Choosing A Clutch Flywheel
A clutch flywheel must match the engine's crankshaft mounting and the transmission and clutch fitted to the vehicle. Compare the mounting pattern, friction surface and ring-gear specification with the intended application. A matching bolt count alone does not establish the complete fit.
A-Premium offers solid clutch flywheels for selected vehicles. Their diameters and ring-gear tooth counts differ by application, so choose the part specified for the engine and transmission combination.
What An Engine Flywheel Does
The flywheel rotates with the crankshaft and stores rotational energy, helping the engine turn through changes in the force produced by its cylinders. In a manual-clutch arrangement, it also provides a friction surface for the clutch disc.
The starter pinion engages the flywheel's ring gear to turn the engine during starting. The correct ring gear must match the starter and the engine application.
Flywheel Condition And Clutch Service
Heat damage, cracks or an uneven friction surface can affect clutch engagement. Inspect the flywheel when the clutch is being serviced, along with the clutch disc and pressure plate. A vibration or slipping complaint can involve more than one component.
Flywheel designs differ. A dual-mass unit has internal damping components, while a solid flywheel is constructed differently. Follow the service limits and handling instructions for the installed design.
Frequently Asked Questions (FAQ)
Does every clutch replacement require a new flywheel?
The flywheel should be inspected while the clutch is accessible, but replacement depends on its condition and the service limits for that design. Cracks, excessive heat damage or other out-of-specification wear can change the repair scope.
Can every flywheel friction surface be resurfaced?
Resurfacing is permitted only where the manufacturer specifies a method and limits for that flywheel. Some dual-mass flywheels must not have their friction surface machined. Identify the design before deciding how to service it.
Does a flywheel come with the clutch pressure plate?
A flywheel and a clutch pressure plate are separate components. Some repair packages combine parts, but an individual flywheel listing should not be assumed to include the clutch assembly. Check the package contents before ordering.
Is a clutch flywheel the same as an automatic transmission flexplate?
They serve different transmission arrangements. A manual-clutch flywheel provides a clutch friction surface, while a flexplate connects the engine to an automatic transmission's torque converter. Select the part required by the installed transmission.
Does grinding during starting always mean the flywheel is bad?
Starting noise can involve the starter pinion, its engagement or the flywheel ring gear. Inspect the related parts to identify damaged teeth or an engagement problem rather than replacing the flywheel from the sound alone.
