Yes, a flywheel does need to be torqued to the manufacturer's specifications when it is installed in an engine. The flywheel is typically bolted to the engine's crankshaft using a set of bolts or studs. These bolts need to be tightened to a specific torque value in order to ensure that the flywheel is properly secured to the crankshaft. If the flywheel is not torqued to the correct specifications, it can cause a range of issues such as engine vibration, excessive wear on the flywheel or crankshaft, and even engine damage.