Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is a sign that the oil supply passage to a hydraulic lifter on a diesel engine is plugged?

Excessive oil pressure
Noise from the affected valve
Increased fuel consumption
Engine overheating

The correct answer is: Noise from the affected valve

Noise from the affected valve is a clear indicator that the oil supply passage to a hydraulic lifter on a diesel engine may be plugged. Hydraulic lifters are designed to maintain zero clearance between the valve and its actuating mechanism, allowing for smooth operation. When the oil supply to these lifters is blocked, it can lead to a lack of hydraulic pressure, which causes the lifter to not function properly. This can result in a ticking or tapping noise from the affected valve as it fails to open or close completely due to insufficient lubrication and pressure. The noise serves as a direct signal that something is amiss with the valve actuation, particularly in engines equipped with hydraulic lifters that rely on oil to adjust valve timing and ensure proper operation. Observing this noise means that the lifter itself is likely not receiving the proper amount of oil due to a blockage, which can lead to further mechanical issues if not addressed.