Inside Line: Dayco

Primary (timing) Drive System

Many of the engines used across the Ulysse/C8/807 range are fitted with a Dayco High Tenacity (HT), or ‘white’, timing belt as its original equipment (OE) fitment. Most of the units also feature a water pump that is integrated into the timing drive system and driven by the timing belt.

Dayco recommend technicians follow industry best practice and ensure that they replace the water pump when the timing belt is being replaced and vice versa. Both of these components cover the same mileages, so replacing both at the same time is the most cost effective option in the long-term and provides motorists with much needed peace of mind following a vehicle repair.

FEAD (front end auxiliary drive) System

Despite being subject to inevitable wear and tear during the lifespan of the engine, the FEAD system has not traditionally been subject to any particular maintenance or replacement schedule. However, Dayco believe it is important for technicians to regularly examine all the components within the FEAD system.

Although it may not directly be a safety critical component, the auxiliary belt in these vehicles drives so many vital components – alternator, power steering pump, air conditioning compressor etc. – and even if its failure does not directly stop the vehicle, it could certainly leave the driver without power to some parts of the vehicle that could make it in effect, un-driveable.

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