Timing Chain Tensioner / Stretch
SeriousEngineThe N18 engine is better than the earlier N14, but the timing chain can still stretch or the tensioner fail, especially if oil changes were neglected.
Most affected: Cooper S, JCW
Typical symptoms
- •Cold-start rattle
- •Hesitation
- •Engine management light
What to inspect before you buy
- ✓Listen for metallic rattling from cold
- ✓Check oil level and service history
- ✓Look for evidence of chain replacement