Timing systems are one of the most critical parts of your engine and one of the most misunderstood. Whether your vehicle has a timing belt or chain can have a profound impact on your maintenance schedule and repair costs. In this blog, we will break down the differences and point out what to look for in popular models of BMWs, Mercedes-Benzes, Audis, and more.
What is a Timing Belt?
A timing belt is a toothed rubber belt which links the crankshaft to the camshaft(s) which are part of the valvetrain. This ensures that the valves open at the right time and close at the right time in the engine for combustion to take place in such a way that complements the engines timing with respect to TDC or Top Dead Center.
- Usually reinforced, rubber
- Regularly replaced interval (usually 100,000 km)
- Less noisy
Common Euro Models with Timing Belts:
- Audi A4 2.0T (EA113/EA888 Gen 1)
- Volkswagen Golf 1.8T / TDI (older models)
- Porsche Cayenne V6 (early years)
What is a Timing Chain?
A timing chain is a storage device made of steel that performs a function much like a chain on a bicycle. It is lubricated by engine oil and is designed to last throughout the life of the engine, but that does not mean it will.
- Last longer, more durable than belts
- Thought to be more sensitive to oil quality and servicing
- Noisy when they wear
Common Euro Models with Timing Chains:
- BMW N20 / N26 / B48 / B58 engines
- Mercedes M270, M274, M276 engines
- Audi EA888 Gen 2/3/4 engines
- Porsche Macan 2.0T and V6s
Why Timing Components Fail?
Although timing chains are sold as “lifetime,” they still fail – which is, in many cases, due to oil-related neglect or design deficiencies.
Common Causes of Failure:
- Worn chain guides or tensioners
- Poor quality oil and longer-than-recommended service intervals
- Belt cracking or skipping due to age or heat
- Engine sludge contaminating chain driven systems
Signs of Warnings:
- Rattle on cold starts
- Check engine light (timing correlation codes)
- Loss of power or rough idle
- Metal particles in oil filter
What if you don’t do anything about it?
On interference engines (which is on most Euro cars), if the timing belt or chain fails, the pistons can hit the valves – which can cause catastrophic engine damage.
Repairing a timing chain failure can run $3,000 – $7000+ and this varies due to the vehicle (not all timing belt systems are equal) and potentially, the extent of internal damage.
Preventative Tips for Longevity
- Change your oil every 8000 km with high-quality synthetic oil
- Use OE or OEM filters and components
- Be aware of certain engine noises, especially during startup
- Never ignore fault codes P0016 or P0017
Why Amayak Auto Service?
We specialize in diagnosing and repairing engine timing systems in European cars like BMWs, Mercedes, Audis, Porsches, Volkswagens, Bentleys, and Ferraris. Whether you need a complete timing chain service done or a preventative inspection, we are here for you. We will use OE parts or factory procedures to protect your investment.
NOTE: Reserve to book your timing inspection today 📞. It could save you thousands.
