When a hydraulic valve lifter is on the base...

When a hydraulic valve lifter is on the base...

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Question 1 of 205eccefa1bacbc34ba4d476b7

When a hydraulic valve lifter is on the base circle of the cam, 'zero' valve lash is maintained by the __________.

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When a hydraulic valve lifter is on the base circle of the cam, 'zero' valve lash is maintained by the __________.

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🔍 Key Concepts

• Function of a hydraulic valve lifter in maintaining zero lash • Difference between a mechanical (solid) lifter and a hydraulic lifter • Role of internal components (springs vs oil) inside the lifter body

💭 Think About

• Which part actually compensates for expansion and wear to keep no clearance when the cam is on the base circle? • Does the outside valve train component (spring or rocker arm) control lash, or does something inside the hydraulic lifter do it? • How does engine oil interact with the internal spring in a hydraulic lifter?

✅ Before You Answer

• Identify which part is inside the hydraulic lifter body and directly pushes the pushrod when filled with oil • Decide whether oil pressure alone or a spring-loaded internal part assisted by oil keeps the system tight • Confirm that the valve spring and rocker arm mainly transmit motion, rather than automatically adjust lash

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