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Best practice belt replacement

By autotech-nic on December 30, 2015

In order to provide their customers with the best possible service and cost effective repair, Dayco, the world’s largest original equipment (OE) timing belt manufacturer, is drawing attention to the opportunities presented by the front-end auxiliary drive (FEAD) system, particularly when the vehicle is in the workshop for a scheduled timing belt replacement.

The auxiliary belt in the modern vehicle comes under considerable load as it is required to drive numerous additional components such as the power steering pump and air conditioning compressor, alongside the familiar alternator and water pump duo. As a result, Dayco says best practice is to replace the auxiliary belt in line with the timing belt replacement schedule, as both components will cover the identical mileage.

The company also recommends that the other components in the FEAD system are rigorously checked at the same time and should any wear be detected in the tensioner, idler or crankshaft pulley, these too must be replaced to ensure a full and thorough system repair.

TVDs and tensioners

As engines are becoming lighter and more compact, effective vibration damping is evermore important to ensure the vehicle manufacturer’s required engine life and the comfort of the vehicle’s occupants.

Among the internal components of the FEAD system, one of the most important is the crankshaft pulley, which in these vehicles is referred to as a torsional vibration damper (TVD) and is designed with rubber internal components, capable of absorbing and damping the crankshaft vibrations, preventing them from reaching other parts of the system.

TVDs and tensioners perform a very important function for the correct and efficient operation of the transmission system. This function is reflected in the structural complexity of each of these components, the design and manufacture of which require significant commitment in terms of technical knowledge and research investment.

As well as being the world’s largest OE timing belt manufacturer, Dayco is a global leader in the research, design and manufacture of all related power transmission components, including tensioners and TVDs. Further, Dayco is one of the major four OE TVD suppliers in Europe and the only brand to also supply direct into the UK aftermarket. Its current range consists of more than 190 part numbers, which cater for the vast majority of vehicle applications.

Besides the ‘traditional’ TVD, Dayco also manufactures more complex versions called the double damping system (DDS) TVD, which is designed and fitted to more powerful and efficient units such as the Fiat Multijet 1.9/2.0 series of engines. These latest generation diesels are extremely efficient, but require a DDS TVD to operate effectively.

As can be imagined, TVD manufacture presents a number of significant technological difficulties from
the requirement to join and ‘merge’ rubber and metal components, to the formulation of specific compounds capable of reacting immediately to the intense vibrations transmitted through the system by these types of engines.

All Dayco components, whether destined for OE or aftermarket, are manufactured to the same standards, so workshops fitting Dayco can be assured of OE quality and pedigree across the range.




About Autotechnician
Autotechnician is a magazine published nine times a year, delivering essential information to independent garage owners and technicians in the UK. Delivered both digitally and in print, autotechnician provides readers with technical, training, business advice, product and news, allowing our readers to keep up to date with information they need to run and work within a modern workshop.
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