Oil leaking from the bellhousing (rear main seal)
Will get worse if left.
Symptoms
Oil dripping from the bottom of the bellhousing, clutch slip if oil reaches the friction plate.
Likely cause
Worn rear crankshaft seal. Early engines used a rope seal.
Suggested fixes
Listed roughly in the order most owners try them.
- 1
Replace the rear main seal
Gearbox removal is required. Fit a modern lip seal and inspect the clutch.
- Difficulty:
- Experienced DIY
- Cost:
- ££ (About £50 to £300)
- 2
Check engine breathers
Blocked breathers increase crankcase pressure and push oil past seals.
- Difficulty:
- Easy DIY
- Cost:
- £ (Under about £50 in parts)
This is general guidance gathered from owner experience and workshop practice, not a substitute for a workshop manual or a qualified mechanic. Costs are rough parts-only guides. Brakes, steering and suspension work affects safety, so if in doubt have it checked professionally.
Related faults
- EngineHigh severity
300Tdi timing belt walking off or failing early
Belt noise or rubbing behind the timing cover, belt fraying at the edge, sudden failure leaving the engine dead.
90 / 110 / 127 · Defender · 300Tdi3 fixes - EngineHigh severity
Oil wicking up the injector harness into the ECU
Oil found in the injector harness plug at the cylinder head, oil in the ECU connector, misfires, poor running or stalling.
Defender · Td53 fixes - EngineMedium severity
2.2 Puma DPF blocked or regeneration warnings
DPF warning light, loss of power, frequent fan running after switching off.
Defender · 2.2 Puma3 fixes - EngineMedium severity
2.5 Diesel Turbo (19J) smoking and low power
Blue or black smoke, low compression, oil consumption, knocking under load.
90 / 110 / 127 · 2.5 Diesel Turbo3 fixes