Timing belt kit
Here you will find useful basic information and handy tips for replacing the toothed belt in vehicles.
Important safety information
The following technical information and practical tips have been compiled by HELLA in order to provide professional support to vehicle workshops in their day-to-day work. The information provided on this website is intended for use by suitably qualified personnel only.
During replacement of the toothed belt, all belt drive components should be replaced, too. For this, Behr Hella Service provides complete kits incl. coolant pump, toothed belt, as well as any tensioner pulleys, deflection rollers, guide pulleys, shock absorbers, and seals required. Through this, the time-consuming search for individual components is not necessary.
Completely replacing all components provides the best possible protection against subsequent repairs and warranty claims. All parts are perfectly coordinated with each other and meet the high Behr Hella Service quality demands.
The toothed belt, also called the timing belt, is a drive belt with toothing. It drives the toothed pulley of the crankshaft and camshaft in an interlocking way, and is responsible for adherence to the valve timing.
For many vehicles the coolant pump and other ancillary units are also driven via a toothed belt. Different tensioner pulleys and guide pulleys are responsible for the tensioning and guiding of the belt. The actual power transfer of the belt is realised by an embedded tensile belt which is generally composed of aramid or glass fibres. To protect the teeth, which are made of elastomer, against wear, the inside of the belt is made of a wear-resistant textile.
For special forms, teeth are affixed to both the inside as well as outside of the belt.
The belt must be replaced in intervals specified by the vehicle manufacturer. If the replacement intervals or installation instructions are not complied with, there is the risk of damage to components and the engine.
When replacing the toothed belt kit, the specifications on the product instruction leaflet and the installation instructions of the vehicle manufacturer must be noted. The required special tools should also be used for correct assembly.
During replacement of the toothed belt, pay attention to the functional capability and the state of any alternator freewheel clutch (Figure 5, item A) and torsional vibration damper (Figure 6) installed. Furthermore, the components of the power take-off should also be checked (flat belt with tensioner pulleys and rollers, tensioning element). If, during the replacement of the coolant pump, it becomes evident that the cooling system is contaminated, it should be flushed. The HELLA cooling system cleaner is suitable for this, for example. The cooling system should only be filled with a coolant which meets the specifications of the vehicle manufacturer. The system should be filled and bled in accordance with the specifications of the vehicle manufacturer.
Information on the use, specifications and change intervals of coolant can be found in the corresponding technical information on coolant.
Information on the correct installation of coolant pumps can also be found in the applicable technical information.
Once the work is complete attach the service sticker, which documents the replacement of the belt, in a visible place in the engine compartment and also document the toothed belt replacement in the vehicle service book.
Replacement of the toothed belt on the example of a VW Golf V with 1.6 litre petrol engine.