What is a timing chain
One of the most common engine failures is a stretched or jumped timing chain. A timing chain connects the camshaft and crankshaft. The timing chain ensures that inlet and outlet valves always open and close on time. Modern engines are lightweight. Therefore, every component is as sturdy as necessary. Single row chains reduce the weight of engines. However, they are more susceptible to stretching forces. This results in a few problems – a stretched, jumped or broken chain and consequently engine failure.
Stretched timing chain
A stretched timing chain usually starts to make hardly noticeable noises in the engine bay. With time, a timing chain gets longer and the noise will increase. Dependent on make and model you will hear these noises even inside the car. In this case we strongly recommend turning off the engine in order to avoid very expensive engine repairs. In the worst case a timing chain can jump or even break. Dependent on engine and service history, a timing chain should be replaced every 50K to 150K kilometres. The usage of non-manufacturer approved engine oils and -filters can reduce the life-span of the timing parts. In some cases gearwheels are worn and must be replaced as well.
Jumped timing chain
A stretched timing chain can even increase the wear of gearwheels. As a result of worn gearwheels, timing chain can jump which will lead to damages on pistons, piston rods and valves, as well as engine block and timing cover (see picture). Red areas mark the damaged parts.
How can Autohaus Dietler assist you?
Should we detect any noticeable engine noises during a scheduled service, we will contact you immediately to discuss further steps.
- Check basic position of camshaft and crankshaft using special timing adjustment tools.
- Visual check for stretched chain, worn gearwheels and damaged chain gliders.
- Prepare a repair cost estimate
- Book a repair appointment and order the parts
- Dependent on urgency, we will suggest appointment slots to you.
- We will order all parts that need to be replaced (genuine or OEM), as we do not recommend using third party parts.
- We will perform the repairs strictly according to manufacturer’s specifications.