Mini Cooper S (R56) Timing Chain: Why It Rattles and How to Replace It
A loud, diesel-tractor-like rattle on a cold start that fades as the engine warms up is the Mini community's infamous “death rattle” — and on the R56-era turbocharged engine, it was significant enough to trigger a US class-action settlement (Skeen v. BMW) extending timing chain warranty cover to 7 years/100,000 miles. If you're hearing it, this is not a noise to put off dealing with.
Which engines are affected
| Engine | Years | Risk level |
|---|---|---|
| N14 (turbo, Cooper S / JCW) | 2007–2010 | High — the engine this issue is most associated with |
| N18 (turbo, facelift Cooper S) | 2010/2011–2013 | Much lower — revised tensioner and oil pump drive |
| N12/N16 (non-turbo base Cooper) | 2007–2013 | Low |
If your Cooper S is a pre-facelift car (2007–2010), you're in the highest-risk group. The facelift N18 revised the tensioner and oil pump drive specifically to address this, and is far less affected, as are the non-turbo base Cooper engines.
Why it happens
The factory tensioner on the N14 is inherently weak for the loads a turbocharged engine puts through the timing chain. As it wears, the chain gets enough slack to rattle against its plastic guides — loudest cold, quietening as oil pressure builds and takes up some of the slack. Left long enough, the chain can jump time on this interference engine, which means the pistons and valves can collide.
Parts and part numbers
Confirmed via ECS Tuning's genuine-parts listing: the timing chain itself is 11318618317 (covers R55/R56/R57 Cooper S, JCW and JCW Clubman). Cam sprocket bolts (11367545863 / 11367536087) were found via a specialist supplier's own listing but we couldn't independently cross-confirm them against a second source. The crank bolt and tensioner part numbers could not be confirmed to a single universal number — check against your VIN at a parts counter.
Torque specifications
| Fastener | Torque |
|---|---|
| Crank bolt | 50 Nm + 180° |
| Cam sprocket bolts | 20 Nm + 90–180° |
| Valve cover bolts | 10 Nm |
| Tensioner bolt | 80 Nm (two-source majority — a third source says 65 Nm; the discrepancy isn't resolved) |
The tensioner bolt figure is the one genuine inconsistency we found across our sources — we've used 80 Nm as the majority figure, but if your own manual or TIS data gives 65 Nm, trust that over this article.
A second angle on the same job:
Safety first
This is a timing-critical job on an interference engine. Use the correct crank and camshaft locking tools throughout, and never turn the engine over by hand once the chain is disturbed until you've confirmed everything is back in time.
Tools & parts required
- Crankshaft and camshaft locking tools (N14/N18-specific)
- Socket set, ratchet and torque wrench with an angle gauge
- New timing chain kit (chain, tensioner, guides)
- Fresh engine oil and filter
- Timing cover gasket or sealant
Removing the old chain
- Set the engine to top-dead-centre on cylinder 1 and fit the crank and camshaft locking tools.
- Remove the ancillary components blocking access to the timing cover for your variant.
- Remove the timing cover, release the tensioner and lift off the old chain, guides and sprockets.
- Inspect the guides closely for wear — on a high-risk pre-facelift engine, don't be surprised to find them badly chewed up.
Fitting the new chain
- Fit the new guides and sprockets, double-checking the crank and cam locking tools are still correctly seated.
- Fit the new chain with the timing marks aligned exactly as your manual specifies, confirming before you fit the new tensioner.
- Fit the new tensioner and torque the sprocket bolts to the figures above.
- Refit the timing cover with fresh sealant/gasket and refit the ancillary components.
- Remove the locking tools once everything is torqued, then rotate the engine by hand through two full turns to confirm it stays in time before starting it.
Final checks and road test
Change the oil and filter, then listen through several cold starts over the following days — the rattle should be completely gone. Clear any stored fault codes and confirm none return after a proper drive.
Troubleshooting & tips
- Rattle persists. Check oil level and condition first — a fresh tensioner still needs proper oil pressure to work correctly.
- Engine won't start cleanly. Stop and recheck the timing marks rather than repeatedly cranking it.
- Fault codes return. Camshaft/crankshaft correlation codes usually mean the timing is out by a tooth and needs rechecking properly.
Given the class-action history behind this fault, it's worth having a specialist verify your timing marks if you're at all unsure about this job. For other Mini engine jobs, see our guide to the Mini Countryman N18 timing chain.