Engine Lubrication System Problems: Quiz and Flashcards

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Questions and Answers

What is the most common cause of low engine oil pressure?

Incorrect oil viscosity

Faulty pressure regulating valve (correct)

Plugged oil cooler

Cracked oil lines

How can the length of time since the last engine overhaul help diagnose low oil pressure?

It can indicate if the oil pressure was slowly getting worse over time (correct)

It can determine if the low oil pressure is expected

It can pinpoint the exact cause of the low oil pressure

It can help identify if the oil pump needs to be replaced

What is the primary cause of high engine oil pressure?

Engine re-programmed to operate at a higher speed (correct)

Plugged oil cooler

Incorrect oil viscosity

Faulty oil pressure sending unit

What is the most likely cause of high engine oil temperature?

Metal-to-metal contact Signup and view all the answers

How can noise indicate oil starvation in the engine?

Noise may indicate oil starvation at the crankshaft during engine load changes Signup and view all the answers

What is the primary cause of an increase in oil clearances within the engine?

Wear at the crankshaft journals and friction bearings Signup and view all the answers

What can cause increased oil consumption in off-road engines?

Intermittent incorrect oil levels Signup and view all the answers

What issue can arise if thinner oil is used in an engine?

Increased oil film friction Signup and view all the answers

Why is changing to a higher viscosity oil not recommended to reduce oil consumption before knowing the reason?

It may not solve the root cause Signup and view all the answers

What can happen if too much oil is poured into the oil pan?

Air whirling in the crankcase Signup and view all the answers

Why is proper oil selection critical for engine operation?

To prevent metal-to-metal contact Signup and view all the answers

What could be a result of low oil pressure in an engine?

Metal-to-metal contact Signup and view all the answers

Why is a mechanical oil pressure gauge installed in place of the pressure indicator on the dash?

To verify dash indicator accuracy Signup and view all the answers

What could result from installing a mechanical oil pressure gauge and finding low oil pressure?

Engine seizing during operation Signup and view all the answers

Why should the test gauge results be compared with the readings of the dash indicator?

To verify the dash indicator's reliability Signup and view all the answers

What could occur if low oil pressure is not addressed?

Metal-to-metal contact in the engine Signup and view all the answers

Which of the following is NOT a way to diagnose faults in a lubrication system using your senses?

Tasting the oil to check for impurities Signup and view all the answers

What can cause increased oil consumption in an aging engine?

Both worn piston rings/liners and pressurized combustion gases passing into the crankcase Signup and view all the answers

Which engine design factor can contribute to increased oil consumption?

Engines designed for continuous light-load operation Signup and view all the answers

What can an inspection of the oil filler opening reveal about the lubrication system?

Oil breakdown and crankcase sludge buildup Signup and view all the answers

Which component, shown in the provided figure, can also reveal signs of oil problems?

The dipstick Signup and view all the answers

What is the root cause of metal-to-metal contact noises in a lubrication system?

Oil film failure Signup and view all the answers

Study Notes

Low Engine Oil Pressure

The most common cause of low engine oil pressure is worn engine bearings.
The length of time since the last engine overhaul can help diagnose low oil pressure, as worn engine bearings are more likely in an engine that has not been overhauled recently.

High Engine Oil Pressure

The primary cause of high engine oil pressure is a faulty relief valve or a restricted oil system.

High Engine Oil Temperature

The most likely cause of high engine oil temperature is a blocked oil cooler or a malfunctioning cooling system.

Oil Starvation

Noise can indicate oil starvation in the engine, as it can cause metal-to-metal contact, leading to knocking or clunking sounds.

Oil Clearances

The primary cause of an increase in oil clearances within the engine is wear on the engine bearings and cylinder walls.

Increased Oil Consumption

In off-road engines, increased oil consumption can be caused by air filter blockage or inadequate air filter maintenance.
In an aging engine, increased oil consumption can be caused by worn piston rings and cylinder walls.

Oil Selection

Using thinner oil in an engine can cause increased oil consumption and wear on engine components.
Changing to a higher viscosity oil is not recommended to reduce oil consumption before knowing the reason, as it can increase oil pressure and lead to engine damage.
Proper oil selection is critical for engine operation, as it affects engine performance, fuel efficiency, and component longevity.

Oil Capacity

Pouring too much oil into the oil pan can cause oil to overflow into the engine's crankcase, leading to engine damage.

Engine Damage

Low oil pressure can result in engine damage, including wear on engine bearings and components.
A mechanical oil pressure gauge can be installed in place of the pressure indicator on the dash to provide accurate oil pressure readings.
If the test gauge results indicate low oil pressure, it can lead to engine damage if not addressed.
The test gauge results should be compared with the readings of the dash indicator to ensure accuracy.

Diagnosing Faults

One way to diagnose faults in a lubrication system is through visual inspection, such as inspecting the oil filler opening for signs of oil leaks or contamination.
The oil pump screen can also reveal signs of oil problems, such as blockages or debris.
The root cause of metal-to-metal contact noises in a lubrication system is oil starvation, which can lead to engine damage.
Failure to address low oil pressure can result in catastrophic engine failure.

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Description

Learn how to diagnose and repair faults related to lubrication systems and components by using your senses to isolate or pinpoint the problem. Understand the indications of metal-to-metal contact and oil film failure.

Troubleshooting Lubrication System Faults

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