The main engines on your offshore supply...

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Question 1 of 2066636eef28f7522a1c51fe7b

The main engines on your offshore supply vessel utilize a starting system similar to that shown in the illustration. When starting the engine, an excessive amount of oil mist exits the air starter exhaust port. Which of the listed conditions would account for this? Illustration MO-0203

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Question 1 of 20

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🔍 Key Concepts

• Function of an in-line lubricator in an air starting system • How needle valve opening affects the amount of oil carried in the air stream • Where oil from the air starter lubricator will appear when the system is operating (especially at the air exhaust port)

💭 Think About

• If you see an excessive oil MIST at the air starter exhaust, is that more likely caused by a restriction (less flow) or by more oil being introduced into the air stream? • Which components listed directly control how MUCH oil is fed into the air line versus which would tend to reduce or limit the oil flow? • Would excess oil inside the engine cylinders normally exit through the air starter exhaust, or would it more likely appear somewhere else on the engine?

✅ Before You Answer

• Identify which choices would reduce oil flow in the air line (restriction or insufficient opening) and which would increase it. • Trace the air path from the air supply → strainer → lubricator → air starting motor → air exhaust and decide at which point extra oil could be added to create more mist at the exhaust. • Be sure the condition you pick is one that acts directly on the air starter lubricator, not primarily on the engine cylinders.

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