Question 40Motor Plants - 1st Asst/Chief

The correct answer is C) reduce valve gear pounding. Hydraulic valve lifters are used in diesel engines to reduce valve gear pounding and minimize engine noise. They work by using hydraulic pressure to take up any clearance (lash) in the valve train, which helps maintain a solid connection between the camshaft and the valve. This prevents the valve train components from slamming against each other, reducing the impact noise and wear on the engine. The other options are incorrect because hydraulic lifters are not primarily used to obtain greater valve lift (A), create longer valve duration (B), or increase valve operating lash (D). Their main function is to dampen the valve train movement and minimize the pounding that can occur in a diesel engine.