Prior to starting an auxiliary diesel engine on your vessel, the crankcase oil level must be checked. At what checked level would you be required to add make-up oil?
• How dipstick markings (such as FULL and ADD) are intended to be used by engineers • Why operating with too little lubricating oil in a diesel engine is dangerous • What the manufacturer’s recommended operating range on the dipstick represents
• Look at each choice and ask: at what point would it already be unsafe or clearly too late to protect the engine? • Consider whether you should wait until the oil completely disappears from the dipstick, or act earlier based on marked guidance. • Think about what the ADD and FULL marks are telling you about the minimum and optimum operating levels.
• Identify which dipstick mark usually indicates the minimum safe operating level. • Decide whether it is good practice to let the level fall below that minimum before adding oil. • Confirm which range between dipstick marks is considered acceptable to run without immediately adding oil.
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