June 2020

JUNE 2020 AFTERMARKET 33 www.aftermarketonline.net be paid to the side impact. ZF Aftermarket provides a side impact tester for this purpose. If the limit value of 0.5 millimeters is exceeded, the mechatronics engineer should eliminate the lateral runout of the clutch disc with the help of a straightening fork. “Apart from the clutch itself, damage can also occur on the actuator. These components can only be replaced in their entirety, but this requires little effort. There is only an electrical connection to the vehicle. For some models the workshop has to adjust the preload of the actuator by spring balance. For other vehicles, the workshop must first learn how to use the diagnostic device, whereby the transmission control unit determines the grinding point of the clutch.” Emissions reductions New transmission systems are helping with emissions reduction. Dayco National Sales Manager Steve Carolan observed: “VMs are under enormous pressure to reduce exhaust emissions and increase fuel efficiency of the engines that power their vehicles, which means they need to push the technological boundaries in order to achieve the gains they need. “Dayco pioneered the belt-in-oil (BIO) concept for automotive applications and also designed, developed and co-patented with BMW, both the single-arm torsion bar tensioner for the auxiliary drive system and the motorised friction pulley for the cooling system on the BMW/PSA 1.6-litre turbo petrol unit used in such vehicles as the MINI and Peugeot RCZ. “BIO technology has brought in a true revolution in synchronous transmission systems because developing a solution that enables a drive belt to work inside the confines of the engine has meant that the best of belt and chain technologies have been brought together. “As a result, the previous advantages associated with a chain driven system over an external belt system in terms of the size of the engine, have been mitigated and the more evident advantages of a belt transmission have been maintained. These benefits translate into the ability to reduce the weight of the transmission system and therefore reduce its inertia, which combined with the lower friction properties of a flexible belt, delivers the twin environmental benefits of lower fuel consumption and reduced emissions. The technology also produces noticeably lower noise levels than a comparable chain driven system.” Steve added: “Ford’s EcoBoost family of turbocharged, direct injection petrol engines are designed to deliver levels of power and torque normally associated with larger capacity engines, while at the same time achieving 20 per cent better fuel efficiency and 15 per cent lower emissions. Integral to the EcoBoost design is the BIO timing drive system.” Turning to the BMW-PSA 1.6-litre turbo petrol unit, Steve said: “The system that controls the water pump is activated only when the temperature of the engine needs to be controlled. Dayco designed, developed and manufactures for OE fitment, both the unique single-arm torsion bar tensioner, which replaces the traditional spiral spring tensioner on the auxiliary drive system and the motorised ‘switchable’ friction pulley that actuates the water pump. Steve concluded: “Due to the confined space around these components, a traditional auxiliary belt tensioner could not be employed, which therefore required Dayco to design another innovative solution, this time in the form of the single- arm torsion bar tensioner for the auxiliary drive system.” MEYLE: Advice on automatic gearbox oil change “Though debunked long ago,” said MEYLE UK Sales Director Andrew Tress, “the idea that automatic transmissions don’t require an oil change has proven quite persistent. Transmission oil undergoes a natural ageing process, with the oil wearing out and additives diminishing over time. That makes it all the more important to change the oil. This prevents damage to the transmission and maintains transmission function and driving comfort.” 1. Before you change the oil, read manufacturer’s instructions and check transmission oil specifications 2. Scan and back up fault memory using the diagnostic interface to identify any existing damage 3. Lift the vehicle as horizontally as possible on the lift so you can accurately measure the oil level 4. Check external mechatronic plug-in connector for leaks: If necessary, replace the plug casing and seal, tighten it with the prescribed torque, or check that the plug catch is positioned correctly 5. Always replace the sump screw, as once-off stress bolts are often used 6. Empty the torque converter by turning to the right position. With some gearboxes you have to remove the additional oil pump to get to the torque converter’s outlet screw 7. Fill the torque converter: Run the engine at raised revs of between around 1,500 and 2,000 rpm, under no load, in neutral, for 20 seconds to fill the torque converter. The same applies to a gearbox that does not have an outlet screw on its torque converter 8. Once transmission oil has reached the prescribed temperature, measure the oil level 9. Reset adaption values: With some vehicles, the manufacturer stipulates transmission adaption after changing the oil, which is done on a suitable test bed or while driving, using the menus on the diagnostic device. Andrew added: “MEYLE offers over 60 oil change kits, which come with all the components required for an oil change: filters, seals, screws, drain/intake plugs, magnets and the amount of transmission oil the application calls for.” For information on which oil for which gearbox and at what intervals apply, MEYLE offers a compact poster to download at www.meyle.com/oilchangekits . Below: BIO timing belt kit from Dayco

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