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What is a BMW Timing Chain?

Whilst many other manufacturers engine are synchronised by a timing belt, BMW rely on timing chains. It is a crucial part of the engine’s internal workings to deliver the power and smooth performance that BMW are known for. It is an essential component that ensures everything runs in perfect harmony. Timing chains are generally more durable than timing belts and last the lifetime of the engine, if the engine is maintained regularly. Unlike timing belts, timing chains do not have a set interval for replacement but may eventually need replacement due to wear and tear. Well maintained engines can go 150,000+ miles on timing chains.

Common Signs of Timing Chain Faults

Although timing chains are designed to last a lifetime, it doesn’t mean that they are immune to wear & tear. Overtime the chain can stretch and become loose. There are a few common signs that your timing chains may be worn.

• Rattling on start-up or acceleration – If your timing chain tensioners are starting to break up and the chain is getting loose, you will start to hear a rattle, especially on a cold start or at idle which will get worse over time.
• Misfire / rough idling – On some instances, customers feel their vehicle ‘shaking’ at idle. This could be the sign of a worn timing chain.
• Engine light / Reduced engine power – If your vehicle’s timing is out, the onboard computer may show an engine light on the dash and reduce the vehicles power to ‘limp mode’.
• Metal shavings – During an oil change, you may see small metal shavings where the chain has shredded.

Ignoring these signs can cause engine failure. If the timing chain snaps, especially while driving, it is more than likely that it will cause more damage. In this case it is more cost effective to replace the existing engine with a brand new or 2nd hand engine.

How to Prevent Timing Chain Faults

To help prevent timing chain faults, it is recommended that you have regular engine oil changes. BMWs rely on clean oil to lubricate the timing chain. Irregular oil changes or using the incorrect oils can cause timing chain components to break up.

You should also regularly monitor your vehicle for any engine noises, especially when your vehicle has high mileage or poor performance. If your engine sounds different to normal or you can hear a rattle, then it is best to get it checked.