They work similarly to other hoists, wrapping a cable around a drum wheel in order to lift vertically, but they have a specific design to aid in their task.
Engine hoists generally sit on two legs which lie flat on the ground. These legs reach out underneath the undercarriage of the vehicle and are attached to a vertical boom. A long arm reaches out from the top of the boom, over the hood of the car; this is where the fastening hook hangs. Most engine hoists use a metal chain line rather than rope or wire due to chains superior strength.
Engine hoists can be customized with several features to improve functionality. For example, some hoists have legs which can be folded to conserve storage space. Additionally, many hoists are equipped with wheel, so that engines can be more freely moved for removal or installation. Some models also have telescoping booms to work on a broader range of vehicles.
As one would expect, this type of hoist is most commonly used in the automotive industry. Automobile engines are incredibly heavy, and without a reliable method for lifting them, it would be nearly impossible to repair or replace these essential components. The same is true for the aerospace and heavy machinery industries. Engine hoists are the most practical and important component for any application that requires the removal or installation of engines or heavy mechanical parts.