Diesel Engine Quiz and Flashcards: Understanding Diesel Engine Operation

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Questions and Answers

How are the majority of stationary industrial type diesel engines started?

By using solar power

With the use of electric starter motors

By manual crankshaft rotation

With the use of compressed air (correct)

What is the purpose of directing air to an air motor in diesel engine starting?

To carry out the cranking (correct)

To ignite the fuel in the cylinder

To cool down the engine

To increase the air charge temperature

What is the typical air pressure used for the starting motor in diesel engines?

1000 kPa

1200 kPa

1400 kPa (correct)

1600 kPa

What is continuously circulated to ensure quick and reliable starting of emergency generators powered by diesel engines?

Lubricating oil Signup and view all the answers

What must be strictly adhered to when manufacturer instructions are available for operating diesel engines?

Manufacturer instructions Signup and view all the answers

What is the purpose of the thermostat in the engine cooling system?

To divert coolant flow back to the radiator to regulate engine outlet temperature Signup and view all the answers

Why do high-speed automotive type diesel engines run best with cooling water temperatures near boiling point?

To improve the sealing clearance between the pistons and the cylinders Signup and view all the answers

What happens when coolant temperatures exceed the manufacturer's recommendation in the engine?

Combustion gases leak into the crankcase due to less effective oil coating on cylinder walls Signup and view all the answers

Why do larger industrial type engines run most efficiently with lower cooling water temperatures?

To prevent cylinder deposits and reduced engine efficiency Signup and view all the answers

What is the purpose of the closed loop glycol solution in relation to the engine oil cooler?

To cool the engine oil for proper lubrication and prevent oil drag on pistons Signup and view all the answers

What is the purpose of the air-distributing device in a diesel engine?

To direct high-pressure air to each cylinder for the power stroke Signup and view all the answers

What should be done before starting up a diesel engine to ensure prompt delivery of lubricating oil to all the moving parts?

Fill all lubricators and open the feeds Signup and view all the answers

What is the purpose of injecting fuel into the cylinders after starting the engine?

To facilitate burning fuel in all cylinders Signup and view all the answers

What may cause incomplete combustion in a diesel engine?

Improper fuel injection, insufficient combustion air, and unsuitable fuel Signup and view all the answers

Why do open cooling systems for diesel engines require considerable water treatment?

Because the cooling water is full of environmental contaminants Signup and view all the answers

Study Notes

Diesel Engine Starting and Operation

Majority of stationary industrial type diesel engines are started using air motors.
Directing air to an air motor in diesel engine starting is necessary to provide the power required to turn the engine over.

Air Pressure and Starting

Typical air pressure used for the starting motor in diesel engines is around 125-150 psi.

Emergency Generator Starting

Lubricating oil is continuously circulated to ensure quick and reliable starting of emergency generators powered by diesel engines.

Manufacturer Instructions

When manufacturer instructions are available for operating diesel engines, they must be strictly adhered to.

Engine Cooling System

The thermostat in the engine cooling system ensures that the engine operates within a safe temperature range.
High-speed automotive type diesel engines run best with cooling water temperatures near boiling point (around 194°F) to achieve optimal engine performance.
If coolant temperatures exceed the manufacturer's recommendation, engine damage may occur, such as overheating, corrosion, and premature wear.
Larger industrial type engines run most efficiently with lower cooling water temperatures (around 160°F) to reduce thermal loading and improve engine longevity.

Cooling System Components

The closed loop glycol solution is used to cool the engine oil cooler, which helps to reduce engine oil temperatures and prevent overheating.
The air-distributing device in a diesel engine ensures that air is distributed evenly to all cylinders, promoting efficient combustion and reducing emissions.

Pre-Start Checklist

Before starting up a diesel engine, the lubricating oil system should be primed to ensure prompt delivery of lubricating oil to all moving parts.

Fuel Injection

Injecting fuel into the cylinders after starting the engine helps to maintain optimal engine performance and reduce emissions.

Combustion Issues

Incomplete combustion in a diesel engine can be caused by factors such as low compression, faulty fuel injection, or inadequate air supply.

Cooling System Maintenance

Open cooling systems for diesel engines require considerable water treatment to prevent corrosion, scaling, and fouling, which can lead to engine damage and reduced performance.

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Description

Test your knowledge of diesel engine operation with these notes on starting and general remarks. Learn about the use of compressed air and electric starter motors, and the importance of adhering to manufacturer instructions.

Diesel Engine Operation Notes