The timing belt transmits the power of the crankshaft to the camshaft. The camshaft in turn rotates half as fast as the crankshaft and opens or closes the intake and exhaust valves at the right moment. This synchronous process ensures a perfect combustion process in the engine and prevents serious engine damage. In some vehicles, a timing chain is used as an alternative to the timing belt. It is more resilient than the timing belt and is usually only installed in high-performance engines because it is more expensive to buy and replace.
The timing belt therefore has the following advantages over a timing chain:
In many vehicles, the timing belt also has the additional task of driving the water pump.
The timing belt is usually made of polymer and is additionally reinforced on the inside with glass fibre or nylon. However, it is subject to constant stress due to the high temperatures of the motor, tension, bending and friction. Therefore, the belt must be examined and visually inspected at every inspection, because damage or wear can easily be detected from the outside in the form of cracks. The tension of the belt must also be checked. In case of low mileage, the aging process of the material should not be forgotten either. If the timing belt tears despite regular checks, the vehicle must not be moved on under any circumstances, but must be towed directly to the workshop. In such a case the engine must also be switched off directly.
Even if it shows no signs of wear, the timing belt should still be replaced every few years. The replacement interval depends strongly on the vehicle model. You will find your vehicle manufacturer's instructions for changing the timing belt in the operating instructions or in the documents of your vehicle.
In general, it makes sense to replace the ancillary components belonging to the belt drive at the same time. These include the tension and idler pulleys, which ensure the correct tension and precise running, but also the water pump. The old water pump installed in the vehicle water pump - if it is driven by the timing belt - has in fact run in on the timing belt over time and could jam with a new drive train. In addition, changing the water pump is only a small position when changing the timing belt and is hardly of importance. However, the situation is different if the water pump breaks down between the intervals for changing the timing belt. In this case, the timing belt must be replaced at the same time and high repair costs would be the result. Therefore, the water pump must be replaced at the same time as the timing belt is changed and, for a small surcharge, it can be left in peace until the next change. To make it even easier for you, we also offer you the relevant components as carefully assembled toothed belt kits, which we have specially tailored to each vehicle.
Changing a toothed belt requires some experience in changing spare parts and requires more time. Depending on the vehicle and engine, the timing belt can also be difficult to access, which can cause the repair times to vary greatly and sometimes requires special tools. If this is too much effort for you, you can also leave the replacement of the timing belt to a workshop.
If you are not sure which toothed belt and which additional components of the belt drive are suitable for your vehicle, please contact our customer service with the 17-digit chassis number.