October 2021

OCTOBER 2021 AFTERMARKET 43 www.aftermarketonline.net “Ensure the engine is cool, ideally not run for at least four hours. The working area air temperature should be around 20 º C, the same as the parts to be installed. Disconnect the battery, and if needed, remove the spark plugs. Only rotate the engine in its normal operating direction. Then, ensure 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.” Steve added: “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 think is best, just follow the directive, which is best.” For more information visit: www.dayco.com Installation Meanwhile, the Schaeffler REPXPERT team has produced two new INA technical videos to highlight the correct processes needed to accurately install the timing belt tensioner on popular TDI engines used in multiple VAG applications. Schaeffler REPXPERT Tim Adams observed: “One of the most common causes of premature belt system failure on Follow us at: facebook.com/ aftermarketmagazine Left: INA stud tool Right: Dayco HK Belt 1.9 and 2.0 TDI engines is the incorrect replacement of the tensioner stud. The stud is steel, whilst the cylinder head to which it attaches is alloy, which can create issues. Extreme care needs to be taken to ensure there is no damage to the stud hole or thread, and any aluminium deposits are removed so that the stud can be fully inserted. If the stud extends too far from the block, it can act in a similar way to when you twang a ruler on the side of a desk – the more it protrudes the more vibration is created. Also, if the stud is not installed absolutely square to the engine block, the tensioner will be misaligned, causing excess friction, vibration and premature failure. “The tensioner stud replacement video shows how both the installation angle and depth of the stud can be easily checked by using the INA stud tool available from the REPXPERT bonus shop. Technicians using the tool to confirm the accuracy of the stud installation can then move on to the tensioner itself, which also needs to be fitted with extreme care. “The tensioner setup video highlights the fact that there are two interchangeable tensioners originally fitted by VAG to 2.0 TDI engines, but that the installation procedure is slightly different depending on the manufacturer – Litens or INA. Currently, some data providers are only showing the setup procedure for the OE Litens unit, but as both of the popular INA timing belt kit options listed for the engine obviously contain an OE INA tensioner, following the correct INA setup instructions is critical.” Tim concluded: “The video demonstrates clearly and in detail, the procedure and specifications that must be followed when fitting the OE INA tensioner which, when combined with an accurate stud installation, will ensure a professional and reliable replacement of the entire timing belt system.” For more Information on Schaeffler products and systems, fitting instructions, labour times, visit the REPXPERT workshop portal at www.repxpert.co.uk The basic principle is to simply follow the VM’s instructions, without just-in- case additions ” Left: Dayco BSG 48 V system for mild hybrid vehicle applications