Dayco, a leading engine products and drive systems supplier for the automotive, industrial and aftermarket industries, supplies a number of important, original equipment (OE) components, to vehicle manufacturers (VMs) across Europe and beyond.

Furthermore, as an established power transmission system expert, it is a preferred partner for many VMs and its considerable expertise has enabled it to develop highly efficient solutions for their many and varied needs, particularly as they endeavour to meet the emissions targets demanded by governments around the world.

Among these many product developments is the Dayco High Tenacity (HT) or ‘white’ belt, which, with its PTFE film on its inner teeth and fibreglass core, has become the mainstay timing belt for many engine variants used for multiple applications by numerous VMs.

Just as the constant evolution of engine design led to the development of new materials that are able to guarantee higher performance levels, like those used in the manufacture of Dayco HT belts, further advances have raised the bar still higher.

Dayco HK belts, originally designed for the requirements of specific Peugeot/Citroën applications, encompass the highest level of technological development and feature a tooth lining fabric and weave that incorporates aramid fibres. This combination achieves extremely high wear performance and greater adaptability to tooth geometry, which makes them particularly effective for high-stress transmission systems.

Other notable solutions include the belt-in-oil (BIO), a technology that Dayco originally developed to drive the high pressure fuel injection pump for Ford’s 1.8-litre ‘Lynx’ engine, but which has subsequently been used in several other application, where space is of particular concern, the company has produced a double-sided timing belt.

Another innovative development is the Dayco belt-start generator (BSG) 48 V, a stop/start hybrid engine system designed to enable torque to be transmitted in different directions. The BSG is an unorthodox alternator system that, as well as charging the battery when needed, provides engine starting and braking energy regeneration through the alternator, via the auxiliary belt.

The Dayco Poly-V belt for this system, which has a white, high-strength fabric coating the rib side, is particularly durable and designed to operate in winter temperatures of minus 40 °C and then be subjected up to 90 °C within the engine department.

Technical Tips

There are numerous tips that Dayco recommends technicians bear in mind to promote best practice when replacing primary and auxiliary drive components, amongst others, these include:

  • ensure the engine is cool, ideally not run for at least four hours
  • the working area air temperature should be around 20 °C, the same as the parts to be installed
  • disconnect the battery
  • if needed, remove the spark plugs
  • only rotate the engine in its normal operating direction
  • ensuring that replacement belts are treated with respect and not handled with greasy hands, crimped or otherwise damaged before installation
  • when fitting a replacement water pump, sealing compound should only be used when the gasket is not included, otherwise just wet the mating surfaces and the supplied gasket with coolant
  • as Dayco kits contain all the components that VMs state must be changed in accordance with the specific service procedure, technicians must fit all the components supplied in the relevant Dayco timing or auxiliary belt kit, during the replacement process
  • specific torque sequences and values must be followed

In short, the basic principle for technicians is to simply follow the VM’s instructions, without adding ‘just in case’ additions like lots of sealer or thread adhesive etc. In other words, don’t improvise and fit it the way they thinkis best, just follow the directive, which is best.

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