WorksheetsEngines 2 week 4
Total questions: 10
Worksheet time: 5mins
Which statement best describes the role of the cylinder head assembly in an engine?
It acts as the end cap for the combustion chamber
It provides lubrication to the piston ring assembly
It cools intake air before turbocharger compression
It balances crankshaft rotation during engine operation
Compared with older port-injected heads, a Gas Direct Injection cylinder head primarily changes where the fuel and air are mixed. Where does this mixing occur in GDI designs, and what is one key benefit?
In the combustion chamber, improving fuel economy up to 35%
In the intake manifold, lowering octane requirements slightly
Before the throttle body, reducing spark plug wear significantly
Within the fuel rail, increasing injector lifespan moderately
A technician finds excessive valve stem wear on a head with an integral valve guide like the one shown. Which service approach is most appropriate?
Apply threadlocker and reseat the original valve guide
Heat the guide and shrink-fit an oversized bronze sleeve
Press out the guide and install a new removable insert
Replace or machine the entire cylinder head assembly
What is the primary function of a valve seat in a cylinder head?
Reduce piston to head clearance at TDC
Provide a sealing surface for a closed valve
Store oil near the valve spring retainer
Guide the valve stem during reciprocation
A cam card shows duration increased from 222° to 256° and lift from 0.440 to 0.500 on the intake. What change in engine behavior is most likely when correctly tuned?
Quicker closing with less overlap at speed
Stronger high‑rpm power with rougher idle
Reduced airflow with improved low‑rpm torque
Lower emissions with smoother idle
In a vane-type cam phaser, which outcome best describes moving from the fully retarded position to the fully advanced position as shown in the diagram?
Camshaft timing is advanced relative to sprocket rotation
Oil pressure to the check valve is reduced significantly
Camshaft timing is retarded relative to sprocket rotation
Valve lift is increased without changing cam timing
Which component in the vane-type cam phaser diagram primarily directs oil to change phaser position?
Spool valve controlled by PWM signal
Rocker shaft driven by ECM
Startup check valves only
Secondary rocker arm pins
In the dual-lobe system, when sliding lock pins are engaged, which cam profile operates the valve in the high-lift position?
Both cams operating separate valves
Camshaft directly without rocker arms
Low-speed cam through isolated followers
High-speed cam through linked followers
Which configuration shows a bucket style lifter positioned directly between the cam and the valve tip?
Lifter located in the engine block assembly
Lifter mounted within the cylinder head bore
Lifter acting between cam and valve tip
Lifter installed beside the rocker arm body
When checking cylinder head warpage, what is the correct basic procedure using common hand tools?
Place a ruler across the head and read the scale marks
Set a straightedge on the surface and use a feeler blade
Measure with a dial indicator mounted to the block
Torque the head to spec and observe gasket squeeze
