Collapsed hydraulic valve lifters in a...

Collapsed hydraulic valve lifters in a...

Question 1 of 270705eccefa1bacbc34ba4d476be

Collapsed hydraulic valve lifters in a diesel engine will result in __________.

Question 1 of 27070

Q

Collapsed hydraulic valve lifters in a diesel engine will result in __________.

🔍 Key Concepts

• how a hydraulic valve lifter maintains zero (or very small) valve clearance • what happens to valve lash (clearance) if the lifter can no longer keep oil pressure • the relationship between rocker arm motion, valve stem, and pushrod when parts shorten or lengthen

💭 Think About

• Think about what the hydraulic lifter normally does to the space between the rocker arm and the valve tip when it is full of oil and working correctly. • If the lifter "collapses," does it effectively become shorter or longer, and how would that change the clearance at the valve? • Which of the choices describes a condition you would expect if the pushrod side is now effectively shorter than it should be?

✅ Before You Answer

• Decide whether a collapsed lifter makes the valve train geometry effectively shorter or longer. • Picture where valve clearance (valve lash) is actually measured and how that gap would change if the lifter cannot pump up with oil. • Eliminate any options that describe problems in parts that are not directly controlled by the lifter (for example, parts on the valve spring side rather than the pushrod/lifter side).