What is the primary purpose of using an impact wrench during engine disassembly?

Using an impact wrench during engine disassembly serves the primary purpose of efficiently removing stubborn or tightly secured fasteners, such as the 21-millimeter retaining nut on the flywheel. This tool is particularly effective because it delivers high torque in short bursts, which can loosen bolts that may be rusted, corroded, or simply too tight to remove by hand.

The flywheel retaining nut is essential for the engine's operation and often requires significant force to remove, making an impact wrench an ideal choice for this task. The rapid, pulsating action of the wrench helps prevent stripping of the fastener threads while minimizing the risk of damaging surrounding components.

While tightening bolts securely and achieving accurate torque are functions of various tools, they do not align with the primary purpose of disassembly. Similarly, disassembling a carburetor involves a different set of tools and techniques that are more suited to delicate components than to heavy-duty fastener removal.