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CD0484. Diesel engine diagnostics

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About this collection

The Seagull CBT bank is organised into modules covering safety, shipboard operations, maintenance and other topics. Original module names and codes are retained to help you find the topic you need.

“Seagull CBT — CD0484. Diesel engine diagnostics” contains 31 questions across 1 collection.

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Sample questions and answers

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The scavenge air pressure has an increasingly negative deviation as shown. What are the TWO most likely causes? Select the TWO correct answers.

Multiple correct answers

  • Worn piston rings.
  • Faulty stuffing box.
  • Dirty exhaust duct after turbocharger.✓ Correct answer
  • Dirty air filter.✓ Correct answer
High contamination of the main lubricating oil has been observed during the spot test. What is the most likely cause? Select the ONE correct answer.

One correct answer

  • High sulphur content in the fuel.
  • Low viscosity of the oil.
  • Ineffective oil cooling.
  • Ineffective oil filtering.✓ Correct answer
Which TWO of these parameters are most commonly used for the evaluation of engine lubrication? Select the TWO best answers.

Multiple correct answers

  • Mean Indicated Pressure in each cylinder.
  • Water content in the lubrication oil.✓ Correct answer
  • Cylinder head temperatures.
  • Main bearing temperatures.✓ Correct answer
The viscosity of the lubricating oil has been found to be low. Which TWO of the following could have combined to cause this? Select the TWO correct answers.

Multiple correct answers

  • High sulphur content in the fuel.
  • Low TBN of the cylinder oil.
  • Worn nozzles of the fuel injectors.✓ Correct answer
  • Worn piston rings.✓ Correct answer
The exhaust gas temperature deviation of a single cylinder shows the following trend. What are the possible causes? Select any answers that you think apply.

One correct answer

  • A leaking exhaust valve.✓ Correct answer
  • Low scavenge air pressure.
  • Low inlet pressure of the oil cooling the pistons.
  • Early combustion caused by the wrong injection timing.

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