Rear Main Seal
The rear main seal seals the crankshaft at the gearbox end of the engine.
What is Rear Main Seal?
It sits behind the flywheel. Replacing it requires removing the gearbox. It is often replaced during clutch work. Oil dripping from the gap between engine and gearbox can be the rear main seal, but also the oil pan or valve cover leaking down. Dye testing helps locate the source. Using the correct installation tool prevents damage to the new seal lip.
How it works
The seal lip runs on the crankshaft flange.
Why it matters for your car
Oil on the clutch can cause slipping. Small leaks are often monitored.
Other terms
- Centre Bore
- Cooling System Bleeding
- Driver Fatigue
- Engine Bearing (Plain Bearing)
- Engine Oil
- Final Drive
- Forward Collision Warning
- Four-Stroke Engine
- Ground Clearance
- Headlight Levelling (Headlight Range Control)
- MAP Sensor (Manifold Absolute Pressure)
- OAT Coolant (Organic Acid Technology)
- Oxygen Sensor Heater
- Rear Seat Reminder
- Seatbelt Load Limiter
- Semi-Slick Tyre
- Starter Solenoid
- Transponder Key
- Valve Spring
- Wheel Horsepower (WHP)