HYUNDAI/KIA 4142124300 CYLINDER CLUTCH

The CYLINDER CLUTCH is the clutch release bearing — also termed the throw-out bearing — that transmits the axial load from the stationary clutch fork or concentric slave cylinder to the rotating diaphragm spring fingers of the pressure plate assembly, compressing the diaphragm spring to release the clamping force on the clutch disc and disengage the drivetrain from the engine during gear changes. The bearing consists of a deep-groove angular-contact ball bearing with a hardened steel thrust face on one side that contacts the diaphragm spring fingers and a mounting collar on the other side that slides on the transmission input shaft sleeve or clips onto the concentric slave cylinder piston. Unlike most vehicle bearings which operate intermittently under load, the release bearing on vehicles with a continuous-contact clutch pedal design rotates at engine speed at all times — it is permanently engaged against the diaphragm spring fingers with a light preload — and is therefore subject to continuous fatigue loading throughout the engine's running life. On vehicles with a touch-type or free-play clutch design the bearing contacts the diaphragm fingers only when the clutch pedal is depressed, giving it a lower duty cycle but subjecting it to higher intermittent loads at each engagement.

This unit — HYUNDAI/KIA 4142124300 — is manufactured to OEM-equivalent specifications: bearing dynamic load rating and static thrust capacity, thrust face outer diameter to match the diaphragm spring finger pattern, collar bore diameter and guide sleeve fit, overall axial height, and mounting clip or retainer geometry are matched to the original part. Supplied as a direct replacement for standard fitment. Available wholesale from 14.31 USD, MOQ 20 pcs, production lead time 10-45 days.

Release bearings fail through grease exhaustion from the bearing's sealed grease pack after high-mileage continuous rotation, raceway fatigue pitting from repeated high-load engagement cycles on vehicles used frequently in heavy traffic or with a driver habit of resting a foot on the clutch pedal under load, and collar guide wear from insufficient lubrication of the input shaft sleeve contact surface. The release bearing is only accessible after transmission removal — always replace it as part of every clutch service regardless of its apparent condition, as the incremental cost of the bearing is negligible relative to the labour cost of returning to replace it if it fails shortly after the clutch disc and pressure plate have been renewed.