What is crankshaft rear seal/rear main oil leak repair?
A leaking rear main seal is replaced to stop oil dripping between the engine and gearbox.
The rear main seal sits at the back of the crankshaft. Replacing it means removing the gearbox, so it is often done with a clutch replacement.
Signs you need it
- Oil dripping between engine and gearbox
- Oil on the clutch
- Low oil level
How it works
- Confirm the leak source
- Remove the gearbox
- Replace the seal
- Reassemble and test
This service is carried out at a workshop.
How much does it cost?
The exact price depends on your vehicle and the job. On MYLES, each professional shows a fixed price, a starting price, a range, or sends a quote — so you can compare like for like before you book.
- Labour to remove the gearbox
- Clutch replacement at the same time
Tips
- Combine with a clutch replacement if due
- Monitor oil level until repaired
Why it matters
Recommended to prevent oil loss and clutch damage.