What is the primary function of valve stem seals in modern engines?

What is the primary function of valve stem

Multiple choice — select the best answer

ATo seal the valve seat to the cylinder head
BTo increase the pressure in the combustion chamber
CTo control the amount of oil entering the valve guides
DTo adjust the valve timing

✓ Correct answer: C. To control the amount of oil entering the valve guides Valve stem seals are crucial in regulating the amount of oil that lubricates the valve stems as they move within the valve guides. This ensures minimal oil consumption and reduces emissions from burning excess oil.

.q-expl{display:block!important}.q-opt[data-idx="2"]{border-color:#16a34a;background:#f0fdf4}.q-opt[data-idx="2"] .oltr{background:#16a34a;color:#fff}.q-opt{cursor:default!important;pointer-events:none}

Keep practising. Use the free ASE Auto Test Prep PDF, watch the YouTube walkthrough, or unlock all 10 web questions with timed mock exams.

Free PDF Video walkthrough

← Previous 🎲 Random question ↩ Back to all questions

Keep practising

What is the primary function of valve stem seals in modern engines?

Related questions

Free practice here. Timed mocks when you are ready.