The McCormick 3547846M91 engine tappet, also known as a valve lifter, is a genuine OEM component critical for the precise operation of the engine's valvetrain. This high-quality part ensures accurate valve timing and contributes to the overall efficiency and longevity of the engine. It is compatible with a wide range of McCormick agricultural tractors, including models from the MC, MTX, and XTX series, as well as various Massey Ferguson and Valtra tractor models that share this common engine component.