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WorksheetsEngine pgs 85- 106
Total questions: 30
Worksheet time: 15mins
During an engine rebuild, which area of the cylinder block is most likely to be inspected for cracks?
Cylinder head
Crankshaft webs
Oil pan
Timing belt
What is the function of the piston in an engine?
To store oil
To compress expanding combustion pressures and move the crankshaft
To cool the engine
To inject fuel into the cylinder
The top of the piston, which is directly exposed to pressure and heat of combustion, is called the:
Skirt
Crown
Ring
Pin
What is the purpose of piston thrust faces?
To increase fuel efficiency
To reduce noise, scuffing, and piston slap
To inject oil into the cylinder
To control the timing of the engine
Why is it important to identify the thrust faces of a piston?
For proper fuel injection
For failure analysis
For cooling the engine
For increasing engine speed
How do turbocharged engines help cool the piston?
By using water jets on the piston crown
By using cooling jets that spray lubricating oil on the piston underside
By increasing the size of the piston
By reducing the compression ratio
How does the shape of the piston crown affect engine performance?
It determines the amount of oil used
It affects the fuel-air mixing and point of ignition
It controls the speed of the crankshaft
It increases the size of the cylinder block
What is the function of oil control rings in an engine?
To seal combustion gases
To manage the oil film on the cylinder wall and assist with sealing
To increase the number of compression rings
To transfer heat from the piston to the cylinder wall
Which of the following best describes a barrel faced piston ring?
It has a wedge shape to fit into a groove
Its outer face has a round radius like a barrel, with no sharp edge
It is used only for oil control
It has a straight and square cut
If an engine manufacturer wants to reduce the risk of carbon deposits in the piston ring groove, which ring design should they choose?
Square Cut Rectangular Ring
Barrel Faced Ring
Keystone Ring
Oil Control Ring
What is the primary function of the wrist (piston) pin in an engine?
To connect the crankshaft to the flywheel
To allow the piston to pivot in the cylinder and connect the piston with the connecting rod
To lubricate the engine bearings
To control the endplay of the crankshaft
What is the main role of the connecting rod in an engine?
To lubricate the crankshaft
To transmit power from the piston to the crankshaft
To control the endplay of the crankshaft
To support the main journals
Which of the following best describes the function of the crankshaft?
It converts the up-and-down movement of pistons to rotational movement
It supports the piston pin
It lubricates the connecting rod
It controls the engine temperature
What is the primary purpose of bearing retention in an engine?
To hold the bearing in place during installation
To increase engine speed
To reduce fuel consumption
To improve exhaust flow
What is the main function of a vibration damper or harmonic balancer in an engine?
To reduce torsional and harmonic vibrations
To increase engine horsepower
To cool the engine oil
To lubricate the crankshaft
How does a viscous or fluid damper reduce torsional and harmonic vibrations?
By shearing silicone fluid between the inertia ring and outer case
By increasing the crankshaft speed
By tightening the bearing caps
By injecting fuel into the crankshaft
Why is it important for the elastomeric dampener to be tuned to vibrate out of phase with the lowest torsional frequency of the engine?
To effectively reduce torsional vibrations
To increase engine temperature
To improve fuel injection timing
To decrease oil pressure
Explain how the back and forth movement between the inertia ring and outer case in a viscous damper converts vibration into heat energy.
The shearing of silicone fluid between the inertia ring and outer case converts the relative motion into heat energy, which damps torsional and harmonic vibrations.
The movement increases the air pressure inside the damper, causing heat.
The movement causes friction between metal parts, generating heat.
The movement compresses a spring, which releases heat.
Which tool is used to inspect the crankshaft bearing webs for cracks during cylinder block inspection?
Straightedge
Magnaflux™ or dye check methods
Feeler gauge
Oil gallery plug
Why should the cylinder block be stripped of all coolant plugs and oil gallery plugs before inspection?
To prevent oil leaks
To prevent dirt from being stuck into them
To increase engine power
To reduce engine noise
After cleaning, what should be done to the block to prevent rust?
Coat with a solvent
Coat with oil
Leave it to air dry
Paint it
What is the main reason for using MagnaFlux or dye kits during block inspection?
To measure oil pressure
To check for cracks in the block
To clean the block
To remove gasket material
Why is it important to keep all main bearing caps in order during engine block service?
To prevent oil leaks
To ensure correct reassembly
To reduce engine noise
To increase engine power
What is the recommended cross hatch pattern angle in the bore after honing/deglazing a cylinder block?
30-40 degrees
50-60 degrees
70-80 degrees
10-20 degrees
What tool is used to check the crankshaft runout?
Micrometer
Dial indicator
Torque wrench
Feeler gauge
What is the purpose of using Plastigage™ during crankshaft and bearing clearance checks?
To lubricate the bearings
To check the bearing clearance
To clean the crankshaft
To mark the bearings
What is the first step in piston, connecting rod, and bearing removal?
Remove the crankshaft
Remove the bolts from the connecting rod
Remove the cylinder head
Remove the oil pan
What should be done with replacement connecting rods and caps if they are not marked?
Discard them
Mark them after installation
Use them without marking
Paint them a different color
Which tool is recommended for cleaning piston ring grooves?
Ring groove cleaning tool
Screwdriver
Toothbrush
File
How do you determine the piston to bore clearance?
Subtract the piston outside diameter from the bore diameter
Add the piston outside diameter to the bore diameter
Multiply the piston and bore diameters
Divide the bore diameter by the piston diameter
