WorksheetsObjectives of Four-Stroke Engine Study
Total questions: 65
Worksheet time: 38mins
Which of the following is a component of a four-stroke engine?
Piston
Battery
Radiator
Spark plug
Fill in the blank: One of the components of a four-stroke engine is the _________.
piston rings
spark plug wire
radiator cap
fuel gauge
Which of the following is also known as a wrist pin in a four-stroke engine?
Crankshaft
Piston pin
Camshaft
Valve
Fill in the blank: The ________ connects the piston to the crankshaft in a four-stroke engine.
connecting rod
camshaft
valve spring
spark plug
Which of the following is responsible for converting the reciprocating motion of the piston into rotational motion in a four-stroke engine?
Camshaft
Crankshaft
Valve
Lifter
Fill in the blank: The ________ is a component of a four-stroke engine that controls the opening and closing of the valves.
camshaft
crankshaft
piston
spark plug
Which of the following is a component of a four-stroke engine?
Alternator
Lifters
Carburetor
Radiator
Fill in the blank: The ________ are components in a four-stroke engine that allow air and fuel to enter and exit the combustion chamber.
valves
pistons
crankshafts
spark plugs
Look at the diagram of the Four-Stroke Engine. What is the name of part number 1?
Piston
Crankshaft
Spark Plug
Camshaft
Look at the diagram of the Four-Stroke Engine. What is the name of part number 2?
Piston Rings
Crankshaft
Spark Plug
Connecting Rod
Look at the diagram of the Four-Stroke Engine. What is the name of part number 3?
Wrist Pin/Piston Pin
Crankshaft
Connecting Rod
Cylinder Head
What is the name of part number 5?
Connecting Rod
Crankshaft
Piston Pin
Camshaft
What is the name of part number 4?
Wrist Pin/Piston Pin Retaining Clip
Connecting Rod
Crankshaft
Cylinder Head
Look at the diagram of the Four-Stroke Engine. What is the name of part number 6?
Crankshaft
Piston
Camshaft
Spark Plug
What is the name of part number 7?
Connecting Rod Cap
Piston Pin
Crankshaft Pulley
Cylinder Head
What is the name of the part labeled with number 8?
Oil Dipper
Crankshaft
Piston
Camshaft
What is the name of the part labeled with number 9?
Camshaft
Crankshaft
Piston
Valve
What is the name of the part labeled with number 10?
Lifters
Camshaft
Push Rods
Rocker Arms
What is the name of the part labeled with number 11?
Pushrods
Camshaft
Rocker Arms
Valves
What is the name of the part labeled with number 12?
Rocker Arms
Camshaft
Piston
Crankshaft
What is the name of the part labeled with number 13?
Valve Springs
Camshaft
Piston
Crankshaft
What is the name of the part labeled with number 14?
Valves
Pistons
Cylinders
Crankshaft
Fill in the blank: The piston travels within the bore of the ________.
cylinder
crankshaft
valve
camshaft
Fill in the blank: The piston transfers combustion energy to the ________.
crankshaft
radiator
spark plug
fuel injector
Four-Stroke Fact: The cylinder wall and the piston expand at different rates, so enough ________ must be provided between them. Fill in the blank.
clearance
lubricant
pressure
friction
Where are piston rings installed to form a seal?
On the crankshaft
On the piston to form a seal between the piston and the cylinder wall
On the cylinder head
On the connecting rod
Piston rings are typically made of _________.
high-grade cast iron and steel
aluminum
plastic
copper
Which of the following is NOT a function of piston rings?
A) Provide a seal to hold the combustion pressure in
B) Retain as much oil as possible in the crankcase
C) Transfer heat from the piston to the cylinder walls
D) Increase fuel consumption
One function of piston rings is to provide a seal to hold the ________ pressure in.
combustion
hydraulic
vacuum
coolant
Piston rings help transfer heat from the piston to the cylinder walls.
True
False
Fill in the blank: One common type of piston ring is the ________ ring.
compression
ignition
timing
valve
Fill in the blank: One common type of piston ring is the ________/wiper ring.
scraper
compression
oil
expander
Fill in the blank: One common type of piston ring is the ________ control ring.
oil
fuel
air
water
Where is the compression ring installed on the piston?
The compression ring is installed in the top groove on the piston.
The compression ring is installed in the bottom groove on the piston.
The compression ring is installed on the piston skirt.
The compression ring is installed inside the piston pin bore.
What is the primary function of the compression ring in a cylinder? (Fill in the blank)
The compression ring provides the seal for the cylinder by expanding out against the cylinder wall.
The compression ring lubricates the cylinder wall to reduce friction.
The compression ring cools the cylinder by dissipating heat.
The compression ring supports the piston to prevent it from tilting.
What material is the compression ring typically made of?
Cast iron
Aluminum
Copper
Plastic
Where is the scraper/wiper ring located?
Between the compression ring and the oil ring
Above the compression ring
Below the piston pin
Inside the cylinder head
What is the function of the scraper/wiper ring?
Where is the oil control ring located in relation to the crankcase?
In the groove closest to the crankcase (toward the bottom)
In the groove farthest from the crankcase (toward the top)
Directly above the piston pin
Between the compression rings
What is the function of the oil control ring?
What does the wrist pin/piston pin attach to?
The crankshaft
The upper end of the connecting rod
The cylinder head
The camshaft
What function does the wrist pin/piston pin serve regarding the piston and connecting rod?
It allows the piston to pivot on the end of the connecting rod
It locks the piston in place
It connects the crankshaft to the piston
It seals the combustion chamber
The wrist pin/piston pin can be pressed in or held in place by a _______ at each end.
wrist pin retaining clip
valve spring
connecting rod bolt
camshaft gear
What does the connecting rod connect in an engine?
The piston to the crankshaft
The crankshaft to the camshaft
The piston to the cylinder head
The camshaft to the valves
The small end of the connecting rod is attached to the piston with the ________.
wrist pin
crankshaft
camshaft
valve
The large end of the connecting rod is usually split across the diameter of its opening to allow for assembly onto the ________.
crankshaft
camshaft
piston
valve
Four-Stroke Fact: The reciprocating movement of the piston in the cylinder is converted to the ________ movement of the crankshaft.
rotational
linear
oscillating
vibrational
What does the connecting rod connect in an engine?
The piston to the crankshaft
The camshaft to the flywheel
The spark plug to the cylinder head
The oil pump to the radiator
The connecting rod and its connecting rod cap are manufactured as a unit and must always be kept together.
True
False
What is the lower half of the large end of the connecting rod called?
The connecting rod cap
The piston pin
The crankshaft journal
The camshaft lobe
What does the crankshaft convert the reciprocating movement of the piston into?
A rotational movement
A linear movement
An oscillating movement
A vibrating movement
The crankshaft has a mechanical link, usually gears, to which of the following?
A) Camshaft and mechanical governor
B) Piston and cylinder
C) Fuel injector and spark plug
D) Radiator and fan
Four-Stroke Fact: The distance from the centerline of the crankshaft to the centerline of the connecting rod journal, multiplied by two, determines the (a) of the engine.
Fill in the blank: The camshaft is at (a) speed of the crankshaft, usually through direct gear contact.
Fill in the blank: The camshaft will have a ______ lobe to open each intake and exhaust valve.
teardrop
circular
square
rectangular
Fill in the blank: The camshaft determines the ______ when valves open and close in relation to each other.
timing
pressure
temperature
speed
What does the camshaft do?
Controls fuel injection
Determines the timing when valves open and close in relation to each other
Regulates engine temperature
Powers the alternator
What are lifters also known as?
Pushrods
Tappets
Rocker arms
Valves
Where are lifters located?
On the crankshaft
On the camshaft lobes
On the cylinder head
On the piston
As the camshaft rotates, the lifter follows the profile of the camshaft lobe and moves the ______ up and down to move the rocker arm.
pushrod
valve spring
crankshaft
timing belt
Lifters include two types: hydraulic and ______.
mechanical
electrical
pneumatic
magnetic
Which of the following are types of lifters?
Hydraulic and pneumatic
Mechanical and electrical
Hydraulic and mechanical
Pneumatic and electrical
Hydraulic lifters have multiple parts and are usually replaced as a ________.
unit
pair
set
piece
Through the use of a spring, inner and outer cylinders, and engine oil, the hydraulic lifter will be ________ free.
maintenance
trouble
oil
noise
Hydraulic lifters allow for constant contact between the cam, lifter, pushrod, rocker arm, and ________.
valve
crankshaft
piston
timing belt
