This clutch seal ring sits in the clutch housing to retain transmission oil and prevent leakage past the rotating shaft. It seals the boundary between the stationary housing and the clutch input shaft, maintaining the correct oil level for the clutch pack and release bearing. A worn seal allows oil to escape, which can lead to clutch slip, engagement delay, or bearing failure from insufficient lubrication. Corteco manufactures this seal to match the original housing bore and shaft groove dimensions, so the sealing lip seats correctly without modification. On installation, inspect the shaft contact surface for scoring and lubricate the seal lip before pressing it into the housing.