Under what circumstances would a hydraulic lifter fail?
What will be an ideal response?
Hydraulic lifters can fail for several reasons:
1. Dirt lodged in the check valve can allow the lifter to leak. Too much wear between the lifter and the body can cause excessive leak-down. This results in a noisy lifter.
2. A lifter might be noisy because of an oil pressure problem.
3. A lifter can become stuck if varnish accumulates between its plunger and body because of a lack of periodic oil changes.
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