Chain tensioner failure is a common problem for the Generation 2 MINI R56 Cooper S, it is characterised by a loud rattle that is particularly prominent from startup/cold. The issue affects the N14 engine found in the MINI R56 Cooper S between 2007 and 2009, and JCW’s from 2008-2012.

The issue is often referred to as death rattle. The issue was resolved with the introduction of the N18 engine in the later MINI Cooper S/JCW/GP models.

The chain tensioner is inherently weak and has had several revisions from BMW over the years. A weak tensioner can cause your MINI to develop the dreaded cold start (death) rattle.

This is where the chain is not under the correct amount of tension and is free to rattle around against the plastic chain guides. The noise can be reminiscent of a diesel tractor on startup and does not sound particularly healthy.

The reason the noise is most audible on cold start is that the oil has not yet circulated around the engine. Once the engine oil pressure has built up and the oil has had a chance to circulate the engine, the oil acts as a damper and reduces the level of audible noise.

If your MINI has recently developed death rattle then the initial fix is to carry out an oil and filter change along with the latest tensioner from BMW. If this does not appear to fix the issue then the next step is to replace the chain and the guides. We stock death rattle fixes for MINI N14, MINI N18 and MINI N20 and provide an inhouse fitting service should you need any help.

The reason for this is that over time, due to the lack of tension, the chain stretches meaning that even when under the correct amount of tension, the cold start rattle can still be heard. Lohen has performed many timing chain swaps over the years and will be happy to quote you and your MINI.

If you’re concerned your R56 is suffering from death rattle, drop us a line on 01785 859999 or contact us here.