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A flywheel is a heavy rotating disc bolted to the rear of the crankshaft that smooths out the power pulses from each cylinder firing, keeps the engine running between combustion events, and provides the ring gear that the starter motor engages on cranking. Browse our full flywheel range to find an exact-fit replacement for your vehicle by registration.
The flywheel stores kinetic energy during the power stroke and releases it steadily during the exhaust, intake, and compression strokes. This flywheel action is what allows a petrol or diesel engine to idle smoothly rather than lurching with every combustion event. On manual gearbox cars the flywheel also forms the friction surface that the clutch disc clamps against — so a scored or warped flywheel directly affects clutch engagement quality.
Dual-mass flywheels (DMF) add a spring-damper system between two plates to absorb drivetrain vibration. They are standard on many modern diesel vehicles and significantly reduce gearbox and transmission noise. A worn DMF typically causes a distinctive rattling noise at idle that changes pitch when the clutch is depressed.
Common warning signs include vibration through the clutch pedal, chattering or shuddering when pulling away, difficulty engaging gears smoothly, and an unusual scraping or knocking sound from the bellhousing. On dual-mass units a rattling noise at idle — sometimes described as a bag of bolts — is the most recognisable symptom.
If the ring gear teeth are damaged the starter motor may spin without catching, causing a grinding noise on start-up. This can also prevent the engine from starting at all if the damage is severe enough.
Flywheel replacement is typically done alongside a full clutch kit. Machining a flywheel is possible where a solid unit shows minor scoring, but dual-mass units are always replaced outright — they cannot be resurfaced. Always check that the replacement flywheel matches your engine code and gearbox type, not just the make and model, as different trim levels can use different flywheels on the same platform.
Use the registration lookup on any product page to confirm fitment. Delivery on qualifying orders is free across the UK when you spend over £99, and you have 14 days to return any part that does not fit.
Commonly searched OE numbers fitting Flywheel from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.