TECH · Jun 2, 2026 In a hydraulic valve lifter, a check valve allows engine oil to flow into the lifter's high-pressure chamber but prevents it from flowing back out when the camshaft lobe loads the lifter to open the engine valve. NOT BS
TECH · Jun 2, 2026 In a typical hydraulic valve lifter, the plunger automatically adjusts to eliminate clearance in the valvetrain. NOT BS