Cylinder Head Components CDX Flashcards
Technician A says multiple springs per valve may be used in engines designed to run at high rpm. Technician B says that the more pressure the valve springs have, the less wear will occur on the other valve train components. Who is correct?
Technician A
The engine installed in a race car would have _______ intake and exhaust ports than an engine designed for low operating speeds.
larger
Hardened valve seats are often used for both intake and exhaust ports to accommodate:
extreme temperatures.
When discussing valve train components, Technician A says stamped rocker arms are very strong and may be used in high-horsepower engines. Technician B says forged rocker arms are used in high-torque, high-horsepower applications. Who is correct?
Technician B
The main benefit of using roller rocker arms in the valve train is:
reduced friction and wear.
What is flame propagation?
The movement of the flame front away from the spark plug across the combustion chamber
When discussing intake and exhaust port designs, Technician A says larger ports will increase an engine’s torque at low engine speeds. Technician B says larger ports will increase torque at high engine speeds. Who is correct?
Technician B
During a cylinder leakage test, air leaks into the cooling system (out of the radiator filler neck). What should the next step be?
Remove the head and inspect it and the head gasket for leaks.
Technician A says all parts removed from a cylinder head should be placed on a disassembly board or laid out carefully so the location they were removed from can be identified. Technician B says it is important to reassemble parts in their original locations so wear patterns will match. Who is correct?
Both Technician A and Technician B
When removing a cylinder head, the first step is to:
research the removal procedure.
To determine if valve springs can be reused, they should be tested for spring height, installed pressure, and:
squareness.
Technician A says using roller rocker arms will reduce wear and friction in the valve train. Technician B says using roller rocker arms will increase fuel economy and performance. Who is correct?
Both Technician A and Technician B
What is the purpose of multivalve, hemispherical chamber cylinder heads (3 or 4 valves per cylinder)?
To increase the engine’s power and efficiency
Technician A says that valve stem seals allow a small amount of oil to seep past them in order to lubricate the valve stems. Technician B says that no oil should seep past properly functioning valve stem seals. Who is correct?
Technician A
Which of the following problems can be caused by worn valve guides?
All of the answers listed
What is flame propagation?
The movement of the flame front away from the spark plug across the combustion chamber
The engine installed in a race car would have _______ intake and exhaust ports than an engine designed for low operating speeds.
larger
The wedge combustion chamber:
lowers hydrocarbon emissions.
has the spark plug placed at the thick end of the wedge.
has a small combustion chamber surface area.
All of the answers listed
Two technicians are discussing a cracked cast iron head. Technician A says that some cracks can be welded successfully. Technician B says that some cracks can be repaired by pinning them. Who is correct?
Both Technician A and Technician B
Which of the following should you be aware of when removing a cylinder head?
Some manufacturers require the head bolts to be loosened in a specified pattern.
During a cylinder leakage test, air leaks into the cooling system (out of the radiator filler neck). What should the next step be?
Remove the head and inspect it and the head gasket for leaks.
When removing a cylinder head, the first step is to:
research the removal procedure.
To begin cylinder head component reassembly, Technician A says valve stems should be coated with clean engine oil or engine assembly lubricant before installing the valves. Technician B says only the valve stem seals need to be lubricated for reassembly. Who is correct?
Technician A
Technician A says all parts removed from a cylinder head should be placed on a disassembly board or laid out carefully so the location they were removed from can be identified. Technician B says it is important to reassemble parts in their original locations so wear patterns will match. Who is correct?
Both Technician A and Technician B
To determine if valve springs can be reused, they should be tested for spring height, installed pressure, and:
squareness.
Technician A says generally, sodium-filled valves cannot be repaired or ground and must be replaced if problems occur. Technician B says sodium filled valves have a hollow stem where the sodium is located. Who is correct?
Both Technician A and Technician B
Which of the following problems can be caused by worn valve guides?
Excessive engine oil consumption
Exhaust smoke
Premature wear on the valve face, seat, and stem
All of the answers listed
What is the purpose of multivalve, hemispherical chamber cylinder heads (3 or 4 valves per cylinder)?
To increase the engine’s power and efficiency
The main benefit of using roller rocker arms in the valve train is:
reduced friction and wear.
Which of the following tools should be used to measure valve clearance (lash) with solid valve lifters?
Feeler gauge
In an L-head (flat head) engine design, where are the valves located?
In the block, off to one side of the cylinder
Hardened valve seats are often used for both intake and exhaust ports to accommodate:
extreme temperatures.
The maximum allowed warpage of the cylinder head gasket surface is typically:
0.003″ (0.0762 mm).
Technician A says a cylinder head made of aluminum alloy cannot be checked for cracks with the Magna-Flux process. Technician B says the aluminum head can be dye tested for cracks and pressure checked for leaks. Who is correct?
Both Technician A and Technician B
Technician A says pushrods can best be checked for straightness by rolling them across a very flat surface such as a piece of glass. Technician B says rocker arms must be checked for wear at their valve end, pushrod end, and pivot area. Who is correct?
Both Technician A and Technician B
When deciding whether to reuse valve springs, Technician A says a valve spring is sure to have correct pressure if it passes the height and squareness tests. Technician B says a valve spring that is not square can cause premature wear to the guide and stem. Who is correct?
Technician B
