164-Tooth Cast-Iron Flywheel & Needle Pilot Bearing
Rotational inertia reservoir, starter ring-gear interface, primary clutch friction surface, and transmission input-shaft support.
Role in the System
What This Assembly Is
Bolted to the rear flange of the crankshaft with six heavy bolts is the nodular cast-iron flywheel, encircled by a shrink-fit 164-tooth steel starter ring gear and housing the caged needle-roller pilot bearing in its center bore.
Mechanics & Physics
How the Subcomponents Work Together
Smoothing Firing Pulses & Absorbing Launch Heat: The heavy cast-iron disc stores kinetic energy to keep the crankshaft turning smoothly between cylinder firings at low idle, and acts as a massive thermal heat sink on its machined rear face when you slip the clutch to get a loaded truck moving up a grade.
The Tiny Bearing That Saves the Transmission: Pressed into the center of the crankshaft flange is a 16-roller caged needle pilot bearing with an integral lip seal. It supports the tip of the transmission input shaft so the input shaft and crankshaft stay perfectly concentric even when spinning at different speeds.
Other Assemblies in This System
Diaphragm-Spring Clutch Pressure Plate & Cover
18-finger Belleville cone spring and nodular iron pressure ring that clamp the clutch disc with over a ton of force.
11-Inch Torsional-Damper Clutch Driven Disc
Waved Marcel cushion springs for silky engagement and coaxial coil dampers that filter engine firing spikes.
Concentric Slave Cylinder (CSC), Release Bearing & Quill
Coaxial annular hydraulic actuator that slides directly around the transmission input quill—eliminating external release forks.
Clutch Pedal, Firewall Master Cylinder & Safety Switch
Driver pedal leverage, hydraulic pressure generation, and the starter-interlock safety switch.