A large two-stroke/cycle direct reversing...

Question 1 / 270705eccefa3bacbc34ba4d47d1f

Question 1 of 270705eccefa3bacbc34ba4d47d1f

A large two-stroke/cycle direct reversing diesel engine is to be reversed. Prior to the admission of starting air you must __________.

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Question 1 of 27070

A large two-stroke/cycle direct reversing diesel engine is to be reversed. Prior to the admission of starting air you must __________.

🔍 Key Concepts

• Direct-reversing two-stroke diesel engines – how ahead/astern rotation is obtained • What must be changed so that fuel is injected at the correct time for the new direction of rotation • The role (or absence) of intake/exhaust valve cams in many large two-stroke crosshead engines

💭 Think About

• Ask yourself: on a direct-reversing two‑stroke, what component actually determines WHEN fuel is injected relative to crank angle? • Consider which item must be correctly positioned before starting air is admitted, so that the engine will not try to run in the wrong direction or misfire. • Think about which systems (fuel, valves, lube oil) are typically already running and which one must be mechanically shifted when changing direction.

✅ Before You Answer

• Identify which choice directly affects fuel timing relative to crank angle for ahead vs astern. • Verify which components in a large low‑speed two‑stroke are reversible mechanisms (can be shifted between ahead and astern settings). • Confirm that any action taken prior to starting air should enhance safe starting, not deprive bearings of needed lubrication.

Question 1 of 27070

A large two-stroke/cycle direct reversing diesel engine is to be reversed. Prior to the admission of starting air you must __________.

line up the engine for restarting with light diesel oil

reposition the fuel injection cam

change the intake and exhaust valve cam positions

reduce the main lube oil pressure

Question 1 / 270705eccefa3bacbc34ba4d47d1f

Question 1 of 270705eccefa3bacbc34ba4d47d1f

A large two-stroke/cycle direct reversing diesel engine is to be reversed. Prior to the admission of starting air you must __________.

Back

Question 1 of 27070

A large two-stroke/cycle direct reversing diesel engine is to be reversed. Prior to the admission of starting air you must __________.