit injectors. When are the sintered metal supply and return injector filters typically replaced?
• Unit injector maintenance practices in diesel engines • Purpose and location of sintered metal supply/return injector filters • Difference between system-wide fuel filters (primary/secondary/coalescing) and components that are serviced only when that specific part is opened or overhauled
• Think about when you would physically have access to the tiny sintered metal filters associated with each injector, and whether they are designed for frequent or infrequent replacement. • Consider whether these filters protect the whole fuel system or just the injector itself—how would that influence the replacement interval? • Ask yourself which of the listed service actions normally happens on a routine schedule versus only during more in‑depth component work.
• Identify which options are linked to routine fuel system filter service and which are tied to injector-specific work. • Verify whether sintered metal injector filters are usually considered fine, last‑chance filters located right at the injector inlet/return, not in the common fuel lines. • Confirm which maintenance action most logically coincides with inspecting, cleaning, or replacing injector‑mounted components.
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