Engine Lube Oil System Quiz

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Questions and Answers

What component helps to seal the strainer at the top during operation?

A mesh covering

An O-ring seal (correct)

A filter element

A locking bolt

Where does the oil flow as it moves through the strainer?

From the bottom to the top

From the top to the bottom (correct)

From the center outward

From the mesh screen inwards

What happens if the O-ring seals are damaged or not sealed properly?

Oil will leak under pressure. (correct)

There will be no flow of oil.

The engine will overheat.

The pressure will become too high.

What does the unperforated outer cylinder provide in the strainer design?

A constant head of oil Signup and view all the answers

How are the main lube oil pump strainers secured in place?

By a crab and hand wheel Signup and view all the answers

What is the primary function of the oil pump strainers?

To filter the oil before pumping Signup and view all the answers

What component is used to drain oil from the strainer housing?

A spring loaded valve Signup and view all the answers

What should be checked in the manifold to the turbo filter during inspection of turbo engines?

Cracks and loose components Signup and view all the answers

What role does the EMDEC control unit perform regarding engine lube oil pressure and temperature?

It monitors and displays data on the EM2000. Signup and view all the answers

What action should be taken if an engine is reported to have low oil pressure?

Take a lube oil sample to check viscosity. Signup and view all the answers

What does EMDEC do if engine conditions move outside normal operating ranges?

Causes an engine shutdown and displays a fault condition. Signup and view all the answers

What should be determined when investigating low oil pressure?

If the pressure transducer is malfunctioning. Signup and view all the answers

What is the primary function of the valve in the lube oil system?

To limit the maximum pressure of the lube oil entering the engine Signup and view all the answers

What happens to excess lube oil pressure when it exceeds the spring tension on the valve?

The valve is lifted off its seat to relieve excess pressure Signup and view all the answers

Which component provides additional protection for the turbocharger's high-speed bearings?

Turbocharger oil filter Signup and view all the answers

What type of construction is used for the filter element in the turbocharger oil filter?

Pleated paper Signup and view all the answers

What is the purpose of the soak back oil system in relation to the turbocharger?

To ensure lubrication of the turbocharger bearings prior to engine start Signup and view all the answers

Where is the turbocharger oil filter mounted?

On the camshaft drive housing at the right bank of the engine Signup and view all the answers

What should be done before installing both types of turbo lube filters?

Fill them with clean oil Signup and view all the answers

How is the separate lube oil pressure source controlled?

Automatically by the locomotive control system Signup and view all the answers

What role does the electrically driven pump play in the soak back oil system?

It draws lube oil from the oil pan and pumps it to the turbocharger Signup and view all the answers

What is the primary purpose of applying a large diameter nozzle to the crankcase?

To increase crankcase suction Signup and view all the answers

What should be done before applying a large diameter nozzle to the crankcase?

Inspect the engine for other causes of low vacuum Signup and view all the answers

What happens to oil droplets in the lube oil separator?

They drain back to the crankcase Signup and view all the answers

During scheduled maintenance, what is essential to check regularly?

The lube oil level Signup and view all the answers

What could grey sludge in the lube oil indicate?

Internal water leaks Signup and view all the answers

What is the consequence of low oil levels in the engine?

High oil temperatures Signup and view all the answers

Why is it important to consult maintenance instructions frequently?

For specific inspection items and frequency Signup and view all the answers

What can the presence of fuel vapors in the oil indicate?

Internal fuel leaks Signup and view all the answers

What should be visually checked on the dip stick during routine maintenance?

Oil level to ensure it is at or near the full mark Signup and view all the answers

Which of the following is NOT part of the regular lube oil maintenance tasks?

Changing the engine oil daily Signup and view all the answers

What should be recorded when adding oil to the diesel engine?

The amount of oil added Signup and view all the answers

What is the purpose of taking an oil sample from the test fitting?

To analyze for internal wear or component failure Signup and view all the answers

Which of the following is NOT a condition that must be checked during a 90-day inspection of oil?

Oil filter color Signup and view all the answers

What should be ensured before opening the oil fill port on the diesel engine?

The area is clean Signup and view all the answers

What does a high consumption rate of oil typically indicate?

There may be serious engine problems Signup and view all the answers

Which aspect of the oil is checked to assess potential internal water leaks?

Free water content Signup and view all the answers

How often should the main oil filters be renewed?

Every 90 days Signup and view all the answers

What is TBN in the context of oil inspections?

Total base number Signup and view all the answers

What should be taken into consideration if unusual results are found during oil analysis?

Recommendations for further checks or tests Signup and view all the answers

Which of the following could indicate internal wear or component failure in the engine?

Trace elements in the oil Signup and view all the answers

What should be inspected for damage before starting the engine related to the scavenging oil system?

The scavenging oil suction line Signup and view all the answers

What is the maximum acceptable pressure reading at the Michiana tank to proceed without further checks?

69 kPa Signup and view all the answers

What should be done if the strainer box fails to refill within 45 seconds after starting the engine?

Take a pressure reading at the Michiana tank. Signup and view all the answers

If the pressure at the Michiana tank is higher than 69 kPa after changing the oil filter, what should be the next action?

Clean the oil cooler. Signup and view all the answers

Which maintenance step is required for the scavenging pump before starting the engine?

Remove and clean the course strainer element. Signup and view all the answers

Which fluid property is measured to assess the condition of the oil in terms of its contamination?

Total dirt load Signup and view all the answers

What does the presence of sodium or boron in the oil indicate during inspections?

Internal water leaks Signup and view all the answers

When should the main oil filters be renewed according to the maintenance instruction?

At 90 days Signup and view all the answers

What potential issue can a high oil consumption rate suggest?

Internal leaks or engine problems Signup and view all the answers

What is the main purpose of taking an oil sample from the lube pump?

To analyze internal wear or component failure Signup and view all the answers

Which property of the oil is checked to determine its ability to neutralize acids?

Total base number Signup and view all the answers

What should be ensured prior to adding oil to the diesel engine?

That the fill port area is clean Signup and view all the answers

What must be done immediately after opening the lube oil filter tank drain valve?

Allow oil to drain back into the engine sump Signup and view all the answers

What indicates faulty check valves in the turbo filter head during the inspection?

Oil flow from the crankshaft or camshafts Signup and view all the answers

What should be checked annually to ensure proper operation of the lube oil system?

Turbo lube pump sequence and system operation Signup and view all the answers

After how many years of service should the lube oil temperature differential be checked?

2 years Signup and view all the answers

What is the primary purpose of applying new seals when renewing the filter elements?

To prevent leakage of lube oil Signup and view all the answers

What may need to be serviced if the lube oil temperature differential is outside prescribed limits?

The cooler Signup and view all the answers

What component must be inspected and cleaned during the strainer housing maintenance?

Element of the strainer Signup and view all the answers

What is required before applying oil to the new filter elements?

Pre-fill both elements with clean engine lube oil Signup and view all the answers

What is the consequence of failing to close the filter tank drain valve after maintenance?

Oil leakage from the filter tank Signup and view all the answers

What should be inspected if the oil temperature is above normal range?

The cooling system and engine sump Signup and view all the answers

What is indicated if there is little pressure leaving the main lube pump?

There may be a blockage on the suction side or an issue with the pump Signup and view all the answers

Which of the following components should be monitored closely for conditions affecting oil pressure?

The lube oil drain valve position Signup and view all the answers

What should you replace if the mechanical gauge and sensor readings differ significantly during operation?

The sensor with a qualified unit Signup and view all the answers

What does a significant drop in pressure across the oil filters suggest?

There may be an obstruction or clog in the filters Signup and view all the answers

When assessing an oil pressure issue, which of the following components is NOT considered?

Turbocharger control unit Signup and view all the answers

What indicates a true low pressure situation in the engine?

Discrepancy between mechanical gauge and sensor readings Signup and view all the answers

What is the primary purpose of fitting a mechanical gauge at the pressure sensor location?

To validate the pressure sensor's accuracy Signup and view all the answers

What might you suspect if the pressure drops dramatically in the oil flow system?

Potential blockages in the filtration system Signup and view all the answers

During an internal inspection of the engine sump, what condition would be most pertinent to check for?

Bearing distress Signup and view all the answers

What component's status should be verified during the inspection of turbo engines?

The manifold to the turbo filter for cracks Signup and view all the answers

Which part of the EMDEC system continually monitors engine conditions?

The pressure sensor at the turbo filter head Signup and view all the answers

What condition can lead to low oil viscosity in an engine?

Internal fuel leakage Signup and view all the answers

What should be performed if the EMDEC detects low oil pressure?

Take a lube oil sample for viscosity testing Signup and view all the answers

What happens when engine conditions exceed normal operating ranges according to EMDEC?

The engine is automatically shut down Signup and view all the answers

Which of the following components is involved in assessing low oil pressure readings?

Pressure transducer Signup and view all the answers

What is the function of EMDEC in relation to the Woodward governor?

Execute low lube oil shutdown Signup and view all the answers

What should be checked in the oil jumper lines during the inspection of blower engines?

Loose or missing components Signup and view all the answers

Which factor does NOT affect the oil pressure readings in an engine?

Fuel quality Signup and view all the answers

In a scenario of low oil pressure, which aspect should NOT be prioritized initially?

Replacing the oil filter Signup and view all the answers

Study Notes

Lube Oil System Introduction

The engine lube oil system is a combination of three separate systems: main lubricating, piston cooling, and scavenging oil systems.
Turbocharged engines use an additional soak back or turbo lube system, and a self-contained pre-lube system may also be available.
Each system has its own oil pump, with the main lube and piston cooling pumps housed together.
The pumps are driven by the accessory gear train.
Diagrams of the complete systems are shown in figures 6.1A and 6.1B for turbocharged and blower engines respectively.

Main Lubricating System

The main lubricating oil system pressurizes most engine parts.
Oil is drawn from a strainer housing at the front right of the engine.
The oil is then fed to a main oil manifold located above the crankshaft.
Oil pressure relief is controlled by a valve.
Oil tubes direct oil to the main crankshaft bearings.
Crankshaft passages provide oil for connecting rod bearings, torsional dampers, and accessories.
Leak-off oil from adjacent bearings lubricates the crankshaft thrust bearings.
Oil is carried to the gear train at the rear of the engine, which distributes oil to various parts.

Piston Cooling Oil System

The piston cooling oil system pumps oil from a common suction with the main lube oil pump.
Oil is distributed to piston cooling manifolds on each side of the engine.
Oil pipes direct oil to the underside of the piston crown and ring belt.
Excess oil drains into the sump.

Scavenging Oil System

The scavenging oil system utilizes a pump to collect oil from the oil pan sump.
Oil passes through strainers and coolers before returning to the main lube oil and piston cooling pumps..
Excess oil drains back to the oil pan through a dam in the strainer housing.
The system is designed to filter and cool the oil before it returns to the main system to maintain optimal performance and prevent overheating issues of the components.

Oil Gauge

The oil level is maintained between the low and full marks on a gauge.
The gauge is located on the side of the oil pan.
Readings are taken when the engine is idling at operating temperature.

Lubricating Oil Pressure

Adequate oil pressure is required while the engine is running.
Oil pressure rises immediately after engine start and idling.
Oil pressure may reach a higher pressure for cold oil.
Maximum pressure is limited by a relief valve.

Turbocharger Oil Filter

Provides additional protection and filtration before oil enters the turbocharger.
The filter element is pleated paper and disposable.

Soak Back Oil System

Ensures lubrication of turbocharger bearings before engine start-up.
Removes residual heat.
Automatically controlled by the locomotive control system.
A motor driven pump draws oil from the oil pan through a filter, then directly into the turbocharger bearing area.
System pressure is controlled by a 55 psi pressure relief valve, and a 70 psi bypass valve.

Lube Oil Separator

Separates oil vapor from the exhaust for turbocharged and blower engines.
Draws vapor from the engine via an oil pan suction line and returns oil to the engine.
The separator element is a wire mesh screen.
The separated oil is returned to the engine.

System Maintenance

Proper maintenance is part of a schedule (daily/trip and 90-day and 6-year inspections).
Items to check include total dirt load, TBN, free water, trace elements, sodium/boron, viscosity and frequency.
Inspections vary by type of inspection (daily, 3 year, 6 year)(checking elements and components).

Low Oil Pressure and High Oil Temperature

Procedures for addressing low oil pressure and high oil temperatures are covered in detail.
These procedures involve checks of oil levels, temperatures, filter conditions, and other factors to address issues.
Low oil pressure can be caused by several factors, such as issues with the oil pump, filter blockages, or leaks in the system.
Excessive oil use can indicate issues like worn piston rings, cracks in engine parts, or leaking seals..
High oil temperature can be caused by insufficient cooling, issues with the cooling system, or excessive engine load.
Inspection procedures outline steps to identify the root causes of low/high oil pressure issues.

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Description

Test your knowledge on the components and functions of engine lube oil systems. This quiz covers topics such as oil strainers, O-ring seals, and pressure management. Perfect for students and professionals in automotive engineering.