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WorksheetsMS60K Engine Diagnostic Procedures Pt 1
Total questions: 45
Worksheet time: 23mins
What is one effect of excessive bore wear in a cylinder?
Increased fuel efficiency
Loss of compression
Improved engine performance
Reduced oil consumption
What symptom might occur if the crankcase becomes too pressurized?
Increased engine power
Oil leaks from engine seals
Reduced engine noise
Improved fuel economy
What is the approximate combustion pressure during the combustion stroke at 6000 rpm in petrol engines?
50 bar
75 bar
100 bar
25 bar
What is the load exerted on the piston due to combustion pressure at 6000 rpm?
3 t
5 t
7 t
9 t
What is the purpose of the piston pin offset in petrol engines?
To increase engine speed
To reduce fuel consumption
To combat high wear on the cylinder wall
To enhance combustion efficiency
By how much is the piston pin axis offset to combat pressure strain?
5-6% of the piston diameter
3-4% of the piston diameter
1-2% of the piston diameter
7-8% of the piston diameter
What is a second effect of a worn cylinder bore?
Excessive blue smoke
Increased fuel efficiency
Reduced engine noise
Improved acceleration
Which test is used to diagnose a worn cylinder bore?
Compression test
Brake test
Speed test
Temperature test
What action should be taken if a cylinder bore is worn?
Dismantle engine and renew piston rings
Increase oil levels
Have the cylinder re-bored
Replace the air filter
What is an advantage of using cylinder liners in engines?
They are more expensive to replace.
They allow for the use of standard pistons with new rings.
They decrease engine capacity.
They require larger pistons and rings.
What is a potential downside of a re-bore in an engine?
It increases engine reliability.
It decreases engine capacity.
It may reduce reliability due to larger bores being closer to block water jackets.
It allows for smaller pistons and rings.
What can cause piston damage in an engine?
Overheating due to lack of coolant
Pre-ignition or engine 'pinking'
Excessive oil pressure
Low fuel quality
What can a compression and cylinder leakage test confirm?
Fuel efficiency
Piston damage
Oil level
Spark plug condition
What is the temperature at the piston crown during operation?
150 °C
250 °C
350 °C
450 °C
Why is the thermal expansion of the piston uneven?
Due to uniform heating
Due to uneven heating
Due to material defects
Due to external pressure
How are pistons designed to compensate for different thermal expansions?
With a square cross-section
With a circular cross-section
With an oval cross-section
With a triangular cross-section
What is a consequence of piston rings wearing over time?
Increase in combustion pressures
Decrease in combustion pressures
Improved engine performance
Reduced fuel consumption
What can happen if the combustion temperature becomes excessively high?
The piston ring can become fused to the piston
The piston ring will expand and improve performance
The piston ring will shrink and cause leaks
The piston ring will remain unaffected
What is the effect of a piston ring becoming fused to the piston?
It will cause the piston ring to score the bore
It will enhance the engine's efficiency
It will reduce the engine's noise
It will increase the engine's lifespan
What is the most vital concern with the crankshaft?
Temperature control
Oil supply
Vibration reduction
Noise reduction
What can Plastigauge be used to measure?
Temperature
Pressure
Bearing clearances
Vibration
What is a key factor for the camshaft that, if restricted, can cause the bearings to overheat?
Air flow
Oil feed
Coolant level
Fuel mixture
What can happen if the camshaft seizes in the head due to oil feed restriction?
The engine will run smoothly
The cambelt/chain may snap
The fuel efficiency will increase
The exhaust will become quieter
What is the purpose of performing a compression loss test?
To increase engine power
To check for leaks in the cylinder chamber
To clean the cylinder
To adjust the piston position
What must be the position of the piston during a cylinder leakage test?
BDC position
Halfway position
TDC position
Any position
What is used to pressurize the cylinder in a cylinder leakage test?
Water
Compressed air
Oil
Steam
What indicates a fault during a cylinder leakage test?
Increase in temperature
Change in color
Sound of air escaping
Vibration of the engine
What does airflow noise from the intake system indicate?
Exhaust valves are leaking.
Intake valves are leaking.
Piston rings are leaking.
Cylinder block is leaking.
If airflow noise is detected from the exhaust system, what is likely leaking?
Intake valves
Piston rings
Exhaust valves
Cylinder head gasket
Airflow noise from the oil filler neck suggests a leak in which component?
Intake valves
Exhaust valves
Piston rings
Cylinder head
What does airflow noise from the coolant expansion tank cap indicate?
Intake valves are leaking.
Exhaust valves are leaking.
Piston rings are leaking.
Cylinder head, cylinder head gasket, or cylinder block are leaking.
What can cause excessive crankshaft bearing wear?
Lack of oil supply or pressure
Excessive oil supply
High engine temperature
Low engine speed
What can happen to bearings when they wear excessively?
They can block the crankshaft oil feed
They can increase oil pressure
They can reduce engine noise
They can improve fuel efficiency
What is the primary function of a cylinder head gasket?
To increase engine power
To maintain a gas and water tight seal between the head and block
To reduce engine noise
To improve fuel efficiency
What can happen if a head gasket fails?
Increase in fuel economy
Decrease in engine temperature
Allow water into the cylinder or oil jackets
Improve engine performance
What is the primary use of a block tester kit?
To detect combustion gases in the coolant system
To measure engine oil levels
To test battery voltage
To check tire pressure
What color does the test fluid change to if combustion gases are detected in the cooling system?
Red
Blue
Yellow
Green
What can a block tester kit help identify in an engine?
Low fuel levels
Faulty head gasket or fractured head/block
Worn-out brake pads
Dirty air filter
What is the purpose of the valve face and valve seat in an engine?
To create a gas tight seal to retain combustion pressures
To increase the engine's horsepower
To reduce the engine's weight
To improve fuel efficiency
What can be used to reclaim the seal of a valve seat?
Grinding paste
Oil lubricant
Water
Sandpaper
Which of the following is a method for diagnosing valve and valve seat issues?
Compression test
Fuel efficiency test
Weight test
Temperature test
What causes wear between the valve stem and guide?
The reciprocating movement of the valve
The rotation of the valve
The expansion of the valve
The contraction of the valve
What is a sign that valve seals are wearing out?
Blue smoke emitted from the exhaust
Increased engine power
Decreased oil consumption
Clear exhaust emissions
What action should be taken if any signs of cambelt issues are diagnosed?
Ignore the signs
Replace the belt immediately
Reduce driving speed
Increase oil levels
What can occur on most engines if the cambelt fails?
Increased fuel efficiency
Piston to valve contact
Reduced engine noise
Improved engine performance
