MDE 15 End of Unit Quiz

MDE 15 End Of Unit Quiz

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Question 7:

What should be done if the engine does not start or exhibits abnormal behavior during the initial startup?

B) Shut down the engine and perform a thorough check

C) Increase the throttle

D) Add more fuel

A) Continue to try starting the engine

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Question 4:

What is the purpose of removing the fuel injectors before removing a cylinder head on a four-stroke diesel engine?

A) To increase the engine’s compression

C) To relieve pressure within the combustion chamber

D) To remove all lubricating oil from the cylinder head

B) To allow easy rotation of the crankshaft

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Question 6:

What should be done if there is a significant amount of debris or metal particles found in the oil pan during the bearing replacement process?

D) Immediately replace the entire engine

C) Ignore the debris if it is not excessive

B) Clean the debris from the oil pan and replace the oil filter

A) Continue with the bearing replacement and monitor performance

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Question 4:
Before removing a cylinder head on a four-stroke diesel engine, why should the cooling system be drained?

A) To prevent coolant contamination

B) To ensure the cooling system is clean

D) To lower the engine’s temperature

C) To avoid leakage into the combustion chamber

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Question 3:

Which type of lubrication is critical to verify before starting an engine with a new cylinder liner?

D) Transmission oil lubrication

C) Engine oil lubrication

B) Hydraulic system lubrication

A) Coolant system lubrication

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Question 6:

What is a common procedure to check the piston for proper fit in the cylinder liner?

D) Measure the piston crown temperature

C) Inspect the piston for carbon deposits

B) Check piston for free play in the liner

A) Measure piston ring gap

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Question 5:

Before starting an engine for the first time after maintenance, why is it important to check the oil level and quality?

C) To improve fuel consumption

B) To ensure proper lubrication and performance

D) To increase engine power

A) To reduce engine noise

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Question 4:

Which calibration technique is used to measure the wall thickness of a cylinder liner?

C) Using a bore gauge to measure the internal diameter

B) Using a dial gauge to check for ovality

D) Using a caliper to measure the total length of the liner

A) Using a micrometer to measure the outer and inner diameters

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Question 2:

What should be done if the piston’s ring grooves show excessive wear during inspection?

A) Replace the piston rings only

C) Replace the piston and rings together

D) Clean the piston and reuse it

B) Reface the piston to reduce wear

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Question 5:

What should be done immediately after unbolting the cylinder head on a four-stroke diesel engine?

D) Apply new sealing compound

C) Inspect the piston and liner

B) Remove the valve cover

A) Tap the cylinder head lightly to break the seal

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Question 1:

What is the first step to take when preparing to remove a four-stroke diesel engine cylinder head?

C) Disconnect the cooling system

B) Lock the engine turning gear

A) Remove the fuel injectors

D) Release stored energy, including air and hydraulic pressures

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Question 5:

After replacing the bottom end bearings, what is a key step before starting the engine?

A) Refilling the engine oil and coolant

D) Checking the fuel system for leaks

B) Reinstalling the exhaust system

C) Replacing the air filter

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